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)
≥0.00≥0.10≥0.25≥0.50≥0.75≥1.00≥2.00
189436.286610.0550.0801.0716.371938755372617121
189540.116020.0670.0970.9312.931899163402418133
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
190532.176120.0530.0841.0017.88217795233241671
190640.696370.0640.0981.5313.9521210062392818122
190737.566550.0570.0780.6815.001899458432316122
190830.045080.0590.0921.5512.27218805735221070
190939.376540.0600.0710.5116.211938255412216103
191028.325580.0510.0600.6515.59188935238191080
191135.776550.0550.0790.9515.921848658372617101
191234.556110.0570.0821.3413.951798655412616111
191338.016790.0560.0760.9117.56184826141282082
191434.276510.0530.0620.5116.771777650382420122
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
194437.066500.0570.0960.8519.111967646372615113
194547.288810.0540.0760.9718.3315410770493124123
194638.086180.0620.0851.0915.321848455382216123
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
195240.607490.0540.0921.6317.621649556422617133
195357.738370.0690.0880.6618.091649058473427218
195462.328750.0710.1161.2219.1016710965473126186
195556.507260.0780.1531.6017.001779757423022175
195647.398820.0540.0770.9518.5517310262493621114
195733.926390.0530.0680.5717.59190835336221373
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
198942.427810.0540.0730.7017.041329666452921131
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
199535.126620.0530.0780.6616.931749552402418113
199649.437440.0660.0860.7315.591599561513016133
199730.256190.0490.0600.5816.0920695493521962
199853.206900.0770.1171.3417.161738358422819157
199937.835840.0650.1051.3114.88188855241251592
200044.526760.0660.0900.7216.511738659463517103
200129.645220.0570.0890.9814.09186814932201062
200239.927320.0550.0690.9117.841819262443318122
200340.787060.0580.0880.9615.6520310164402921130
200443.556460.0670.0960.7419.891848751372820124
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
201337.096430.0580.0800.7516.561689653401913112
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
Mean41.04693.320.060.080.9016.33185.4190.957.841.626.717.711.92.7
Longest drought = 36 days preceding 04/03/1915
Period of record = 127.00 years
Period missing = 0.00 years
Records = 88052
Mean event depth = 0.873 (≥.25 inches)
Annual event depth = 37.1 (≥.25 inches)
Mean event duration = 17.33 hours
Interevent coefficient of variation = 0.85 (excluding periods exceeding 40 dry days)
Interevent time = 12 hours
ARI: Average recurrence interval
AMS: Annual maximum series


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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


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

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-hour0.77-0.810.97-1.041.17-1.281.31-1.511.51-1.891.67-2.281.84-2.762.01-3.402.27-4.512.48-5.57
2-hour1.00-1.061.29-1.381.56-1.711.75-2.012.01-2.482.22-2.942.43-3.532.64-4.252.95-5.523.18-6.81
3-hour1.16-1.231.49-1.591.81-2.002.05-2.372.39-3.042.67-3.732.98-4.643.29-5.823.74-7.944.10-10.18
6-hour1.63-1.701.95-2.062.30-2.532.59-3.023.03-4.003.40-5.113.80-6.664.29-8.855.07-13.245.78-18.20
12-hour2.11-2.202.48-2.612.89-3.173.22-3.753.73-4.904.17-6.284.67-8.275.24-11.206.15-17.166.87-24.27
1-day2.41-2.532.98-3.183.58-3.964.05-4.744.73-6.175.27-7.715.90-9.906.59-12.847.60-18.458.41-24.10
2-day2.71-2.863.42-3.654.18-4.674.80-5.685.72-7.716.49-9.897.37-13.088.38-17.549.97-26.2111.30-35.83
3-day2.89-3.053.66-3.914.46-4.985.10-6.076.04-8.176.86-10.437.77-13.648.79-18.1910.30-26.8911.54-36.29
4-day3.14-3.303.83-4.084.58-5.095.19-6.126.13-8.256.96-10.677.86-14.238.93-19.1510.51-29.3411.96-41.44
7-day3.73-3.914.57-4.845.45-6.036.16-7.197.20-9.408.09-11.989.11-15.3810.24-20.1312.01-29.6713.52-40.02
10-day4.17-4.375.10-5.406.07-6.706.85-8.017.97-10.548.93-13.2610.01-17.0811.22-22.6312.99-32.8814.55-44.40
20-day5.51-5.796.74-7.157.98-8.768.94-10.2910.33-13.1611.48-16.2112.74-20.4814.17-26.1916.22-36.6318.03-48.40
30-day6.81-7.138.25-8.709.64-10.5010.70-12.1312.14-15.0413.35-18.1614.64-22.0416.04-26.9618.06-35.6319.67-44.98
45-day8.64-9.0210.38-10.9211.98-12.9213.11-14.7114.61-17.6615.82-20.5617.06-24.3118.30-28.9120.08-36.9221.46-44.73
60-day10.25-10.7012.35-12.9714.21-15.2315.56-17.1517.26-20.2618.62-23.2519.97-27.0121.38-31.6223.32-39.3424.86-47.06

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: 06/19/2021 13:17
Elapsed time : 292.2 seconds
Developed by Mitch Heineman, Ajay Prasad, Constantine Karos, and Masoud Soltani. CDM Smith, 1991-2021