CDM Smith

 NetSTORM Point Precipitation Frequency Estimates

NetSTORM
Annual Statistics  |  Event Listings  |  Frequency Estimates

Gage ID: 14739
Location: BOSTON, MA
Latitude: 42.3606°, Longitude: -71.0097°
Elevation: 12.1 ft
Additional metadata


Monthly Statistics
MonthTotalRecordsMeanStandard DeviationMaximumDuration
Jan 3.4374.130.0460.0540.65017.64
Feb 3.2367.690.0480.0540.66018.18
March3.7575.210.0500.0570.68018.17
April3.6667.870.0540.0620.91017.85
May 3.1957.090.0560.0730.98017.84
June 3.3146.850.0710.1081.54015.28
July 3.1236.600.0850.1401.61011.52
Aug 3.3039.430.0840.1412.03011.33
Sep 3.2641.870.0780.1171.58014.69
Oct 3.3551.070.0660.0891.53016.46
Nov 3.7263.890.0580.0740.97018.25
Dec 3.7371.610.0520.0610.81017.24

Hour of Day Statistics
HourJan Feb MarchAprilMay June July Aug Sep Oct Nov Dec TotalRecordsMeanStandard DeviationMaximum
1:000.150.150.160.170.160.120.090.130.120.170.170.171.7528.920.0600.0820.96
2:000.140.140.180.150.150.120.130.130.130.170.170.161.7629.500.0600.0832.03
3:000.150.140.180.170.140.140.130.130.160.180.170.161.8430.680.0600.0831.35
4:000.140.130.170.180.140.130.130.110.170.170.170.161.8130.800.0590.0821.58
5:000.150.130.170.170.140.130.140.120.160.140.180.161.7930.340.0590.0811.17
6:000.150.130.170.150.140.120.150.130.140.140.190.151.7730.530.0580.0801.11
7:000.150.140.170.140.140.130.140.140.160.130.170.171.7830.600.0580.0841.61
8:000.150.140.160.130.130.140.120.160.140.120.140.161.6829.310.0570.0851.56
9:000.140.140.150.130.110.140.120.160.130.120.160.141.6428.240.0580.0821.41
10:000.140.150.160.120.130.120.090.130.140.130.160.141.6128.240.0570.0771.10
11:000.160.150.150.130.130.100.090.120.120.110.150.151.5726.980.0580.0761.10
12:000.160.140.140.130.120.110.120.140.120.140.180.151.6427.540.0600.0821.22
13:000.150.140.140.140.110.120.100.140.160.130.160.151.6427.310.0600.0901.54
14:000.140.130.140.160.100.180.130.160.160.140.130.151.7227.050.0640.0971.63
15:000.130.140.130.150.110.150.170.210.150.130.120.141.7427.140.0640.1031.55
16:000.140.140.150.160.120.200.170.180.130.130.130.141.7928.450.0630.0981.60
17:000.130.130.150.160.140.200.250.170.110.140.130.151.8529.420.0630.0991.34
18:000.130.120.140.160.130.180.180.140.120.120.150.171.7429.180.0600.0841.05
19:000.140.120.160.160.140.120.160.140.120.130.160.171.7229.650.0580.0821.45
20:000.140.120.160.150.140.130.140.130.120.130.150.161.6728.620.0580.0821.09
21:000.130.120.150.160.140.140.120.110.120.120.140.151.6028.120.0570.0760.80
22:000.140.140.150.140.120.150.090.090.140.150.150.161.6128.910.0560.0791.53
23:000.140.140.150.160.150.130.090.110.130.150.150.151.6428.700.0570.0801.38
24:000.150.130.150.180.140.120.080.120.120.160.170.171.6929.090.0580.0781.24


