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Data as of 2025-12-31
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Built 2026-10-18 (18 October 2026)

White Rock Dam Threshold Days by Year

17 fixed thresholds counted per year at White Rock Dam (USC00218947): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for White Rock Dam Thresholds

  • White Rock Dam: days with 10 mm (0.39 in) or more of precipitation in 22 years, most in 2019 with 26.
  • White Rock Dam: days with 25 mm (0.98 in) or more of precipitation in 22 years, most in 2005 with 10.
  • White Rock Dam: days with a maximum temperature at or above 30 C (86 F) in 17 years, most in 2012 with 38.
  • White Rock Dam: days with a maximum temperature at or above 90 F (32.2 C) in 17 years, most in 2006 with 18.
  • 17 fixed thresholds have at least one qualifying day at White Rock Dam.
17 years with a qualifying day
Days at or above 30 C (86 F) per year at White Rock Dam Days per year at White Rock Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2012. 0102030402004: 122005: 302006: 332007: 322008: 172009: 102010: 232011: 342012: 382013: 332014: 102015: 232016: 252017: 212019: 192021: 382025: 13200420062008201020122014201620192025
Days per year at White Rock Dam with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 38 in 2012.
Days at or above 30 C (86 F) per year at White Rock Dam
YearDaysDecade average
20041222.3
20053022.3
20063322.3
20073222.3
20081722.3
20091022.3
20102325.1
20113425.1
20123825.1
20133325.1
20141025.1
20152325.1
20162525.1
20172125.1
20191925.1
20213825.5
20251325.5
First to last qualifying date each year at White Rock Dam For each year, a bar from the first to the last day at White Rock Dam meeting 30 C (86 F). 2004: 29 April 2004 to 20 September 20042005: 20 June 2005 to 2 October 20052006: 24 May 2006 to 15 September 20062007: 11 June 2007 to 7 October 20072008: 25 June 2008 to 2 September 20082009: 19 May 2009 to 15 August 20092010: 25 May 2010 to 31 August 20102011: 31 May 2011 to 6 October 20112012: 15 May 2012 to 1 October 20122013: 14 May 2013 to 19 September 20132014: 25 May 2014 to 22 July 20142015: 3 May 2015 to 12 October 20152016: 6 May 2016 to 30 August 20162017: 15 May 2017 to 23 September 20172019: 31 May 2019 to 21 September 20192021: 2 May 2021 to 29 September 20212025: 13 May 2025 to 5 October 2025200420072010201320162021JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at White Rock Dam meeting 30 C (86 F).
First to last qualifying date each year at White Rock Dam
YearFirst dateLast date
20042004-04-292004-09-20
20052005-06-202005-10-02
20062006-05-242006-09-15
20072007-06-112007-10-07
20082008-06-252008-09-02
20092009-05-192009-08-15
20102010-05-252010-08-31
20112011-05-312011-10-06
20122012-05-152012-10-01
20132013-05-142013-09-19
20142014-05-252014-07-22
20152015-05-032015-10-12
20162016-05-062016-08-30
20172017-05-152017-09-23
20192019-05-312019-09-21
20212021-05-022021-09-29
20252025-05-132025-10-05

Every Fixed Threshold

Fixed thresholds at White Rock Dam
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days1738201213
35 C (95 F): Days10720067
90 F (32.2 C): Days171820066
100 F (37.8 C): Days2220061
0 C (32 F): Ice days (max17118201356
0 C (32 F): Frost days (min161952013144
-10 C (14 F): Days with min16115201369
-20 C (-4 F): Days with min1653200935
-30 C (-22 F): Days with min12720102
20 C (68 F): Tropical nights (min151420132
25 C (77 F): Days with min1120121
10 mm (0.39 in): Days with 10 mm or more rain2226201921
25 mm (0.98 in): Days with 25 mm or more rain221020059
50 mm (1.97 in): Days with 50 mm or more rain16320211
100 mm (3.94 in): Days with 100 mm or more rain1119501
10 cm (3.9 in): Days with 10 cm or more snowfall13620094
25 cm (9.8 in): Days with 25 cm or more snowfall2220081

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2004.

Download the Data

  • Data for White Rock 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of . Last revised (2025-12-31).