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Safe Harbor Dam Weather Records (USC00367732)

Record envelope, standing records and threshold days for Safe Harbor Dam (USC00367732), Pennsylvania, United States, with 79 years of record.

Key Facts for Safe Harbor Dam

  • Safe Harbor Dam (USC00367732) is a weather station in Pennsylvania, United States at 39.93 latitude and -76.39 longitude, 59 m (195 ft) above sea level.
  • The station reports from 1948 to 2026, 79 years of record.
  • 1,464 records set at Safe Harbor Dam still stand.
  • Records are tracked for prcp, snow: an element needs 30 years of data to be eligible.
  • Safe Harbor Dam set a daily record precipitation of 69.9 mm (2.8 in) on 12 October 2026 (provisional).

Provisional Records

Records set in the last 60 days are provisional until they clear the revision window.

About the Station

  • Location: Pennsylvania, United States, 39.93 latitude, -76.39 longitude.
  • Elevation: 59 m (195 ft).
  • Period of record: 1948 to 2026, 79 years.
  • Eligible elements: prcp, snow.

Daily Record Envelope and 2026

28 days at or beyond a record
Daily record high and record low at Safe Harbor Dam, with 2026 drawn through them The band shows the record high and record low for each calendar day at Safe Harbor Dam. The lines show the 2026 daily maximum and minimum. 28 days in 2026 matched or passed a record. Temperatures are in degrees Celsius. -200204060 JanFebMarAprMayJunJulAugSepOctNovDec
The band shows the record high and record low for each calendar day at Safe Harbor Dam. The lines show the 2026 daily maximum and minimum. 28 days in 2026 matched or passed a record. Temperatures are in degrees Celsius.
Daily record high and record low at Safe Harbor Dam, with 2026 drawn through them
MonthHighest record highLowest record low2026 highest maximum2026 lowest minimum
Jan19.4 C (66.9 F)-16.1 C (3.0 F)12.8 C (55.0 F)-13.3 C (8.1 F)
Feb23.9 C (75.0 F)-17.2 C (1.0 F)12.8 C (55.0 F)-13.3 C (8.1 F)
Mar26.1 C (79.0 F)-13.3 C (8.1 F)26.1 C (79.0 F)-4.4 C (24.1 F)
Apr33.9 C (93.0 F)-2.8 C (27.0 F)31.7 C (89.1 F)-1.7 C (28.9 F)
May36.7 C (98.1 F)-1.1 C (30.0 F)33.9 C (93.0 F)6.1 C (43.0 F)
Jun36.7 C (98.1 F)7.8 C (46.0 F)35.0 C (95.0 F)11.1 C (52.0 F)
Jul40.6 C (105.1 F)13.3 C (55.9 F)39.4 C (102.9 F)15.0 C (59.0 F)
Aug37.8 C (100.0 F)11.1 C (52.0 F)32.2 C (90.0 F)16.7 C (62.1 F)
Sep35.6 C (96.1 F)6.1 C (43.0 F)34.4 C (93.9 F)9.4 C (48.9 F)
Oct32.2 C (90.0 F)-1.1 C (30.0 F)29.4 C (84.9 F)8.3 C (46.9 F)
Nov26.7 C (80.1 F)-7.8 C (18.0 F)n/an/a
Dec22.8 C (73.0 F)-15.0 C (5.0 F)n/an/a

Which Years Hold Standing Records

1,464 standing records
Standing records at Safe Harbor Dam by the year they were set 1,464 records at Safe Harbor Dam still stand. 2002 holds the most, with 88. 02550751001995: 631996: 812001: 72002: 882003: 512004: 602005: 602006: 522007: 642008: 512009: 452010: 572011: 622012: 572013: 472014: 642015: 772016: 422017: 632018: 542019: 372020: 412021: 382022: 382023: 412024: 512025: 352026: 381995200220052008201120142017202020232026
1,464 records at Safe Harbor Dam still stand. 2002 holds the most, with 88.
Standing records at Safe Harbor Dam by the year they were set
Year setStanding records
199563
199681
20017
200288
200351
200460
200560
200652
200764
200851
200945
201057
201162
201257
201347
201464
201577
201642
201763
201854
201937
202041
202138
202238
202341
202451
202535
202638