Day of Week Statistics
WeekdayTotalRecordsMeanStandard DeviationMaximumDuration
Sun5.9197.910.0600.0861.6016.12
Mon5.7398.960.0580.0791.6115.71
Tue5.86101.500.0580.0831.6316.34
Wed5.7998.940.0590.0821.3317.17
Thu5.8896.060.0610.0882.0316.09
Fri5.97100.630.0590.0851.5516.36
Sat5.9199.330.0590.0881.5416.54
YearTotalRecordsMeanStandard
Deviation
MaximumDuration
(h)
Interevent
(h)
≥.00≥.10≥.25≥.50≥.75≥1.00≥2.00
189436.286610.0550.0801.0716.371938755372617121
189540.116020.0670.0970.9312.932159163402418133
189637.347810.0480.0560.5717.27172915845291692
189740.086350.0630.0830.6711.4117310065462915122
189849.668420.0590.0730.9114.581389474573020154
189934.616060.0570.0901.2215.712138348382617111
190043.976180.0710.0800.6015.951948755402416155
190148.606690.0730.0951.2415.402179060392923155
190233.766040.0560.0670.7314.271999056402619111
190341.247280.0570.0740.6519.071608964412819113
190439.626890.0580.0790.8513.091901036441221362
190532.176120.0530.0841.0017.88250795233241671
190640.696370.0640.0981.5313.9521210062392818122
190737.566550.0570.0780.6815.001899458432316122
190830.045080.0590.0921.5512.27218805735221070
190939.376540.0600.0710.5116.211938255412216103
191028.325580.0510.0600.6515.59216935238191080
191135.776550.0550.0790.9515.922138658372617101
191234.556110.0570.0821.3413.952038655412616111
191338.016790.0560.0760.9117.56184826141282082
191434.276510.0530.0620.5116.772067650382420122
191538.765900.0660.1091.1716.11238794935221494
191637.367850.0480.0711.2717.951991006338291593
191738.996580.0590.0941.2415.322109355382316131
191833.566210.0540.0770.8715.002509657312115122
191942.417530.0560.0760.6617.381838960423022122
192046.137860.0590.0710.5618.261988858423022155
192142.046590.0640.1181.4517.491979152412314104
192241.126240.0660.0890.9217.852027253382115114
192334.726260.0550.0670.5411.83184846245201392
192436.995360.0690.1010.8213.30193795739221682
192540.176430.0620.0830.7013.061598562522617101
192639.285720.0690.1060.9411.611908555442416103
192740.906490.0630.0940.9913.081641006648332290
192838.356360.0600.0890.8913.591758857432915112
192937.156770.0550.0730.7913.571848658462615111
193034.876170.0570.0810.8716.891917950362216102
193143.456950.0630.0810.6119.951998152372822143
193241.616320.0660.0910.7516.392208851352514114
193346.207780.0590.0910.9018.172069555382820113
193434.716280.0550.0790.9113.55205956340281362
193532.946020.0550.0720.6817.322388244342015112
193647.057230.0650.0840.9114.4717510057452923203
193743.376820.0640.0870.8116.331699061482618125
193850.528520.0590.0951.3819.0717310263462419154
193932.426370.0510.0600.3815.1020688544025982
194036.087450.0480.0620.6420.342449949311916131
194130.885660.0550.0750.9715.462267849372213111
194242.477290.0580.0850.8513.801718655452719161
194332.236210.0520.0750.7417.51192995238221363
194437.066500.0570.0960.8519.112257646372615113
194547.288810.0540.0760.9718.3315410770493124123
194638.086180.0620.0851.0915.322108455382216123
194737.905760.0660.1031.3118.222207248372421132
194840.387710.0520.0730.9618.22159916648322192
194931.566040.0520.0881.5812.67187896041241042
195032.717000.0470.0700.6718.252369458361612101
195146.978110.0580.0760.7415.3115210267513224172
195240.607490.0540.0921.6317.621909556422617133
195357.738370.0690.0880.6618.091649058473427218
195462.328750.0710.1161.2219.1016710965473126186
195556.507260.0780.1531.6017.001779757423022175
195647.398820.0540.0770.9518.5517310262493621114
195733.926390.0530.0680.5717.59217835336221373
195861.639610.0640.0870.9718.2413410464543929228
195951.418570.0600.0931.0718.7716810067483525163
196044.466660.0670.1021.5416.931928654423121175
196147.847510.0640.0850.9516.511728960453122174
196243.237340.0590.0760.7517.922169355372416105
196334.846570.0530.0670.7214.86190866040261372
196436.476770.0540.0750.8218.452119150362415120
196523.715900.0400.0470.4217.3825190453017761
196636.016480.0560.0750.9016.082289452372619110
196747.518100.0590.0891.5616.581619467482620174
196842.266810.0620.0700.4815.952098553393020152
196947.897200.0670.0780.5019.171998455402719155
197041.917330.0570.0740.9516.451908960422815134
197135.677040.0510.0660.5415.47188876040251691
197253.099210.0580.0780.8516.0414611373533924154
197342.767480.0570.0820.9715.211529661513116112
197440.346520.0620.0910.8813.38168976245261793
197545.808580.0530.0630.5719.361809058432719135
197636.726470.0570.0890.9313.91173926045231292
197744.178220.0540.0630.4417.421759465432822162
197837.646680.0560.0751.0017.832018149382316114
197944.177790.0570.0841.0819.281809258412622155
198029.475120.0580.0790.7012.37241895235181190
198135.716790.0530.0650.8020.57223865535211582
198244.617160.0620.0830.9017.121908755382919133
198353.607790.0690.0790.6016.601659661473424185
198450.097440.0670.0860.6616.931789156442922154
198536.586960.0530.1062.0316.49174985844251482
198644.336820.0650.0810.6617.312149057392721134
198745.487490.0610.0790.7519.302028251392921135
198834.785880.0590.0820.7313.08221965537211593
198942.427810.0540.0730.7017.041579666452921131
199046.507110.0650.0990.9317.862019157442920146
199142.256800.0620.0850.7218.311978254382618145
199243.727330.0600.0920.9717.041789559472315104
199343.217540.0570.0760.6314.7918410059433321142
199447.608060.0590.0870.8418.631539760432924164
199535.126620.0530.0780.6616.931989552402418113
199649.437440.0660.0860.7315.591599561513016133
199730.256190.0490.0600.5816.0923595493521962
199853.206900.0770.1171.3417.161738358422819157
199937.835840.0650.1051.3114.88188855241251592
200044.526760.0660.0900.7216.511738659463517103
200129.645220.0570.0890.9814.09219814932201062
200239.927320.0550.0690.9117.841819262443318122
200340.787060.0580.0880.9615.6520310164402921130
200443.556460.0670.0960.7419.892118751372820124
200541.197140.0580.0700.5717.411839263442716102
200651.897630.0680.0830.5818.221729164452620136
200738.966530.0600.1021.6115.902109056372617113
200853.107560.0700.1010.9814.211379973573322155
200942.327340.0580.0740.7415.741599268493320122
201047.146720.0700.1121.5118.582158747352317135
201150.137650.0660.0840.8118.041599866513627202
201236.736260.0590.0991.3317.652239052372917111
201337.096430.0580.0800.7516.561959653401913112
201444.867490.0600.0760.8017.961559362503221124
201534.766570.0530.0730.5017.002169152382518122
201632.605980.0550.0690.6814.431899555352018120
201741.207650.0540.0790.6920.051959661392819132
201849.477740.0640.0981.1215.1914910571534122191
201946.927820.0600.1001.4113.1616010976493022151
202036.296300.0580.0861.2315.241998956402715100
Mean41.04693.320.060.080.9016.33188.5690.957.841.626.717.711.92.7
Longest drought = 36 days preceding 04/03/1915
Period of record = 127.00 years
Period missing = 0.00 years
Records = 88052
Mean = 0.059
Mean event depth = 0.873 (≥.25 inches)
Annual event depth = 37.1 (≥.25 inches)
Mean event duration = 17.33 hours
Interevent coefficient of variation = 0.87 (excluding periods exceeding 50 dry days)
Interevent time = 12 hours
ARI: Average recurrence interval


