CDM Smith

 NetSTORM Point Precipitation Frequency Estimates

NetSTORM
Annual Statistics  |  Event Listings  |  Frequency Estimates

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


Monthly Statistics
MonthTotalRecordsMeanStandard DeviationMaximumDuration
Jan 3.4274.130.0460.0540.65017.61
Feb 3.2468.020.0480.0540.66018.20
March3.7475.100.0500.0570.68018.13
April3.6768.070.0540.0620.91017.87
May 3.2157.430.0560.0720.98017.78
June 3.3146.890.0710.1081.54015.25
July 3.1837.110.0860.1401.61011.63
Aug 3.3439.630.0840.1412.03011.32
Sep 3.2841.790.0780.1181.58014.69
Oct 3.3350.800.0660.0891.53016.46
Nov 3.7063.560.0580.0740.97018.25
Dec 3.7171.240.0520.0610.81017.24

Hour of Day Statistics
HourJan Feb MarchAprilMay June July Aug Sep Oct Nov Dec TotalRecordsMeanStandard DeviationMaximum
1:000.150.150.160.170.170.120.090.130.120.170.160.171.7628.960.0610.0830.96
2:000.140.140.180.150.150.120.140.130.130.170.170.161.7629.530.0600.0842.03
3:000.150.140.180.170.140.140.130.130.160.180.170.161.8530.700.0600.0841.35
4:000.140.130.160.180.150.130.130.110.180.170.170.161.8230.840.0590.0841.58
5:000.150.130.170.170.140.130.140.120.160.140.170.161.7930.410.0590.0811.17
6:000.150.130.170.150.140.120.150.130.140.140.190.151.7730.540.0580.0801.11
7:000.150.140.170.140.140.120.140.140.160.130.160.171.7830.600.0580.0841.61
8:000.150.140.160.130.130.140.120.170.140.120.140.151.6929.330.0580.0861.56
9:000.140.140.150.130.110.140.120.160.130.120.150.141.6528.260.0580.0821.41
10:000.150.150.160.120.130.120.100.130.140.130.150.141.6128.250.0570.0771.10
11:000.160.150.150.130.130.100.090.130.120.110.150.151.5827.010.0580.0771.10
12:000.150.140.140.130.120.110.120.140.120.130.180.151.6427.550.0600.0821.22
13:000.150.140.140.140.110.130.100.130.160.130.160.151.6427.310.0600.0901.54
14:000.140.130.140.160.100.180.130.160.160.140.130.151.7227.040.0630.0971.63
15:000.130.140.130.150.110.150.160.210.150.130.120.141.7427.150.0640.1031.55
16:000.140.140.150.160.120.200.170.180.130.130.130.141.7828.460.0630.0981.60
17:000.130.140.150.160.140.200.250.170.110.140.120.141.8529.440.0630.0991.34
18:000.130.120.150.160.130.180.180.140.120.120.140.171.7529.190.0600.0841.05
19:000.140.120.160.160.140.120.170.140.120.130.160.171.7229.690.0580.0821.45
20:000.140.120.160.150.140.130.140.130.120.130.140.161.6728.660.0580.0821.09
21:000.130.120.150.160.140.140.120.110.120.120.140.151.6128.140.0570.0770.80
22:000.140.140.150.140.120.150.090.100.140.150.150.161.6228.910.0560.0801.53
23:000.140.140.150.160.150.130.090.120.130.150.150.151.6428.700.0570.0801.38
24:000.150.130.150.170.150.120.090.120.130.160.170.171.6929.110.0580.0781.24