Wettest Day of Each Month

Oct: 141.2 mm (5.6 in)
Record daily precipitation for each month at Safe Harbor Dam The wettest day on record for each calendar month at Safe Harbor Dam. The most was 141.2 mm (5.6 in) on 1 October 2010. 050100150 Jan: 85.3 mm (3.4 in), 31 January 2013 Jan Feb: 45.5 mm (1.8 in), 17 February 2003 Feb Mar: 88.6 mm (3.5 in), 22 March 2019 Mar Apr: 62.0 mm (2.4 in), 23 April 2006 Apr May: 75.2 mm (3.0 in), 30 May 1948 May Jun: 115.6 mm (4.6 in), 28 June 2006 Jun Jul: 85.3 mm (3.4 in), 30 July 2007 Jul Aug: 118.4 mm (4.7 in), 28 August 2011 Aug Sep: 136.7 mm (5.4 in), 2 September 2021 Sep Oct: 141.2 mm (5.6 in), 1 October 2010 Oct Nov: 94.7 mm (3.7 in), 28 November 1993 Nov Dec: 79.8 mm (3.1 in), 18 December 2023 Dec
The wettest day on record for each calendar month at Safe Harbor Dam. The most was 141.2 mm (5.6 in) on 1 October 2010.
Record daily precipitation for each month at Safe Harbor Dam
MonthRecord daily precipitation (mm)Date
Jan85.3 mm (3.4 in)31 January 2013
Feb45.5 mm (1.8 in)17 February 2003
Mar88.6 mm (3.5 in)22 March 2019
Apr62.0 mm (2.4 in)23 April 2006
May75.2 mm (3.0 in)30 May 1948
Jun115.6 mm (4.6 in)28 June 2006
Jul85.3 mm (3.4 in)30 July 2007
Aug118.4 mm (4.7 in)28 August 2011
Sep136.7 mm (5.4 in)2 September 2021
Oct141.2 mm (5.6 in)1 October 2010
Nov94.7 mm (3.7 in)28 November 1993
Dec79.8 mm (3.1 in)18 December 2023

Period of Record Coverage

1995 to 2026
Days with data per year at Safe Harbor Dam 28 years of record at Safe Harbor Dam, 1995 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1995, 1996, 2001, 2026. 1995: 299 of 365 days1996: 298 of 366 days2001: 29 of 365 days2002: 362 of 365 days2003: 363 of 365 days2004: 365 of 366 days2005: 365 of 365 days2006: 364 of 365 days2007: 365 of 365 days2008: 365 of 366 days2009: 365 of 365 days2010: 365 of 365 days2011: 365 of 365 days2012: 366 of 366 days2013: 365 of 365 days2014: 365 of 365 days2015: 365 of 365 days2016: 366 of 366 days2017: 365 of 365 days2018: 365 of 365 days2019: 365 of 365 days2020: 366 of 366 days2021: 365 of 365 days2022: 365 of 365 days2023: 365 of 365 days2024: 366 of 366 days2025: 365 of 365 days2026: 286 of 365 days199520052010201520202025
28 years of record at Safe Harbor Dam, 1995 to 2026. 4 years have data for under 90 percent of days and are left out of rankings: 1995, 1996, 2001, 2026.
Days with data per year at Safe Harbor Dam
YearDays with dataShare of yearComplete
199529982%No
199629881%No
2001298%No
200236299%Yes
200336399%Yes
2004365100%Yes
2005365100%Yes
2006364100%Yes
2007365100%Yes
2008365100%Yes
2009365100%Yes
2010365100%Yes
2011365100%Yes
2012366100%Yes
2013365100%Yes
2014365100%Yes
2015365100%Yes
2016366100%Yes
2017365100%Yes
2018365100%Yes
2019365100%Yes
2020366100%Yes
2021365100%Yes
2022365100%Yes
2023365100%Yes
2024366100%Yes
2025365100%Yes
202628678%No