RankDepthDateEvent IDHoursRecordsMaximumARI (y)
111.948/18/1955 6:00257140.00361.41179.16
28.865/12/2006 20:00474695.00770.4360.63
37.8910/20/1996 4:00435533.00310.7339.35
47.869/15/1933 24:00164542.00410.9038.79
57.0110/5/1962 8:00289461.00550.5925.14
66.983/13/2010 11:00493158.00580.4324.73
76.776/4/1982 17:00373283.00770.3622.01
86.776/12/1998 16:00442143.00321.3422.01
96.047/9/1921 2:00111822.00141.4514.16
106.033/31/2004 11:00465444.00410.5314.07
116.005/30/1984 17:00382576.00560.4313.80
125.9110/17/1932 16:00160766.00570.6113.01
135.745/15/1954 20:00251618.00180.9811.61
145.7312/11/1992 4:00418253.00410.4911.53
155.7210/12/1895 15:006939.00390.6411.45
165.649/10/1954 19:00253123.00181.2210.84
175.477/21/1938 6:00185280.00460.789.61
185.407/1/1915 3:0088350.00341.179.14
195.356/5/1986 13:00390662.00460.548.81
205.224/27/1904 3:0044872.00500.378.00
215.176/8/1931 15:00156070.00460.347.70
225.141/8/1956 16:002589161.001110.407.53
235.144/4/1987 9:00394382.00650.307.53
245.103/17/1968 15:00311140.00370.387.30
254.989/12/1944 19:00208855.00350.746.65
264.933/29/2010 3:00493353.00490.336.39
274.766/29/1921 19:00111769.00440.565.57
284.719/10/1999 8:00447317.00171.315.34
294.689/2/1905 23:0049938.00340.915.21
304.637/31/1985 14:00387214.00132.035.00
314.5912/26/1969 1:00318151.00390.414.83
324.488/22/2010 10:00494779.00531.094.39
334.378/25/1924 23:00124917.00170.783.99
344.3510/8/1998 13:00443782.00580.603.92
354.279/9/1924 22:00125315.00150.823.65
364.246/6/2000 8:00450627.00240.593.55
374.1610/13/2005 22:00472144.00360.343.31
384.156/18/1922 6:00115641.00270.333.28
394.1411/21/1992 15:004179100.00460.973.25
404.125/4/1922 7:00115238.00380.263.19
414.116/26/1938 10:00184864.00550.263.16
424.068/9/1917 5:0096630.00161.243.02
433.995/25/1967 5:00307541.00350.352.83
443.989/16/1958 18:00271541.00380.412.80
453.939/17/1938 18:00185880.00490.842.67
463.9110/13/1990 9:00408923.00180.932.62
473.8912/9/2008 21:00487062.00560.502.57
483.878/11/1989 6:00403862.00430.432.53
493.854/16/1954 12:00251042.00400.362.48
503.8111/9/1969 10:00317454.00390.352.39


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
12.038/1/1985 2:0038726429
21.638/5/1952 14:0024392211
31.617/30/2007 7:0047992010
41.607/10/1955 16:0025672010
51.589/1/1949 4:002306189
61.568/6/1967 8:003085179
71.558/7/1908 15:00616179
81.546/4/1960 13:002800168
91.5310/9/1906 22:00536168
101.517/10/2010 15:004943158
111.457/9/1921 19:001118127
121.416/29/2019 16:005335106
131.418/19/1955 9:002571106
141.388/16/1938 23:00185496
151.347/18/1912 17:0076685
161.346/13/1998 14:00442185
171.337/18/2012 17:00502985
181.319/2/1947 13:00221875
191.319/10/1999 23:00447375
201.277/3/1916 17:0092364
211.248/24/1901 24:0033554
221.248/10/1917 7:0096654
231.238/23/2020 17:00538354
241.229/11/1954 12:00253154
251.228/22/1899 19:0025654
261.217/28/2007 16:00479854
271.177/1/1915 5:0088343
281.127/17/2018 17:00527833
291.098/25/2010 10:00494732
301.097/30/1946 20:00217732
311.0810/3/1979 17:00363332
321.077/19/1959 20:00276032
331.078/21/1894 13:002532
341.067/31/2019 15:00534032
351.058/31/1954 10:00252922
361.056/13/1959 18:00275122
371.047/2/1955 19:00256622
381.039/12/1960 15:00280922
391.008/12/1905 13:0049622
401.008/6/1978 9:00358122
410.9910/13/1927 12:00139922
420.987/20/2008 15:00484822
430.985/16/1954 5:00251622
440.989/6/1979 13:00362922
450.988/3/2001 20:00455422
460.977/29/1973 16:00335322
470.9711/23/1992 3:00417922
480.976/29/1941 18:00196022
490.976/20/1945 6:00212822
500.978/13/1958 4:00270922


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
12.858/1/1985 2:0038729037
22.518/19/1955 9:0025714620
32.357/9/1921 2:0011183315
42.287/1/1915 5:008832813
52.258/6/1967 7:0030852612
62.217/10/1955 15:0025672412
72.019/10/1999 22:004473148
81.988/10/1917 6:00966137
91.928/24/1901 24:00335117
101.905/16/1954 4:002516116
111.897/28/2007 16:004798106
121.889/11/1954 12:002531106
131.839/1/1949 3:00230696
141.826/13/1998 14:00442195
151.828/21/1894 13:002595
161.808/5/1952 14:00243985
171.788/25/2010 9:00494785
181.787/30/1926 5:00134485
191.7310/9/1906 22:0053675
201.709/15/1904 7:0046664
211.687/18/1912 17:0076664
221.678/7/1908 14:0061664
231.678/16/1938 23:00185464
241.677/30/2007 6:00479964
251.667/24/1926 8:00134354
261.657/10/2010 14:00494354
271.628/18/1994 5:00425754
281.629/12/1960 14:00280954
291.579/16/1933 8:00164543
301.556/4/1960 13:00280043
311.546/19/1942 23:00199943
321.538/3/2001 19:00455443
331.537/3/1916 17:0092343
341.518/4/1915 15:0088733
351.507/18/2012 17:00502933
361.507/28/1911 12:0072233
371.487/21/1938 17:00185233
381.489/2/1947 12:00221833
391.4712/6/1937 23:00181833
401.4410/13/1927 11:00139933
411.448/31/1954 9:00252933
421.4311/12/1947 12:00222332
431.4310/14/1990 1:00408932
441.439/25/1961 14:00285532
451.436/29/2019 16:00533532
461.418/26/1924 10:00124932
471.386/13/1959 18:00275122
481.388/22/1899 19:0025622
491.356/12/1955 9:00256422
501.349/13/1918 5:00100222