Day of Week Statistics
WeekdayTotalRecordsMeanStandard DeviationMaximumDuration
Sun5.9197.900.0600.0861.6016.13
Mon5.7498.980.0580.0801.6115.76
Tue5.86101.480.0580.0831.6316.31
Wed5.7998.870.0590.0821.3317.15
Thu5.9396.310.0620.0892.0316.08
Fri6.00100.810.0590.0851.5516.33
Sat5.9299.440.0600.0881.5416.52
YearTotalRecordsMeanStandard
Deviation
MaximumDuration
(h)
Interevent
(h)
≥0.00≥0.05≥0.10≥0.25≥0.50≥1.00≥2.00
189436.286610.0550.0801.0716.371938764553726121
189540.116020.0670.0970.9312.931899169634024133
189637.347810.0480.0560.5717.27172917158452992
189740.086350.0630.0830.6711.4117310075654629122
189849.668420.0590.0730.9114.581389481745730154
189934.616060.0570.0901.2215.712138358483826111
190043.976180.0710.0800.6015.951948764554024155
190148.606690.0730.0951.2415.402179067603929155
190233.766040.0560.0670.7314.271999068564026111
190341.247280.0570.0740.6519.071608968644128113
190439.626890.0580.0790.8513.091901037864412262
190532.176120.0530.0841.0017.88217795852332471
190640.696370.0640.0981.5313.9521210076623928122
190737.566550.0570.0780.6815.001899472584323122
190830.045080.0590.0921.5512.27218806557352270
190939.376540.0600.0710.5116.211938260554122103
191028.325580.0510.0600.6515.59188936352381980
191135.776550.0550.0790.9515.921848664583726101
191234.556110.0570.0821.3413.951798664554126111
191338.016790.0560.0760.9117.56184826761412882
191434.276510.0530.0620.5116.771777656503824122
191538.765900.0660.1091.1716.11238796349352294
191637.367850.0480.0711.2717.951991007563382993
191738.996580.0590.0941.2415.322109372553823131
191833.566210.0540.0770.8715.002509671573121122
191942.417530.0560.0760.6617.381838973604230122
192046.137860.0590.0710.5618.261988868584230155
192142.046590.0640.1181.4517.491979161524123104
192241.126240.0660.0890.9217.852027259533821114
192334.726260.0550.0670.5411.83184847162452092
192436.995360.0690.1010.8213.30193796257392282
192540.176430.0620.0830.7013.061598569625226101
192639.285720.0690.1060.9411.611908569554424103
192740.906490.0630.0940.9913.081641007366483390
192838.356360.0600.0890.8913.591758867574329112
192937.156770.0550.0730.7913.571848674584626111
193034.876170.0570.0810.8716.891917963503622102
193143.456950.0630.0810.6119.951998159523728143
193241.616320.0660.0910.7516.392208860513525114
193346.207780.0590.0910.9018.172069568553828113
193434.716280.0550.0790.9113.55205957363402862
193532.946020.0550.0720.6817.322388254443420112
193647.057230.0650.0840.9114.4717510065574529203
193743.376820.0640.0870.8116.331699074614826125
193850.528520.0590.0951.3819.0717310277634624154
193932.426370.0510.0600.3815.10206886754402582
194036.087450.0480.0620.6420.342449964493119131
194130.885660.0550.0750.9715.462267857493722111
194242.477290.0580.0850.8513.801718667554527161
194332.236210.0520.0750.7417.51192996452382263
194437.066500.0570.0960.8519.111967660463726113
194547.288810.0540.0760.9718.3315410781704931123
194638.086180.0620.0851.0915.321848468553822123
194737.905760.0660.1031.3118.222207254483724132
194840.387710.0520.0730.9618.22159917766483292
194931.566040.0520.0881.5812.67187896960412442
195032.717000.0470.0700.6718.252369468583616101
195146.978110.0580.0760.7415.3115210275675132172
195240.607490.0540.0921.6317.621649568564226133
195357.738370.0690.0880.6618.091649072584734218
195462.328750.0710.1161.2219.1016710980654731186
195556.507260.0780.1531.6017.001779770574230175
195647.398820.0540.0770.9518.5517310273624936114
195733.926390.0530.0680.5717.59190835953362273
195861.639610.0640.0870.9718.2413410477645439228
195951.418570.0600.0931.0718.7716810078674835163
196044.466660.0670.1021.5416.931928663544231175
196147.847510.0640.0850.9516.511728966604531174
196243.237340.0590.0760.7517.922169364553724105
196334.846570.0530.0670.7214.86190866760402672
196436.476770.0540.0750.8218.452119158503624120
196523.715900.0400.0470.4217.38251905645301761
196636.016480.0560.0750.9016.082289463523726110
196747.518100.0590.0891.5616.581619479674826174
196842.266810.0620.0700.4815.952098563533930152
196947.897200.0670.0780.5019.171998465554027155