Latest Records

20
Latest records at Safe Harbor Dam
DateStationRecordValueBeat old record byOld record stoodSignificance
12 October 2026Safe Harbor Dam, USdaily rain (Provisional)69.9 mm (2.8 in)5.4 mm (0.21 in)12 years12 of 100 (Routine)
3 September 2026Safe Harbor Dam, USdaily rain (Provisional)31.0 mm (1.2 in)11.2 mm (0.4 in)7 years14 of 100 (Routine)
31 August 2026Safe Harbor Dam, USdaily rain (Provisional)17.3 mm (0.7 in)3.1 mm (0.12 in)4 years10 of 100 (Routine)
9 August 2026Safe Harbor Dam, USdaily rain16.0 mm (0.6 in)6.1 mm (0.24 in)1 year11 of 100 (Routine)
6 July 2026Safe Harbor Dam, USdaily rain32.8 mm (1.3 in)4.6 mm (0.18 in)4 years11 of 100 (Routine)
24 May 2026Safe Harbor Dam, USdaily rain28.2 mm (1.1 in)8.9 mm (0.35 in)13 years19 of 100 (Routine)
20 February 2026Safe Harbor Dam, USdaily rain11.4 mm (0.4 in)6.8 mm (0.27 in)12 years17 of 100 (Routine)
26 January 2026Safe Harbor Dam, USdaily rain36.8 mm (1.4 in)21.8 mm (0.9 in)3 years29 of 100 (Routine)
25 January 2026Safe Harbor Dam, USdaily snowfall5.8 cm (2.3 in)5.8 cm (2.3 in)32 years22 of 100 (Routine)
18 January 2026Safe Harbor Dam, USdaily snowfall6.1 cm (2.4 in)0.3 cm (0.1 in)15 years11 of 100 (Routine)
1 January 2026Safe Harbor Dam, USdaily snowfall1.3 cm (0.5 in)1.3 cm (0.5 in)32 years17 of 100 (Routine)
19 December 2025Safe Harbor Dam, USdaily rain11.2 mm (0.4 in)2.8 mm (0.11 in)30 years18 of 100 (Routine)
20 October 2025Safe Harbor Dam, USdaily rain13.2 mm (0.5 in)1.3 mm (0.05 in)12 years10 of 100 (Routine)
14 October 2025Safe Harbor Dam, USdaily rain25.1 mm (1.0 in)4.3 mm (0.17 in)20 years15 of 100 (Routine)
5 September 2025Safe Harbor Dam, USdaily rain10.2 mm (0.4 in)3.3 mm (0.13 in)14 years12 of 100 (Routine)
17 July 2025Safe Harbor Dam, USdaily rain16.8 mm (0.7 in)0.8 mm (0.03 in)20 years13 of 100 (Routine)
15 July 2025Safe Harbor Dam, USdaily rain79.8 mm (3.1 in)26.5 mm (1.0 in)15 years30 of 100 (Routine)
10 July 2025Safe Harbor Dam, USdaily rain46.2 mm (1.8 in)22.6 mm (0.9 in)15 years27 of 100 (Routine)
1 July 2025Safe Harbor Dam, USdaily rain50.0 mm (2.0 in)3.5 mm (0.14 in)12 years12 of 100 (Routine)
20 June 2025Safe Harbor Dam, USdaily rain19.8 mm (0.8 in)6.8 mm (0.27 in)32 years20 of 100 (Routine)

Climate Trend

24 complete years, 2002 to 2025
Annual mean temperature at Safe Harbor Dam as warming stripes, 2002 to 2025 One stripe for each of 24 complete years at Safe Harbor Dam, 2002 to 2025. Blue stripes are years cooler than the station's own mean of 12.9 C (55.2 F); red stripes are warmer. The coolest year was 2014, at 11.4 C (52.5 F), and the warmest was 2012, at 13.8 C (56.8 F). The strongest colour marks a difference of 1.5 C (2.7 F). 2002: 13.3 C, +0.4 C from the station mean2003: 11.6 C, -1.3 C from the station mean2004: 12.4 C, -0.5 C from the station mean2005: 12.7 C, -0.2 C from the station mean2006: 13.5 C, +0.6 C from the station mean2007: 12.7 C, -0.2 C from the station mean2008: 12.7 C, -0.2 C from the station mean2009: 12.3 C, -0.6 C from the station mean2010: 13.4 C, +0.5 C from the station mean2011: 13.2 C, +0.3 C from the station mean2012: 13.8 C, +0.9 C from the station mean2013: 12.3 C, -0.5 C from the station mean2014: 11.4 C, -1.5 C from the station mean2015: 12.5 C, -0.4 C from the station mean2016: 13.3 C, +0.4 C from the station mean2017: 13.2 C, +0.3 C from the station mean2018: 12.6 C, -0.3 C from the station mean2019: 13.0 C, +0.1 C from the station mean2020: 13.5 C, +0.6 C from the station mean2021: 13.4 C, +0.5 C from the station mean2022: 12.7 C, -0.1 C from the station mean2023: 13.6 C, +0.7 C from the station mean2024: 13.7 C, +0.8 C from the station mean2025: 12.6 C, -0.3 C from the station mean200220042006200820102012201420162018202020222024
One stripe for each of 24 complete years at Safe Harbor Dam, 2002 to 2025. Blue stripes are years cooler than the station's own mean of 12.9 C (55.2 F); red stripes are warmer. The coolest year was 2014, at 11.4 C (52.5 F), and the warmest was 2012, at 13.8 C (56.8 F). The strongest colour marks a difference of 1.5 C (2.7 F).
Annual mean temperature at Safe Harbor Dam as warming stripes, 2002 to 2025
YearAnnual mean temperatureDifference from the station mean
200213.3 C+0.38 C
200311.6 C-1.27 C
200412.4 C-0.51 C
200512.7 C-0.22 C
200613.5 C+0.63 C
200712.7 C-0.19 C
200812.7 C-0.22 C
200912.3 C-0.55 C
201013.4 C+0.47 C
201113.2 C+0.29 C
201213.8 C+0.90 C
201312.3 C-0.54 C
201411.4 C-1.49 C
201512.5 C-0.36 C
201613.3 C+0.41 C
201713.2 C+0.32 C
201812.6 C-0.30 C
201913.0 C+0.11 C
202013.5 C+0.57 C
202113.4 C+0.50 C
202212.7 C-0.14 C
202313.6 C+0.74 C
202413.7 C+0.83 C
202512.6 C-0.28 C