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
13.618/19/1955 9:0025719456
23.588/1/1985 1:0038729053
33.026/13/1998 14:0044214222
42.927/1/1915 5:008833619
52.638/10/1917 6:009662312
62.587/9/1921 19:0011182111
72.508/6/1967 7:0030851810
82.499/11/1954 11:0025311810
92.499/10/1999 21:0044731810
102.405/16/1954 4:002516158
112.387/10/1955 15:002567148
122.229/16/1933 7:001645106
132.207/30/1926 5:001344106
142.187/24/1926 8:001343106
152.167/28/2007 15:00479896
162.168/25/2010 8:00494796
172.038/21/1894 13:002575
182.038/26/1924 10:00124975
192.039/1/1949 3:00230675
202.019/15/1904 6:0046674
211.9610/14/1990 1:00408964
221.958/18/1994 5:00425764
231.948/24/1901 24:0033564
241.939/12/1960 14:00280954
251.929/20/1899 8:0025854
261.899/10/1924 2:00125354
271.897/28/1911 12:0072254
281.8910/9/1906 22:0053654
291.8511/23/1992 3:00417943
301.858/4/1915 15:0088743
311.8210/20/1996 6:00435543
321.816/19/1942 23:00199943
331.818/5/1952 13:00243943
341.807/21/1938 16:00185243
351.7710/31/1895 24:007043
361.769/13/1918 5:00100243
371.7512/6/1937 22:00181833
381.757/17/2018 15:00527833
391.738/7/1908 14:0061633
401.728/16/1938 23:00185433
411.728/31/1954 9:00252933
421.727/30/2007 6:00479933
431.7010/15/1930 6:00152733
441.707/3/1916 16:0092333
451.697/18/1912 16:0076633
461.659/17/1995 15:00429632
471.657/10/2010 14:00494332
481.647/11/1959 5:00275832
491.636/4/1960 13:00280032
501.607/24/1988 5:00399322


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
15.468/19/1955 6:002571131135
24.189/11/1954 10:0025315132
34.157/31/1985 22:0038725031
44.035/16/1954 1:0025164526
53.716/13/1998 14:0044213318
63.629/10/1999 18:0044733016
73.539/16/1933 5:0016452715
83.377/1/1915 3:008832212
93.3310/14/1990 1:0040892111
103.248/26/1924 9:0012491910
113.1011/23/1992 3:004179168
123.0510/20/1996 6:004355158
133.059/10/1924 2:001253158
142.938/10/1917 5:00966127
152.799/15/1904 3:00466106
162.767/28/1911 10:00722106
172.7012/6/1937 19:00181895
182.667/9/1921 19:00111885
192.617/17/2018 14:00527875
202.608/6/1967 6:00308574
212.578/25/2010 6:00494774
222.579/20/1899 6:0025874
232.4910/31/1895 22:007064
242.397/10/1955 15:00256753
252.399/17/1995 13:00429653
262.379/14/1944 20:00208853
272.3710/13/1895 15:006953
282.348/5/1952 14:00243943
292.339/16/1932 9:00160543
302.319/12/1960 12:00280943
312.307/30/1926 4:00134443
322.309/13/1918 3:00100243
332.297/24/1926 6:00134343
342.257/11/1959 2:00275843
352.258/18/1994 3:00425743
362.259/2/1947 9:00221843
372.197/24/1988 3:00399333
382.176/20/1945 2:00212832
392.179/3/1972 9:00330232
402.167/28/2007 15:00479832
412.148/4/1915 12:0088732
422.119/1/1949 1:00230632
432.118/24/1990 22:00408532
442.107/18/1912 17:0076632
452.098/21/1894 13:002522
462.097/30/1976 8:00349222
472.098/11/1990 11:00408222
482.076/16/2017 16:00523422
492.077/21/1938 13:00185222
502.078/24/1901 21:0033522


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
16.748/19/1955 5:002571134132
25.545/15/1954 21:0025166845
35.449/11/1954 5:0025316341
45.019/16/1933 2:0016454726
54.9410/20/1996 5:0043554424
64.816/13/1998 7:0044214021
74.379/10/1999 13:0044732714
84.307/31/1985 16:0038722613
94.119/9/1924 22:0012532111
103.978/26/1924 3:001249189
113.857/1/1915 3:00883168
123.6310/13/1990 18:004089126
133.596/6/2000 12:004506126
143.489/14/1904 24:00466105
153.467/28/1911 6:00722105
163.4311/22/1992 22:00417995
173.387/9/1921 2:00111895
183.2410/13/1895 9:006974
193.2312/12/1992 2:00418274
203.164/1/2004 13:00465464
213.1310/5/1995 19:00429964
223.085/31/1984 7:00382564
233.016/9/1931 16:00156053
243.019/3/1972 5:00330253
253.0010/5/1962 20:00289453
262.978/10/1917 3:0096653
272.924/21/1991 4:00411343
282.923/31/1934 18:00166543
292.9112/6/1937 16:00181843
302.9110/15/1930 5:00152743
312.869/16/1932 8:00160543
322.869/18/2004 3:00467643
332.8511/12/1947 5:00222343
342.8412/11/2008 21:00487043
352.829/20/1899 5:0025843
362.8210/31/1895 18:007043
372.819/12/1960 5:00280933
382.8010/2/1984 1:00383733
392.796/7/2013 15:00506633
402.783/29/1953 21:00246533
412.775/8/1954 21:00251433
422.779/16/1999 10:00447433
432.769/17/1995 7:00429632
442.758/25/2010 2:00494732
452.737/17/2018 14:00527832
462.728/11/1990 7:00408232
472.704/30/1921 21:00111332
482.695/14/2006 5:00474632
492.699/2/1947 8:00221832
502.6812/9/2014 8:00513832