197041.917330.0570.0740.9516.451908972604228134
197135.677040.0510.0660.5415.47188877160402591
197253.099210.0580.0780.8516.0414611387735339154
197342.767480.0570.0820.9715.211529673615131112
197440.346520.0620.0910.8813.38168977362452693
197545.808580.0530.0630.5719.361809073584327135
197636.726470.0570.0890.9313.91173927360452392
197744.178220.0540.0630.4417.421759474654328162
197837.646680.0560.0751.0017.832018163493823114
197944.177790.0570.0841.0819.281809266584126155
198029.475120.0580.0790.7012.37241896852351890
198135.716790.0530.0650.8020.57223866555352182
198244.617160.0620.0830.9017.121908764553829133
198353.607790.0690.0790.6016.601659672614734185
198450.097440.0670.0860.6616.931789166564429154
198536.586960.0530.1062.0316.49174986458442582
198644.336820.0650.0810.6617.312149068573927134
198745.487490.0610.0790.7519.302028256513929135
198834.785880.0590.0820.7313.08221966755372193
198942.427810.0540.0730.7017.041329671664529131
199046.507110.0650.0990.9317.862019169574429146
199142.256800.0620.0850.7218.311978259543826145
199243.727330.0600.0920.9717.041789571594723104
199343.217540.0570.0760.6314.7918410070594333142
199447.608060.0590.0870.8418.631539771604329164
199535.126620.0530.0780.6616.931749570524024113
199649.437440.0660.0860.7315.591599577615130133
199730.256190.0490.0600.5816.09206956749352162
199853.206900.0770.1171.3417.161738362584228157
199937.835840.0650.1051.3114.88188856252412592
200044.526760.0660.0900.7216.511738669594635103
200129.645220.0570.0890.9814.09186816149322062
200239.927320.0550.0690.9117.841819271624433122
200340.787060.0580.0880.9615.6520310174644029130
200443.556460.0670.0960.7419.891848765513728124
200541.197140.0580.0700.5717.411839271634427102
200651.897630.0680.0830.5818.221729173644526136
200738.966530.0600.1021.6115.902109071563726113
200853.107560.0700.1010.9814.211379981735733155
200942.327340.0580.0740.7415.741599274684933122
201047.146720.0700.1121.5118.582158754473523135
201150.137650.0660.0840.8118.041599871665136202
201236.736260.0590.0991.3317.652239064523729111
201337.096430.0580.0800.7516.561689659534019112
201444.867490.0600.0760.8017.961559364625032124
201534.766570.0530.0730.5017.002169163523825122
201632.605980.0550.0690.6814.431899568553520120
201741.207650.0540.0790.6920.051959676613928132
201849.477740.0640.0981.1215.1914910582715341191
201946.927820.0600.1001.4113.1616010990764930151
202036.296300.0580.0861.2315.241998969564027100
202140.165200.0770.1181.0714.911616951493427133
Mean41.14693.780.060.080.9116.32185.2691.068.257.941.726.712.02.8
Longest drought = 36 days preceding 04/03/1915
Period of record = 127.67 years
Period missing = 0.00 years
Records = 88572
Mean event depth = 0.874 (≥.25 inches)
Annual event depth = 37.2 (≥.25 inches)
Mean event duration = 17.32 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 6:00257140.00361.41182.34
28.865/12/2006 20:00474695.00770.4361.33
37.8910/20/1996 4:00435533.00310.7339.71
47.869/15/1933 24:00164542.00410.9039.14
57.0110/5/1962 8:00289461.00550.5925.31
66.983/13/2010 11:00493158.00580.4324.90
76.776/4/1982 17:00373283.00770.3622.14
86.776/12/1998 16:00442143.00321.3422.14
96.047/9/1921 2:00111822.00141.4514.21
106.033/31/2004 11:00465444.00410.5314.12
116.005/30/1984 17:00382576.00560.4313.85
125.9110/17/1932 16:00160766.00570.6113.05
135.745/15/1954 20:00251618.00180.9811.64
145.7312/11/1992 4:00418253.00410.4911.56
155.7210/12/1895 15:006939.00390.6411.48
165.649/10/1954 19:00253123.00181.2210.86
175.477/21/1938 6:00185280.00460.789.63
185.407/1/1915 3:0088350.00341.179.15
195.356/5/1986 13:00390662.00460.548.82
205.224/27/1904 3:0044872.00500.378.00
215.176/8/1931 15:00156070.00460.347.71
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 19:00111769.00440.565.56
284.719/10/1999 8:00447317.00171.315.33
294.689/2/1905 23:0049938.00340.915.20
304.637/31/1985 14:00387214.00132.034.99
314.5912/26/1969 1:00318151.00390.414.82
324.488/22/2010 10:00494779.00531.094.38
334.378/25/1924 23:00124917.00170.783.98
344.3510/8/1998 13:00443782.00580.603.91
354.279/9/1924 22:00125315.00150.823.64


