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Built 2026-10-19 (19 October 2026)

Safe Harbor Dam Threshold Days by Year (USC00367732)

17 fixed thresholds counted per year at Safe Harbor Dam (USC00367732): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Safe Harbor Dam Thresholds

  • Safe Harbor Dam: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 2018 with 56.
  • Safe Harbor Dam: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 2018 with 22.
  • Safe Harbor Dam: days with 50 mm (1.97 in) or more of precipitation in 29 years, most in 2013 with 6.
  • Safe Harbor Dam: days with a maximum temperature at or above 30 C (86 F) in 25 years, most in 2010 with 74.
  • 17 fixed thresholds have at least one qualifying day at Safe Harbor Dam.
25 years with a qualifying day
Days at or above 30 C (86 F) per year at Safe Harbor Dam Days per year at Safe Harbor Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 74 in 2010. 0204060802002: 612003: 312004: 272005: 592006: 462007: 552008: 542009: 322010: 742011: 522012: 602013: 462014: 272015: 452016: 612017: 452018: 512019: 582020: 572021: 552022: 532023: 432024: 472025: 432026: 48200220052008201120142017202020232026
Days per year at Safe Harbor Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 74 in 2010.
Days at or above 30 C (86 F) per year at Safe Harbor Dam
YearDaysDecade average
20026145.6
20033145.6
20042745.6
20055945.6
20064645.6
20075545.6
20085445.6
20093245.6
20107451.9
20115251.9
20126051.9
20134651.9
20142751.9
20154551.9
20166151.9
20174551.9
20185151.9
20195851.9
20205749.4
20215549.4
20225349.4
20234349.4
20244749.4
20254349.4
20264849.4
First to last qualifying date each year at Safe Harbor Dam For each year, a bar from the first to the last day at Safe Harbor Dam meeting 30 C (86 F). 2002: 17 April 2002 to 10 September 20022003: 25 June 2003 to 31 August 20032004: 20 April 2004 to 29 August 20042005: 6 June 2005 to 24 September 20052006: 31 May 2006 to 30 August 20062007: 24 April 2007 to 10 October 20072008: 8 June 2008 to 15 September 20082009: 26 April 2009 to 30 August 20092010: 7 April 2010 to 26 September 20102011: 31 May 2011 to 27 August 20112012: 17 April 2012 to 8 September 20122013: 11 April 2013 to 13 September 20132014: 28 May 2014 to 7 September 20142015: 13 May 2015 to 10 September 20152016: 27 May 2016 to 15 September 20162017: 18 May 2017 to 28 September 20172018: 3 May 2018 to 7 September 20182019: 29 May 2019 to 3 October 20192020: 16 May 2020 to 30 August 20202021: 29 April 2021 to 16 September 20212022: 22 May 2022 to 5 September 20222023: 2 June 2023 to 9 September 20232024: 30 April 2024 to 2 September 20242025: 5 June 2025 to 18 August 20252026: 15 April 2026 to 11 September 20262002200620102014201820222026JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Safe Harbor Dam meeting 30 C (86 F).
First to last qualifying date each year at Safe Harbor Dam
YearFirst dateLast date
20022002-04-172002-09-10
20032003-06-252003-08-31
20042004-04-202004-08-29
20052005-06-062005-09-24
20062006-05-312006-08-30
20072007-04-242007-10-10
20082008-06-082008-09-15
20092009-04-262009-08-30
20102010-04-072010-09-26
20112011-05-312011-08-27
20122012-04-172012-09-08
20132013-04-112013-09-13
20142014-05-282014-09-07
20152015-05-132015-09-10
20162016-05-272016-09-15
20172017-05-182017-09-28
20182018-05-032018-09-07
20192019-05-292019-10-03
20202020-05-162020-08-30
20212021-04-292021-09-16
20222022-05-222022-09-05
20232023-06-022023-09-09
20242024-04-302024-09-02
20252025-06-052025-08-18
20262026-04-152026-09-11

Every Fixed Threshold

Fixed thresholds at Safe Harbor Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days2574201048
35 C (95 F): Days201520106
40 C (104 F): Days1120111
90 F (32.2 C): Days2541200218
100 F (37.8 C): Days6320113
0 C (32 F): Ice days (max2529200320
0 C (32 F): Frost days (min25105201466
-10 C (14 F): Days with min1927201416
20 C (68 F): Tropical nights (min2565202057
25 C (77 F): Days with min12520022
10 mm (0.39 in): Days with 10 mm or more rain3256201836
25 mm (0.98 in): Days with 25 mm or more rain322220188
50 mm (1.97 in): Days with 50 mm or more rain29620131
100 mm (3.94 in): Days with 100 mm or more rain7220111
10 cm (3.9 in): Days with 10 cm or more snowfall19420051
25 cm (9.8 in): Days with 25 cm or more snowfall6220101
50 cm (19.7 in): Days with 50 cm or more snowfall1120031

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2002.

Download the Data

  • 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 2026-10-17 (17 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2026-10-17).