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
18.358/18/1955 13:002571148134
26.6510/20/1996 5:0043556139
36.047/9/1921 2:0011184124
45.826/13/1998 8:0044213520
55.745/15/1954 20:0025163319
65.649/10/1954 19:0025313117
75.639/16/1933 1:0016453117
85.1412/11/1992 16:0041822112
94.9610/12/1895 22:00691810
104.735/13/2006 10:004746148
114.719/10/1999 8:004473148
124.637/31/1985 14:003872138
134.467/1/1915 3:00883117
144.378/25/1924 23:001249106
154.294/1/2004 1:00465496
164.279/9/1924 22:00125396
174.2610/5/1962 11:00289496
184.259/3/1905 5:0049996
194.196/9/1931 8:00156085
204.186/6/2000 9:00450685
214.175/31/1984 2:00382585
224.1712/26/1969 6:00318185
234.133/17/1968 22:00311185
244.036/5/1986 21:00390675
253.9110/13/1990 9:00408964
263.7611/22/1992 12:00417954
273.6910/14/2005 18:00472153
283.696/18/1922 23:00115653
293.6710/1/1984 14:00383753
303.6510/18/1932 12:00160743
313.645/25/1967 10:00307543
323.623/29/2010 15:00493343
333.608/9/1917 9:0096643
343.586/7/2013 7:00506643
353.579/14/1904 12:0046643
363.545/8/1954 12:00251443
373.533/13/2010 22:00493143
383.497/28/1911 5:0072243
393.408/24/2010 12:00494733
403.3410/15/1930 5:00152732
413.3212/11/2008 9:00487032
423.3211/11/1947 19:00222332
433.324/21/1991 1:00411332
443.315/21/1920 20:00107732
453.3111/4/1955 7:00258332
463.3110/5/1995 14:00429932
473.319/18/1936 10:00176132
483.309/15/1999 22:00447432
493.255/4/1922 12:00115232
503.236/4/1982 21:00373222


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
111.948/18/1955 6:002571200278
27.8910/20/1996 4:0043554836
37.869/15/1933 24:0016454735
47.795/12/2006 23:0047464634
56.776/12/1998 16:0044212718
66.7410/5/1962 14:0028942717
76.333/13/2010 14:0049312113
86.047/9/1921 2:0011181811
96.033/31/2004 11:0046541811
105.986/4/1982 21:0037321710
115.745/15/1954 20:002516149
125.7212/11/1992 14:004182149
135.7210/12/1895 15:0069149
145.699/10/1954 2:002531149
155.6610/18/1932 8:001607149
165.357/1/1915 3:00883117
175.103/17/1968 15:00311196
185.006/5/1986 13:00390685
194.966/9/1931 3:00156085
204.944/27/1904 11:0044885
214.903/29/2010 3:00493385
224.719/10/1999 8:00447374
234.695/31/1984 2:00382564
244.689/2/1905 23:0049964
254.689/13/1944 1:00208864
264.637/31/1985 14:00387264
274.5412/26/1969 2:00318164
284.378/25/1924 23:00124954
294.354/5/1987 0:00394354
304.289/9/1924 5:00125343
314.246/6/2000 8:00450643
324.1610/13/2005 22:00472143
334.156/18/1922 6:00115643
344.125/4/1922 7:00115243
354.068/9/1917 5:0096643
364.047/21/1938 13:00185233
373.995/25/1967 5:00307533
383.989/16/1958 18:00271533
393.976/29/1921 19:00111733
403.948/19/1991 7:00412433
413.9110/13/1990 9:00408933
423.9011/22/1992 12:00417933
433.887/28/2007 15:00479832
443.854/16/1954 12:00251032
453.7711/9/1969 10:00317432
463.7412/10/2008 11:00487022
473.725/21/1920 18:00107722
483.698/23/2010 13:00494722
493.6811/4/1955 7:00258322
503.683/29/1953 9:00246522


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
112.478/17/1955 13:002570201238
28.345/12/2006 20:0047464932
37.9910/20/1996 4:0043554225
47.889/14/1933 20:0016454024
57.686/13/1998 2:0044213621
67.0110/5/1962 8:0028942615
76.983/13/2010 11:0049312514
86.536/4/1982 21:0037321911
96.047/9/1921 2:001118148
106.033/31/2004 11:004654148
115.995/30/1984 22:003825148
125.9110/17/1932 16:001607137
135.829/9/1954 3:002531127
145.745/15/1954 20:002516127
155.7312/11/1992 4:004182127
165.7210/12/1895 15:0069117
175.437/1/1915 3:0088395
185.356/5/1986 13:00390695
195.277/21/1938 13:00185285
205.224/27/1904 3:0044885
215.176/8/1931 15:00156085
225.113/17/1968 15:00311174
235.024/4/1987 9:00394374
244.999/8/1999 7:00447264
254.989/12/1944 19:00208864
264.933/29/2010 3:00493364
274.9311/22/1953 23:00249064
284.816/18/1922 22:00115664
294.766/29/1921 19:00111754
304.689/2/1905 23:0049953
314.637/31/1985 14:00387253
324.5912/26/1969 1:00318153
334.527/30/1946 20:00217743
344.438/22/2010 13:00494743
354.378/25/1924 23:00124943
364.363/13/1953 6:00246043
374.318/19/1991 1:00412433
384.289/9/1924 5:00125333
394.2410/8/1998 14:00443733
404.246/6/2000 8:00450633
414.1610/13/2005 22:00472132
424.125/4/1922 7:00115232
434.116/26/1938 10:00184832
444.0611/22/1992 12:00417932
454.068/9/1917 5:0096632
464.047/28/2007 2:00479832
473.995/25/1967 5:00307532
483.9810/14/1955 19:00258022
493.989/16/1958 18:00271522
503.968/6/1976 19:00349422