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
12.038/1/1985 2:0038726429
21.638/5/1952 14:0024392111
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
211.248/10/1917 7:0096654
221.248/24/1901 24:0033554
231.238/23/2020 17:00538354
241.228/22/1899 19:0025654
251.229/11/1954 12:00253154
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
321.079/2/2021 4:00543232
331.077/19/1959 20:00276032
341.078/21/1894 13:002532
351.067/31/2019 15:00534032


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
12.858/1/1985 2:0038729237
22.518/19/1955 9:0025714720
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
141.828/21/1894 13:002585
151.826/13/1998 14:00442185
161.808/5/1952 14:00243985
171.787/30/1926 5:00134475
181.788/25/2010 9:00494775
191.7310/9/1906 22:0053665
201.709/15/1904 7:0046664
211.699/2/2021 3:00543264
221.687/18/1912 17:0076664
231.678/16/1938 23:00185454
241.678/7/1908 14:0061654
251.677/30/2007 6:00479954
261.667/24/1926 8:00134354
271.657/10/2010 14:00494354
281.629/12/1960 14:00280954
291.628/18/1994 5:00425754
301.579/16/1933 8:00164543
311.556/4/1960 13:00280043
321.546/19/1942 23:00199943
331.537/3/1916 17:0092343
341.538/3/2001 19:00455443
351.518/4/1915 15:0088733


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
13.618/19/1955 9:0025719556
23.588/1/1985 1:0038729153
33.026/13/1998 14:0044214222
42.927/1/1915 5:008833619
52.638/10/1917 6:009662212
62.587/9/1921 19:0011182011
72.508/6/1967 7:0030851810
82.499/11/1954 11:0025311710
92.499/10/1999 21:0044731710
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 8:00134396
152.167/28/2007 15:00479896
162.168/25/2010 8:00494796
172.129/2/2021 3:00543285
182.038/26/1924 10:00124975
192.038/21/1894 13:002575
202.039/1/1949 3:00230675
212.019/15/1904 6:0046664
221.9610/14/1990 1:00408964
231.958/18/1994 5:00425754
241.948/24/1901 24:0033554
251.939/12/1960 14:00280954
261.929/20/1899 8:0025854
271.899/10/1924 2:00125354
281.897/28/1911 12:0072254
291.8910/9/1906 22:0053654
301.8511/23/1992 3:00417943
311.858/4/1915 15:0088743
321.8210/20/1996 6:00435543
331.816/19/1942 23:00199943
341.818/5/1952 13:00243943
351.807/21/1938 16:00185243


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
15.468/19/1955 6:002571128135
24.189/11/1954 10:0025315032
34.157/31/1985 22:0038724831
44.035/16/1954 1:0025164326
53.716/13/1998 14:0044213118
63.629/10/1999 18:0044732816
73.539/16/1933 5:0016452615
83.377/1/1915 3:008832112
93.3310/14/1990 1:0040892011
103.248/26/1924 9:0012491810
113.139/2/2021 0:005432169
123.1011/23/1992 3:004179158
133.059/10/1924 2:001253148
143.0510/20/1996 6:004355148
152.938/10/1917 5:00966127
162.799/15/1904 3:0046696
172.767/28/1911 10:0072296
182.7012/6/1937 19:00181885
192.667/9/1921 19:00111885
202.617/17/2018 14:00527875
212.608/6/1967 6:00308574
222.578/25/2010 6:00494764
232.579/20/1899 6:0025864
242.527/1/2021 21:00542064
252.4910/31/1895 22:007064
262.399/17/1995 13:00429653
272.397/10/1955 15:00256753
282.379/14/1944 20:00208843
292.3710/13/1895 15:006943
302.348/5/1952 14:00243943
312.339/16/1932 9:00160543
322.319/12/1960 12:00280943
332.309/13/1918 3:00100243
342.307/30/1926 4:00134443
352.297/24/1926 6:00134343