This station does not have enough complete years (30 are needed) to fit a temperature trend.

A year is complete when all 12 months have at least 20 days of both daily maximum and daily minimum readings. The annual mean is the mean of the monthly means. The trend describes this one station over this period; it does not say what caused the change.

Extremes by Year

1948 to 2026
Yearly extremes at Safe Harbor Dam: the record and the median year
MeasureRecordYear of the recordMedian yearYears with a value
Hottest day (TXx)40.6 C (105.1 F)201136.1 C (97.0 F)28
Coldest night (TNn)-17.2 C (1.0 F)1996-13.0 C (8.5 F)28
Wettest day (Rx1day)141.2 mm (5.6 in)201079.8 mm (3.1 in)35
Wettest five days (Rx5day)286.5 mm (11.3 in)2006102.2 mm (4.0 in)35
Longest dry spell (CDD)40 days202417 days35

Hottest day (TXx)

Hottest day (TXx) at Safe Harbor Dam by year The hottest day of the year at Safe Harbor Dam, 1948 to 2026. The record is 40.6 C (105.1 F) in 2011, marked on the chart; the median year is 36.1 C (97.0 F). 2025303540451960198020002020Record: 40.6 C (105.1 F) in 2011
The hottest day of the year at Safe Harbor Dam, 1948 to 2026. The record is 40.6 C (105.1 F) in 2011, marked on the chart; the median year is 36.1 C (97.0 F).
Hottest day (TXx) at Safe Harbor Dam by year
YearHottest day (TXx)
1948n/a
1993n/a
1994n/a
199535.0 C (95.0 F)
199636.7 C (98.1 F)
1997n/a
1998n/a
1999n/a
2000n/a
200122.2 C (72.0 F)
200237.8 C (100.0 F)
200333.9 C (93.0 F)
200432.8 C (91.0 F)
200536.1 C (97.0 F)
200637.2 C (99.0 F)
200736.1 C (97.0 F)
200835.6 C (96.1 F)
200935.0 C (95.0 F)
201037.8 C (100.0 F)
201140.6 C (105.1 F)
201238.9 C (102.0 F)
201336.7 C (98.1 F)
201433.9 C (93.0 F)
201534.4 C (93.9 F)
201636.1 C (97.0 F)
201734.4 C (93.9 F)
201835.0 C (95.0 F)
201936.7 C (98.1 F)
202036.1 C (97.0 F)
202136.1 C (97.0 F)
202235.0 C (95.0 F)
202335.0 C (95.0 F)
202437.8 C (100.0 F)
202536.7 C (98.1 F)
202639.4 C (102.9 F)

Coldest night (TNn)