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
112.478/17/1955 13:002570185198
28.865/12/2006 20:0047465834
38.0710/20/1996 4:0043554121
48.066/12/1998 16:0044214121
57.969/14/1933 5:0016453920
67.0110/5/1962 8:0028942412
76.983/13/2010 11:0049312411
86.776/4/1982 17:0037322110
96.265/29/1984 21:003824157
106.063/31/2004 13:004654147
116.047/9/1921 2:001118137
125.9110/17/1932 16:001607126
135.909/7/1954 18:002530126
145.867/20/1938 8:001851126
155.7910/12/1895 15:0069116
165.755/12/1954 18:002516115
175.7312/11/1992 4:004182115
185.447/1/1915 3:0088395
195.394/27/1904 3:0044884
205.366/5/1986 13:00390684
215.319/7/1999 3:00447184
225.306/7/2013 7:00506684
235.246/7/1931 12:00156074
245.206/18/1922 6:00115674
255.173/17/1968 16:00311174
265.144/4/1987 9:00394374
274.989/12/1944 19:00208863
284.933/29/2010 3:00493363
294.9311/22/1953 23:00249063
304.816/29/1921 1:00111753
314.699/2/1905 23:0049943
324.6312/24/1969 6:00318143
334.637/31/1985 14:00387243
344.633/12/1953 22:00246043
354.527/30/1946 20:00217742
364.488/22/2010 10:00494742
374.4611/7/1969 19:00317342
384.378/25/1924 23:00124932
394.3510/8/1998 13:00443732
404.3510/11/2005 16:00472132
414.329/12/1904 1:0046532
424.318/19/1991 1:00412432
434.308/6/1976 19:00349432
444.289/9/1924 5:00125332
454.2511/22/1992 13:00417932
464.246/6/2000 8:00450632
474.243/8/1983 18:00376532
484.2212/5/2014 23:00513732
494.125/4/1922 7:00115222
504.116/26/1938 10:00184822


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
113.528/17/1955 13:002570168201
210.375/9/2006 13:0047456349
38.966/2/1982 2:0037313622
48.456/12/1998 16:0044212817
58.379/10/1999 8:0044732716
68.0710/20/1996 4:0043552313
77.969/14/1933 9:0016452213
87.955/15/1954 20:0025162213
97.753/31/1987 3:0039422011
107.677/18/1938 9:0018511911
117.645/26/1984 20:0038231910
127.526/7/2013 9:0050661710
137.156/9/1931 8:001560148
147.079/10/1954 19:002531138
157.0610/5/1962 8:002894138
167.063/11/2010 11:004931138
176.743/12/1968 18:003110116
186.4012/11/1992 4:00418295
196.307/9/1921 2:00111885
206.293/31/2004 11:00465485
216.1010/8/2005 15:00472074
226.096/5/1986 14:00390674
236.0310/8/1895 12:006874
245.976/1/2006 20:00474964
255.9412/22/1969 6:00318064
265.9110/17/1932 16:00160764
275.909/20/1961 23:00285464
285.667/26/1985 10:00387153
295.639/13/1987 10:00395953
305.627/1/1915 3:0088353
315.4711/4/1969 12:00317243
325.468/5/1952 7:00243943
335.444/25/1904 4:0044843
345.2410/8/1998 13:00443732
355.245/4/1998 22:00441532
365.239/19/1991 13:00412732
375.206/18/1922 6:00115632
385.198/29/1905 4:0049832
395.141/8/1956 16:00258932
405.126/15/1903 9:0040932
415.1210/13/1990 9:00408932
425.111/20/1979 21:00360232
435.113/24/1953 15:00246332
445.103/26/2010 4:00493332
455.0911/7/1968 12:00313332
465.049/22/1907 24:0057332
474.989/12/1944 19:00208832
484.9711/22/1953 23:00249032
494.943/12/1953 22:00246032
504.946/26/1921 9:00111732


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
114.258/17/1955 13:002570143196
210.805/9/2006 13:0047455040
310.576/29/1921 22:0011174635
49.805/29/1982 5:0037303423
59.585/7/1954 2:0025143120
69.539/27/1962 10:0028933020
78.959/7/1999 3:0044712314
88.943/13/2010 12:0049312314
98.486/8/1998 18:0044211911
108.466/7/1931 12:0015601811
118.2810/20/1996 4:0043551710
128.039/9/1933 2:001645159
137.903/31/1987 3:003942148
147.787/18/1938 9:001851137
157.765/23/1984 19:003823137
167.739/7/1954 11:002530127
177.706/7/2013 0:005066127
187.497/1/1915 3:00883116
197.0611/3/1969 2:00317185
206.973/10/1968 18:00311085
216.9110/17/1932 24:00160775
226.6412/3/1992 2:00418164
236.626/5/1986 13:00390664
246.587/11/1959 5:00275864
256.483/26/2004 23:00465454
266.466/1/2006 20:00474953
276.4610/7/2005 23:00472053
286.2212/22/1969 6:00318053
296.216/11/1922 16:00115543
306.143/2/1983 4:00376443
316.1010/8/1895 12:006843
326.028/13/1994 7:00425643
335.987/30/1946 20:00217743
345.965/2/1998 0:00441443
355.9212/10/1936 10:00177042
365.909/20/1961 23:00285442
375.867/17/1988 21:00399032
385.856/12/1903 11:0040832
395.808/1/1952 4:00243832
405.779/13/1987 10:00395932
415.767/22/1985 4:00387032
425.701/8/1956 16:00258932
435.704/19/1904 21:0044732
445.674/12/1929 11:00147232
455.649/11/1960 13:00280932
465.589/1/1924 10:00125032
475.5411/29/1945 2:00214832
485.5211/21/1971 7:00326032
495.5111/28/1937 5:00181732
505.453/23/2010 12:00493222