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
16.748/19/1955 5:002571131132
25.545/15/1954 21:0025166545
35.449/11/1954 5:0025316141
45.019/16/1933 2:0016454526
54.9410/20/1996 5:0043554324
64.816/13/1998 7:0044213821
74.379/10/1999 13:0044732614
84.307/31/1985 16:0038722513
94.119/9/1924 22:0012532011
104.059/1/2021 19:0054321910
113.978/26/1924 3:001249189
123.857/1/1915 3:00883158
133.6310/13/1990 18:004089126
143.596/6/2000 12:004506116
153.489/14/1904 24:00466105
163.467/28/1911 6:0072295
173.4311/22/1992 22:00417995
183.387/9/1921 2:00111885
193.2410/13/1895 9:006974
203.2312/12/1992 2:00418274
213.164/1/2004 13:00465464
223.1310/5/1995 19:00429964
233.085/31/1984 7:00382554
243.016/9/1931 16:00156053
253.019/3/1972 5:00330253
263.0010/5/1962 20:00289453
272.978/10/1917 3:0096643
282.923/31/1934 18:00166543
292.924/21/1991 4:00411343
302.9110/15/1930 5:00152743
312.9112/6/1937 16:00181843
322.877/1/2021 20:00542043
332.869/16/1932 8:00160543
342.869/18/2004 3:00467643
352.8511/12/1947 5:00222343


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
18.358/18/1955 13:002571149134
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 1:0016453017
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
194.239/1/2021 12:00543295
204.196/9/1931 8:00156085
214.186/6/2000 9:00450685
224.175/31/1984 2:00382585
234.1712/26/1969 6:00318185
244.133/17/1968 22:00311185
254.036/5/1986 21:00390675
263.9110/13/1990 9:00408964
273.7611/22/1992 12:00417954
283.696/18/1922 22:00115653
293.6910/14/2005 18:00472153
303.6710/1/1984 14:00383743
313.6510/18/1932 12:00160743
323.645/25/1967 10:00307543
333.623/29/2010 15:00493343
343.608/9/1917 9:0096643
353.586/7/2013 7:00506643


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
111.948/18/1955 6:002571206278
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 2:0011181711
96.033/31/2004 11:0046541711
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 8:001607139
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 3:00493375
224.719/10/1999 8:00447364
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 1:00318154
284.378/25/1924 23:00124954
294.354/5/1987 0:00394354
304.289/9/1924 5:00125343
314.246/6/2000 8:00450643
324.239/1/2021 12:00543243
334.227/1/2021 21:00542043
344.1610/13/2005 22:00472143
354.156/18/1922 6:00115643


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
112.478/17/1955 13:002570208238
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 8:0028942515
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 22:003825138
125.9110/17/1932 16:001607137
135.829/9/1954 3:002531127
145.745/15/1954 20:002516117
155.7312/11/1992 4:004182117
165.7210/12/1895 15:0069117
175.437/1/1915 3:0088395
185.356/5/1986 13:00390685
195.277/21/1938 13:00185285
205.224/27/1904 3:0044885
215.176/8/1931 15:00156075
225.113/17/1968 15:00311174
235.024/4/1987 9:00394364
244.999/8/1999 7:00447264
254.989/12/1944 19:00208864
264.933/29/2010 3:00493364
274.9311/22/1953 23:00249064
284.927/1/2021 12:00542064
294.816/18/1922 22:00115654
304.766/29/1921 19:00111754
314.689/2/1905 23:0049953
324.637/31/1985 14:00387253
334.5912/26/1969 1:00318143
344.527/30/1946 20:00217743
354.438/22/2010 13:00494743