Coldest night (TNn) at Safe Harbor Dam by year The coldest night of the year at Safe Harbor Dam, 1948 to 2026. The record is -17.2 C (1.0 F) in 1996, marked on the chart; the median year is -13.0 C (8.5 F). -17.5-15-12.5-10-7.5-51960198020002020Record: -17.2 C (1.0 F) in 1996
The coldest night of the year at Safe Harbor Dam, 1948 to 2026. The record is -17.2 C (1.0 F) in 1996, marked on the chart; the median year is -13.0 C (8.5 F).
Coldest night (TNn) at Safe Harbor Dam by year
YearColdest night (TNn)
1948n/a
1993n/a
1994n/a
1995-10.6 C (12.9 F)
1996-17.2 C (1.0 F)
1997n/a
1998n/a
1999n/a
2000n/a
2001-7.2 C (19.0 F)
2002-9.4 C (15.1 F)
2003-12.8 C (9.0 F)
2004-16.1 C (3.0 F)
2005-13.9 C (7.0 F)
2006-9.4 C (15.1 F)
2007-13.3 C (8.1 F)
2008-11.7 C (10.9 F)
2009-13.3 C (8.1 F)
2010-9.4 C (15.1 F)
2011-15.6 C (3.9 F)
2012-10.6 C (12.9 F)
2013-11.7 C (10.9 F)
2014-16.1 C (3.0 F)
2015-16.7 C (1.9 F)
2016-15.0 C (5.0 F)
2017-11.1 C (12.0 F)
2018-14.4 C (6.1 F)
2019-15.6 C (3.9 F)
2020-9.4 C (15.1 F)
2021-7.2 C (19.0 F)
2022-15.0 C (5.0 F)
2023-9.4 C (15.1 F)
2024-11.1 C (12.0 F)
2025-15.0 C (5.0 F)
2026-13.3 C (8.1 F)

Wettest day (Rx1day)

Wettest day (Rx1day) at Safe Harbor Dam by year The wettest day of the year at Safe Harbor Dam, 1948 to 2026. The record is 141.2 mm (5.6 in) in 2010, marked on the chart; the median year is 79.8 mm (3.1 in). 0501001501960198020002020Record: 141.2 mm (5.6 in) in 2010
The wettest day of the year at Safe Harbor Dam, 1948 to 2026. The record is 141.2 mm (5.6 in) in 2010, marked on the chart; the median year is 79.8 mm (3.1 in).
Wettest day (Rx1day) at Safe Harbor Dam by year
YearWettest day (Rx1day)
194875.2 mm (3.0 in)
199394.7 mm (3.7 in)
199453.3 mm (2.1 in)
199563.8 mm (2.5 in)
199669.3 mm (2.7 in)
199738.6 mm (1.5 in)
199841.7 mm (1.6 in)
1999123.2 mm (4.9 in)
200086.6 mm (3.4 in)
200144.7 mm (1.8 in)
200252.1 mm (2.1 in)
200389.4 mm (3.5 in)
200462.0 mm (2.4 in)
200593.5 mm (3.7 in)
2006115.6 mm (4.6 in)
200785.3 mm (3.4 in)
2008113.8 mm (4.5 in)
200986.9 mm (3.4 in)
2010141.2 mm (5.6 in)
2011118.4 mm (4.7 in)
201299.8 mm (3.9 in)
201388.1 mm (3.5 in)
201466.3 mm (2.6 in)
201559.2 mm (2.3 in)
201667.1 mm (2.6 in)
201753.3 mm (2.1 in)
2018105.9 mm (4.2 in)
201988.6 mm (3.5 in)
202057.9 mm (2.3 in)
2021136.7 mm (5.4 in)
202281.0 mm (3.2 in)
202379.8 mm (3.1 in)
202462.2 mm (2.4 in)
202579.8 mm (3.1 in)
202669.9 mm (2.8 in)

Wettest five days (Rx5day)

Wettest five days (Rx5day) at Safe Harbor Dam by year The wettest five days of the year at Safe Harbor Dam, 1948 to 2026. The record is 286.5 mm (11.3 in) in 2006, marked on the chart; the median year is 102.2 mm (4.0 in). 01002003001960198020002020Record: 286.5 mm (11.3 in) in 2006
The wettest five days of the year at Safe Harbor Dam, 1948 to 2026. The record is 286.5 mm (11.3 in) in 2006, marked on the chart; the median year is 102.2 mm (4.0 in).
Wettest five days (Rx5day) at Safe Harbor Dam by year
YearWettest five days (Rx5day)
194878.5 mm (3.1 in)
199393.0 mm (3.7 in)
199455.1 mm (2.2 in)
199591.7 mm (3.6 in)
199683.5 mm (3.3 in)
199761.6 mm (2.4 in)
199877.4 mm (3.0 in)
1999172.2 mm (6.8 in)
2000102.2 mm (4.0 in)
200153.9 mm (2.1 in)
200292.2 mm (3.6 in)
2003141.7 mm (5.6 in)
200475.3 mm (3.0 in)
2005183.4 mm (7.2 in)
2006286.5 mm (11.3 in)
2007132.5 mm (5.2 in)
2008127.7 mm (5.0 in)
2009119.0 mm (4.7 in)
2010210.7 mm (8.3 in)
2011210.9 mm (8.3 in)
2012122.7 mm (4.8 in)
2013186.6 mm (7.3 in)
2014114.4 mm (4.5 in)
2015102.0 mm (4.0 in)
201699.6 mm (3.9 in)
201789.9 mm (3.5 in)
2018167.8 mm (6.6 in)
201998.0 mm (3.9 in)
2020115.0 mm (4.5 in)
2021160.6 mm (6.3 in)
2022136.5 mm (5.4 in)
202379.8 mm (3.1 in)
2024131.3 mm (5.2 in)
202597.9 mm (3.9 in)
202679.8 mm (3.1 in)