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
116.818/11/1955 17:002569128193
214.483/11/2010 11:0049316872
312.865/3/1954 9:0025134032
412.215/1/2006 22:0047443223
512.046/2/1982 2:0037313021
611.488/28/1933 17:0016422416
711.246/26/1921 9:0011172215
810.926/12/1998 16:0044211912
910.869/17/1962 19:0028921812
1010.598/31/1954 0:0025291610
1110.5811/23/1992 2:0041791610
1210.5010/8/1996 17:0043541610
1310.093/12/1953 22:002460138
149.958/25/1924 23:001249128
159.855/29/2013 22:005064117
169.4012/8/1969 4:00317796
179.369/6/1999 12:00447195
189.153/31/1987 3:00394285
199.117/10/1938 2:00185085
209.001/6/1979 4:00360075
218.9510/7/2005 23:00472074
228.906/7/1931 12:00156074
238.899/8/1918 16:00100174
248.863/26/2004 23:00465474
258.809/15/1961 1:00285374
268.7310/18/1932 10:00160764
278.713/1/1983 20:00376464
288.6210/12/1895 15:006964
298.297/30/1946 20:00217753
308.245/13/1984 22:00382353
318.1211/3/1969 1:00317143
328.127/2/1959 0:00275643
338.0911/23/1953 3:00249043
348.0710/27/2018 11:00529443
358.067/21/1976 12:00349043
367.962/29/1968 18:00310943
377.901/7/1958 15:00267642
387.841/7/1978 8:00355942
397.795/31/1986 23:00390542
407.767/1/1915 3:0088332
417.7512/2/1936 17:00176832
427.6911/10/1983 21:00379432
437.653/13/1993 11:00419332
447.629/16/1958 18:00271532
457.536/11/1922 12:00115532
467.3911/18/1945 5:00214632
477.387/10/1988 3:00398832
487.373/31/1933 22:00162632
497.284/23/1998 14:00441332
507.224/9/1929 1:00147122


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
117.195/9/2006 13:0047458792
217.168/7/1955 4:0025688691
315.363/11/2010 11:0049315041
415.254/16/1954 12:0025104839
513.655/23/1982 2:0037292719
613.396/26/1938 10:0018482516
712.936/29/1921 24:0011172013
812.868/20/1933 1:0016402013
912.193/15/1953 11:002461159
1012.0511/21/1992 15:004179149
1111.945/31/1998 23:004419138
1211.9110/11/1932 15:001607138
1311.575/19/2013 18:005062117
1411.559/22/1996 16:004351117
1511.438/12/1924 10:001248106
1611.353/31/1987 3:003942106
1711.109/14/1962 18:00289296
1811.047/30/1946 20:00217795
1910.908/31/1954 0:00252985
2010.893/31/2004 11:00465485
2110.621/8/1978 21:00355974
2210.545/3/1984 19:00382174
2310.519/6/1999 12:00447174
2410.501/1/1979 15:00359974
2510.3910/27/1953 22:00248864
2610.282/11/1983 23:00376264
2710.0510/6/1955 12:00257953
289.9711/15/1983 22:00379553
299.946/7/1931 12:00156053
309.906/22/1959 9:00275453
319.8611/2/2018 23:00529653
329.8612/8/1969 3:00317753
339.6712/29/1957 5:00267443
349.592/15/1984 0:00380942
359.5910/8/2005 1:00472042
369.5610/8/1895 12:006842
379.537/29/1976 16:00349242
389.403/14/1958 8:00268342
399.288/29/1918 12:00100032
409.2511/10/1945 21:00214432
419.235/21/1920 18:00107732
429.187/18/2008 21:00484832
439.183/31/1904 20:0044232
449.093/5/1993 0:00419132
459.083/20/1933 10:00162432
469.046/5/1986 13:00390632
479.047/18/1926 18:00134232
489.009/15/1961 2:00285332
498.986/9/1922 16:00115532
508.9611/24/1936 4:00176732


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
119.645/12/2006 20:0047468486
218.838/11/1955 17:0025696661
318.222/24/2010 1:0049295446
418.164/16/1954 12:0025105345
516.043/12/1953 22:0024602518
615.425/4/1998 1:0044152014
715.399/7/1996 19:0043491914
815.045/20/1982 15:0037291712
914.966/11/1938 10:0018461612
1014.886/6/1959 14:0027501611
1114.379/27/1962 3:002893139
1214.346/26/1921 9:001117129
1314.2110/23/1953 9:002487128
1414.088/4/1933 3:001638118
1513.729/6/1999 12:00447197
1613.532/6/1983 20:00376196
1713.5311/3/1992 4:00417696
1813.428/3/1954 9:00252786
1913.2410/13/1895 1:006985
2013.147/31/1924 16:00124575
2113.105/8/1931 17:00155475
2213.002/15/1984 0:00380975
2313.0012/9/1957 4:00267075
2412.787/1/1915 3:0088364
2512.753/22/1987 0:00394164
2612.695/8/2013 23:00506164
2712.5311/3/1983 16:00379354
2812.509/28/1932 4:00160654
2912.483/7/1933 16:00162254
3012.383/20/2004 20:00465354
3112.2911/19/1986 2:00392453
3212.2110/21/2018 8:00529353
3312.153/20/1901 20:0031343
3412.1510/6/1955 12:00257943
3512.124/23/1984 20:00382043
3612.1010/8/2005 16:00472043
3712.0412/17/1978 6:00359743
3811.852/12/1993 20:00418843
3911.847/21/1976 12:00349043
4011.748/21/1961 3:00285043
4111.737/21/1946 5:00217643
4211.6612/12/1977 19:00355532
4311.5011/3/1969 1:00317132
4411.5010/23/1945 22:00214232
4511.482/28/1958 1:00268232
4611.3511/8/1972 10:00331132
4711.359/16/1958 18:00271532
4811.182/4/1900 21:0027432
4911.111/30/2008 12:00482132
5011.0110/4/1995 10:00429922


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
123.348/18/1955 6:002571111170
222.595/1/2006 22:00474489120
319.674/16/1954 12:0025103637
419.112/16/2010 9:0049282929
518.843/4/1953 1:0024592726
618.185/2/1998 0:0044142120
717.9211/3/1969 1:0031711918
817.925/29/1982 13:0037301918
917.0010/23/1953 9:0024871312
1016.985/26/1938 15:0018441312
1116.975/23/1959 21:0027491312
1216.9311/30/1957 13:0026691312
1316.658/23/1996 20:0043461211
1416.583/1/1983 18:0037641110
1515.912/20/1933 7:00161998
1615.919/25/1962 23:00289398
1715.869/16/1932 5:00160588
1815.816/26/1921 9:00111787
1915.643/21/1901 11:0031387
2015.337/20/1933 22:00163776
2115.251/30/1984 22:00380666
2215.183/14/1958 8:00268366
2315.022/12/1993 13:00418865
2415.0010/8/1895 12:006865
2514.997/21/1954 4:00252465
2614.984/4/1984 23:00381865
2714.959/6/1999 12:00447165
2814.9211/27/1978 17:00359365
2914.924/26/1931 6:00155365
3014.7011/6/1986 1:00392155
3114.6110/23/1983 20:00379254
3214.615/29/2013 4:00506354
3314.5911/17/1992 15:00417954
3414.5311/28/1977 3:00355254
3514.524/21/1920 6:00107154
3614.499/17/1995 7:00429654
3714.426/26/1915 8:0088344
3814.2811/4/1945 5:00214344
3914.2611/15/1981 3:00370544
4014.2210/11/2014 8:00512744
4113.963/31/2004 11:00465443
4213.917/25/1924 15:00124543
4313.837/15/1919 23:00103333
4413.758/4/1958 16:00270633
4513.733/1/1987 3:00394033
4613.4311/2/1972 10:00331032
4713.439/18/2018 2:00528732
4813.385/4/1922 7:00115232
4913.2310/7/2005 23:00472032
5013.238/19/1991 6:00412432