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
112.478/17/1955 13:002570189198
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 13:004654137
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 4:004182105
185.447/1/1915 3:0088385
195.394/27/1904 3:0044884
205.366/5/1986 13:00390684
215.319/7/1999 3:00447184
225.306/7/2013 7:00506674
235.246/7/1931 12:00156074
245.206/18/1922 6:00115674
255.173/17/1968 16:00311174
265.144/4/1987 9:00394374
275.086/30/2021 18:00542064
284.989/12/1944 19:00208863
294.933/29/2010 3:00493353
304.9311/22/1953 23:00249053
314.816/29/1921 1:00111753
324.699/2/1905 23:0049943
334.6312/24/1969 6:00318143
344.633/12/1953 22:00246043
354.637/31/1985 14:00387243


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 12:006864
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
315.477/1/2021 12:00542043
325.4711/4/1969 12:00317243
335.468/5/1952 7:00243943
345.444/25/1904 4:0044843
355.2410/8/1998 13:00443732


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
114.258/17/1955 13:002570144196
210.805/9/2006 13:0047454940
310.576/29/1921 22:0011174535
49.805/29/1982 5:0037303323
59.585/7/1954 2:0025143020
69.539/27/1962 10:0028932920
78.959/7/1999 3:0044712314
88.943/13/2010 12:0049312214
98.486/8/1998 18:0044211811
108.466/7/1931 12:0015601811
118.2810/20/1996 4:0043551610
128.039/9/1933 2:001645149
137.903/31/1987 3:003942138
147.806/30/2021 18:005420128
157.787/18/1938 9:001851127
167.765/23/1984 19:003823127
177.739/7/1954 11:002530127
187.706/7/2013 0:005066127
197.497/1/1915 3:00883106
207.0611/3/1969 2:00317185
216.973/10/1968 18:00311075
226.9110/17/1932 24:00160775
236.6412/3/1992 2:00418164
246.626/5/1986 13:00390664
256.587/11/1959 5:00275864
266.483/26/2004 23:00465454
276.466/1/2006 20:00474953
286.4610/7/2005 23:00472053
296.2212/22/1969 6:00318043
306.216/11/1922 16:00115543
316.143/2/1983 4:00376443
326.1010/8/1895 12:006843
336.078/23/2021 17:00543143
346.028/13/1994 7:00425643
355.987/30/1946 20:00217743


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
116.818/11/1955 17:002569130193
214.483/11/2010 11:0049316772
312.865/3/1954 9:0025133932
412.215/1/2006 22:0047443123
512.046/2/1982 2:0037312921
611.488/28/1933 17:0016422316
711.246/26/1921 9:0011172115
810.926/12/1998 16:0044211812
910.869/17/1962 19:0028921812
1010.598/31/1954 0:0025291610
1110.5811/23/1992 2:0041791610
1210.5010/8/1996 17:0043541510
1310.093/12/1953 22:002460128
1410.046/22/2021 15:005419128
159.958/25/1924 23:001249118
169.855/29/2013 22:005064117
179.4012/8/1969 4:00317796
189.369/6/1999 12:00447185
199.153/31/1987 3:00394285
209.117/10/1938 2:00185075
219.001/6/1979 4:00360075
228.9510/7/2005 23:00472074
238.906/7/1931 12:00156074
248.899/8/1918 16:00100174
258.863/26/2004 23:00465464
268.809/15/1961 1:00285364
278.7310/18/1932 10:00160764
288.713/1/1983 20:00376464
298.6210/12/1895 15:006964
308.297/30/1946 20:00217753
318.245/13/1984 22:00382343
328.127/2/1959 0:00275643
338.1211/3/1969 1:00317143
348.0911/23/1953 3:00249043
358.0710/27/2018 11:00529443


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
117.195/9/2006 13:0047458892
217.168/7/1955 4:0025688791
315.363/11/2010 11:0049314941
415.254/16/1954 12:0025104839
513.655/23/1982 2:0037292619
613.396/26/1938 10:0018482416
712.936/29/1921 24:0011172013
812.868/20/1933 1:0016401913
912.193/15/1953 11:002461149
1012.0511/21/1992 15:004179139
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
1711.218/4/2021 19:00542796
1811.109/14/1962 18:00289286
1911.047/30/1946 20:00217785
2010.908/31/1954 0:00252985
2110.893/31/2004 11:00465485
2210.621/8/1978 21:00355974
2310.596/14/2021 9:00541864
2410.545/3/1984 19:00382164
2510.519/6/1999 12:00447164
2610.501/1/1979 9:00359964
2710.3910/27/1953 22:00248864
2810.282/11/1983 23:00376254
2910.0510/6/1955 12:00257953
309.9711/15/1983 22:00379553
319.946/7/1931 12:00156053
329.906/22/1959 9:00275443
339.8611/2/2018 23:00529643
349.8612/8/1969 3:00317743
359.6712/29/1957 5:00267443