Longest dry spell (CDD)

Longest dry spell (CDD) at Safe Harbor Dam by year The longest dry spell of the year at Safe Harbor Dam, 1948 to 2026. The record is 40 days in 2024, marked on the chart; the median year is 17 days. 0102030401960198020002020Record: 40 days in 2024
The longest dry spell of the year at Safe Harbor Dam, 1948 to 2026. The record is 40 days in 2024, marked on the chart; the median year is 17 days.
Longest dry spell (CDD) at Safe Harbor Dam by year
YearLongest dry spell (CDD)
19488 days
199310 days
19945 days
199527 days
199610 days
199716 days
199817 days
199917 days
200021 days
200133 days
200219 days
200313 days
200417 days
200520 days
200622 days
200724 days
200823 days
200913 days
201020 days
201115 days
201216 days
201315 days
201411 days
201518 days
201616 days
201721 days
201811 days
201920 days
202014 days
202117 days
202210 days
202320 days
202440 days
202517 days
202620 days

Each chart shows one value per year; the dot marks the record year. TXx is the hottest daily maximum, TNn the coldest daily minimum, Rx1day and Rx5day the largest one-day and five-day rain totals, and CDD the longest run of days with less than 1 mm of rain. A year with missing days can understate an extreme.

Frost Dates and Growing Season

24 years with a frost

Across 24 years with a frost, the median last spring frost at Safe Harbor Dam falls on 3 April and the median first autumn frost on 14 November, which leaves a median of 224 days between them.

Frost dates and growing season at Safe Harbor Dam
MeasureMedian, all yearsEarliest periodRecent period (2002 to 2025)Recent against earliestFitted trend
Last spring frost3 Apriln/a3 Apriln/an/a
First autumn frost14 Novembern/a14 Novembern/an/a
Growing days224 daysn/a224 daysn/an/a

A frost day is a day with a daily minimum at or below 0 C (32 F). The last spring frost and the first autumn frost are the last and first such days of the cold season, and growing days are the days between them. A negative trend for the last spring frost means it comes earlier.

Rainfall Return Levels

31 years, 1995 to 2025

A day with at least 79.3 mm (3.1 in) of rain is expected about once in 2 years. A day with at least 160.3 mm (6.3 in) of rain is expected about once in 100 years.

Rainfall return levels at Safe Harbor Dam: the daily rain expected about once in a given number of years
Expected about once inA day with at leastNote
2 years79.3 mm (3.1 in)
5 years104.7 mm (4.1 in)
10 years119.9 mm (4.7 in)
25 years137.4 mm (5.4 in)
50 years149.4 mm (5.9 in)Longer than the 31 years of record
100 years160.3 mm (6.3 in)Longer than the 31 years of record

The levels come from a generalised extreme value (GEV) distribution fitted by L-moments to the wettest-day total of each year, 31 years of values from 1995 to 2025.

A return level is an estimate. It is least reliable for the long periods, 50 and 100 years, and for any period longer than the record behind the fit, where the fit has to reach past the largest day actually observed. It is not a forecast.

The largest wettest-day totals in the fit: 141.2 mm (5.6 in) in 2010; 136.7 mm (5.4 in) in 2021; 123.2 mm (4.9 in) in 1999.

Download the Data

  • Data for Safe Harbor Dam standing records by year: CSV or JSON. Field meanings are on the data page.
  • Data for Safe Harbor Dam threshold days by year: CSV or JSON. Field meanings are on the data page.

Source: NOAA National Centers for Environmental Information, Global Historical Climatology Network Daily (GHCN-Daily). Records are computed by World Extreme Weather Monitor and are not official NOAA products. (US Government open data (NOAA NCEI)) Data as of 2026-10-15 (15 October 2026). Records are computed by this site and are not official.

Data as of . Last revised (2026-10-15).