Frequency Estimates
DurationAverage Recurrence IntervalGEVConstraint
adjustment
1-mo3-mo6-mo1-y2-y5-y10-y25-y50-y100-y200-y500-y1000-yξακ
Event1.001.732.282.743.624.635.537.008.4110.212.316.019.53.3630.6629-0.3116 1.
1-hour.270.450.580.7941.001.221.401.681.932.232.573.133.630.94420.1534-0.2378 1.08
2-hour.410.650.8301.041.341.631.872.232.552.913.333.974.551.2530.2170-0.2044 1.04
3-hour.500.8001.011.201.541.902.202.693.133.664.305.336.301.4400.2491-0.2622 1.02
6-hour.6801.111.361.682.002.412.793.464.155.046.208.2910.41.9010.2488-0.3838 1.01
12-hour.8601.411.762.172.543.023.474.275.106.187.6010.212.92.4270.2870-0.3959 1.00
1-day.9701.632.072.493.073.754.365.366.337.549.0411.614.12.9020.4405-0.3211 1.00
2-day1.041.782.302.803.544.425.236.627.989.7211.915.819.73.3170.5581-0.3513 1.00
3-day1.111.912.502.993.774.695.546.978.3910.212.516.420.43.5360.5871-0.3464 1.00
4-day1.162.062.683.243.944.815.647.078.5110.412.817.121.53.7290.5392-0.3755 1.00
7-day1.272.413.123.844.695.706.638.209.7511.714.218.622.94.4360.6414-0.3475 1.00
10-day1.312.793.584.305.246.367.389.1010.812.915.720.425.14.9570.7135-0.3425 1.00
20-day1.313.664.825.686.938.359.5911.613.515.918.723.528.26.5700.9414-0.2982 1.00
30-day1.314.245.867.018.4610.011.313.415.417.720.525.029.28.0451.070-0.2655 1.00
45-day1.314.567.168.8810.612.413.816.018.020.222.827.030.710.141.275-0.2182 1.00
60-day1.314.568.3610.512.714.716.318.720.723.025.629.533.012.081.519-0.1811 1.00
90% confidence intervals
Duration1-y2-y5-y10-y25-y50-y100-y200-y500-y1000-y
1-hour0.77-0.810.97-1.041.16-1.281.31-1.501.50-1.881.66-2.271.81-2.761.98-3.392.24-4.492.43-5.56
2-hour1.00-1.061.29-1.381.56-1.721.76-2.012.02-2.502.22-2.982.43-3.602.64-4.352.95-5.623.20-6.92
3-hour1.15-1.231.49-1.591.81-2.002.05-2.382.37-3.042.64-3.722.92-4.623.23-5.793.65-7.934.00-10.18
6-hour1.63-1.701.95-2.062.29-2.542.58-3.013.01-3.943.38-4.993.80-6.524.29-8.705.00-13.165.64-18.23
12-hour2.12-2.202.48-2.622.89-3.173.23-3.763.74-4.944.20-6.364.74-8.415.36-11.366.28-17.777.15-25.36
1-day2.41-2.542.98-3.173.58-3.974.07-4.754.73-6.205.29-7.855.89-10.056.55-13.167.56-19.088.43-25.43
2-day2.71-2.863.43-3.674.19-4.694.80-5.715.71-7.736.48-10.007.37-13.118.35-17.619.89-26.4311.24-36.30
3-day2.89-3.063.65-3.924.44-5.025.09-6.086.00-8.176.78-10.367.63-13.508.54-17.9410.00-26.8111.24-36.94
4-day3.14-3.293.83-4.074.58-5.095.20-6.116.12-8.236.92-10.767.82-14.388.81-19.6710.33-30.6511.74-43.11
7-day3.73-3.914.56-4.845.44-6.026.14-7.197.17-9.408.03-11.908.98-15.3710.04-20.1411.68-29.8613.13-40.81
10-day4.16-4.385.09-5.406.08-6.706.86-8.017.96-10.488.91-13.149.94-16.9811.09-22.3512.91-32.7714.43-44.42
20-day5.50-5.786.73-7.157.97-8.788.95-10.3410.35-13.1911.54-16.3912.79-20.5914.17-26.0216.09-36.3117.73-47.36
30-day6.81-7.128.24-8.699.61-10.5010.68-12.1312.14-15.0113.28-18.0414.52-21.9315.80-27.0317.71-36.2319.21-45.85
45-day8.65-9.0110.39-10.9111.97-12.9313.15-14.6714.68-17.6615.88-20.7017.13-24.4518.50-29.2120.34-37.3921.85-45.52
60-day10.25-10.7112.34-12.9714.16-15.2615.47-17.1717.14-20.3718.43-23.4319.80-27.1821.16-31.7922.87-39.8624.28-47.58

GEV distribution fitted using L-moments for ≥1 year
Empirical results for periods <1 year
NOAA Atlas 14 frequency estimates
Input file: C:\Calcs\MetData\MA\Boston\Logan.1h
Analysis completed: 02/28/2021 10:12
Elapsed time : 250.2 seconds
Developed by Mitch Heineman, Ajay Prasad, Constantine Karos, and Masoud Soltani. CDM Smith, 1991-2021