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
119.645/12/2006 20:0047468486
218.838/11/1955 17:0025696561
318.222/24/2010 1:0049295346
418.164/16/1954 12:0025105245
516.043/12/1953 22:0024602418
615.425/4/1998 1:0044151914
715.399/7/1996 19:0043491914
815.045/20/1982 15:0037291612
914.966/11/1938 10:0018461612
1014.886/6/1959 14:0027501511
1114.485/28/2021 19:005415139
1214.379/27/1962 3:002893129
1314.346/26/1921 9:001117129
1414.2110/23/1953 9:002487118
1514.088/4/1933 3:001638118
1613.729/6/1999 12:00447197
1713.532/6/1983 20:00376186
1813.5311/3/1992 4:00417686
1913.428/3/1954 9:00252786
2013.2410/13/1895 1:006975
2113.147/31/1924 16:00124575
2213.105/8/1931 17:00155475
2313.002/15/1984 0:00380965
2413.0012/9/1957 4:00267065
2512.787/1/1915 3:0088364
2612.753/22/1987 0:00394164
2712.695/8/2013 23:00506164
2812.5311/3/1983 16:00379354
2912.509/28/1932 4:00160654
3012.483/7/1933 16:00162254
3112.383/20/2004 20:00465354
3212.2911/19/1986 2:00392453
3312.2110/21/2018 8:00529343
3412.153/20/1901 20:0031343
3512.1510/6/1955 12:00257943


RankTotalDateEvent IDGauge ARI (y)Atlas ARI (y)
123.348/18/1955 6:002571108170
222.595/1/2006 22:00474487120
319.674/16/1954 12:0025103537
419.112/16/2010 9:0049282829
518.843/4/1953 1:0024592626
618.185/2/1998 0:0044142020
717.9211/3/1969 1:0031711818
817.925/29/1982 13:0037301818
917.206/30/2021 18:0054201414
1017.0010/23/1953 9:0024871312
1116.985/26/1938 15:0018441312
1216.975/23/1959 21:0027491312
1316.9311/30/1957 13:0026691312
1416.658/23/1996 20:0043461111
1516.583/1/1983 18:0037641110
1615.912/20/1933 7:00161988
1715.919/25/1962 23:00289388
1815.869/16/1932 5:00160588
1915.816/26/1921 9:00111787
2015.643/21/1901 11:0031377
2115.337/20/1933 22:00163766
2215.251/30/1984 22:00380666
2315.183/14/1958 8:00268366
2415.022/12/1993 13:00418865
2515.0010/8/1895 12:006865
2614.997/21/1954 4:00252465
2714.984/4/1984 23:00381855
2814.959/6/1999 12:00447155
2914.9211/27/1978 17:00359355
3014.924/26/1931 6:00155355
3114.7011/6/1986 1:00392155
3214.6110/23/1983 20:00379254
3314.615/29/2013 4:00506354
3414.5911/17/1992 15:00417954
3514.5311/28/1977 3:00355254

Frequency Estimates
DurationAverage Recurrence IntervalGEVConstraint
adjustment
1-mo3-mo6-mo1-y2-y5-y10-y25-y50-y100-y200-y500-y1000-yξακ
Event1.001.742.282.753.634.635.526.998.3910.112.315.919.43.3690.6619-0.3097 1.
1-hour.270.450.580.7981.011.221.401.681.932.222.563.113.610.94770.1532-0.2361 1.08
2-hour.410.650.8401.041.351.641.882.242.542.893.293.914.461.2620.2194-0.1944 1.04
3-hour.510.8001.011.211.551.912.222.693.133.654.275.286.211.4520.2510-0.2555 1.02
6-hour.6901.111.371.682.022.432.823.504.195.086.238.2910.41.9160.2561-0.3764 1.01
12-hour.8601.411.772.182.563.043.514.325.156.247.6610.212.92.4430.2949-0.3903 1.00
1-day.9701.632.092.503.093.774.385.386.347.549.0211.614.02.9190.4440-0.3168 1.00
2-day1.051.792.312.823.564.455.266.637.979.6711.815.619.33.3430.5640-0.3436 1.00
3-day1.111.912.503.013.804.735.576.998.3810.112.316.219.93.5630.5959-0.3372 1.00
4-day1.162.072.683.253.974.855.677.088.5110.312.716.921.13.7530.5462-0.3678 1.00
7-day1.272.413.143.874.715.716.638.209.7511.714.218.622.94.4570.6368-0.3484 1.00
10-day1.312.793.594.315.286.427.459.1710.812.915.620.124.64.9930.7351-0.3305 1.00
20-day1.313.674.825.696.998.439.6811.713.615.818.623.227.66.6180.9696-0.2848 1.00
30-day1.314.245.877.038.5310.111.413.515.417.620.324.528.58.1031.103-0.2499 1.00
45-day1.314.567.178.9210.712.513.916.118.020.222.826.830.310.211.297-0.2095 1.00
60-day1.314.568.3710.612.714.816.418.720.823.125.629.633.012.121.540-0.1772 1.00
90% confidence intervals
Duration1-y2-y5-y10-y25-y50-y100-y200-y500-y1000-y
1-hour0.77-0.820.98-1.041.17-1.291.31-1.511.51-1.871.66-2.251.81-2.741.98-3.332.23-4.392.43-5.47
2-hour1.00-1.071.30-1.391.57-1.731.76-2.022.02-2.502.22-2.962.42-3.502.63-4.182.92-5.353.15-6.52
3-hour1.17-1.241.50-1.601.83-2.012.08-2.412.41-3.102.68-3.782.98-4.693.30-5.823.74-7.964.13-10.11
6-hour1.64-1.711.97-2.082.33-2.562.62-3.073.06-4.073.44-5.173.87-6.744.37-9.065.16-13.555.83-18.60
12-hour2.12-2.212.50-2.632.92-3.213.27-3.793.78-4.984.22-6.344.73-8.385.32-11.376.25-17.457.07-24.38
1-day2.42-2.553.00-3.203.60-3.994.06-4.744.72-6.155.27-7.695.89-9.766.57-12.767.54-18.278.33-24.26
2-day2.72-2.883.44-3.714.21-4.744.83-5.755.74-7.756.52-9.907.39-12.968.35-17.139.85-25.2111.12-34.09
3-day2.91-3.083.68-3.944.49-5.025.15-6.066.07-8.046.88-10.297.79-13.428.82-17.7210.39-26.0811.75-35.35
4-day3.16-3.313.86-4.104.63-5.125.25-6.156.20-8.187.01-10.457.96-13.609.02-18.1510.62-27.1811.98-36.97
7-day3.75-3.934.58-4.855.46-6.056.19-7.247.22-9.568.07-12.029.08-15.4010.17-20.0811.77-29.3513.18-39.89
10-day4.18-4.395.13-5.446.12-6.796.90-8.088.07-10.569.06-13.1310.13-16.7611.31-21.8713.02-31.5714.45-41.99
20-day5.51-5.806.80-7.218.06-8.849.04-10.3510.41-13.1611.50-16.1712.70-20.1914.01-25.5916.00-35.0117.61-44.82
30-day6.82-7.158.30-8.769.72-10.5710.77-12.2012.21-15.0613.36-18.0414.53-21.8515.78-26.8817.47-35.9418.92-45.65
45-day8.67-9.0610.45-10.9812.08-13.0013.28-14.8014.88-17.7616.03-20.6417.31-24.1318.63-28.5520.42-36.2021.91-43.49
60-day10.26-10.7312.41-13.0114.25-15.3415.58-17.2917.31-20.4118.57-23.3819.90-26.9721.19-31.4722.88-38.9024.26-45.80

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: 09/02/2021 11:58
Elapsed time : 272.4 seconds
Developed by Mitch Heineman, Ajay Prasad, Constantine Karos, and Masoud Soltani. CDM Smith, 1991-2021