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Built 2026-10-19 (19 October 2026)

Williamson Threshold Days by Year (USC00469610)

17 fixed thresholds counted per year at Williamson (USC00469610): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Williamson Thresholds

  • Williamson: days with 10 mm (0.39 in) or more of precipitation in 58 years, most in 1975 with 56.
  • Williamson: days with 25 mm (0.98 in) or more of precipitation in 58 years, most in 1989 with 24.
  • Williamson: days with 50 mm (1.97 in) or more of precipitation in 30 years, most in 1989 with 5.
  • Williamson: days with 10 cm (3.9 in) or more of snowfall in 24 years, most in 1971 with 4.
  • 17 fixed thresholds have at least one qualifying day at Williamson.
17 years with a qualifying day
Days at or above 30 C (86 F) per year at Williamson Days per year at Williamson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 112 in 2010. 0501001501994: 841995: 861996: 691997: 592004: 602005: 882006: 642008: 872009: 652010: 1122011: 882021: 872022: 952023: 812024: 1042025: 992026: 111199419962004200620092011202220242026
Days per year at Williamson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 112 in 2010.
Days at or above 30 C (86 F) per year at Williamson
YearDaysDecade average
19948474.5
19958674.5
19966974.5
19975974.5
20046072.8
20058872.8
20066472.8
20088772.8
20096572.8
2010112100
201188100
20218796.2
20229596.2
20238196.2
202410496.2
20259996.2
202611196.2
First to last qualifying date each year at Williamson For each year, a bar from the first to the last day at Williamson meeting 30 C (86 F). 1994: 15 April 1994 to 20 September 19941995: 10 April 1995 to 3 October 19951996: 23 April 1996 to 13 September 19961997: 19 May 1997 to 14 October 19972004: 18 April 2004 to 26 September 20042005: 7 April 2005 to 6 October 20052006: 15 April 2006 to 19 September 20062008: 11 April 2008 to 14 October 20082009: 25 April 2009 to 26 September 20092010: 2 April 2010 to 27 October 20102011: 11 April 2011 to 28 September 20112021: 28 April 2021 to 16 October 20212022: 31 March 2022 to 22 September 20222023: 5 April 2023 to 14 October 20232024: 15 April 2024 to 6 November 20242025: 20 March 2025 to 7 October 20252026: 7 March 2026 to 2 October 2026199419972006201020222025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Williamson meeting 30 C (86 F).
First to last qualifying date each year at Williamson
YearFirst dateLast date
19941994-04-151994-09-20
19951995-04-101995-10-03
19961996-04-231996-09-13
19971997-05-191997-10-14
20042004-04-182004-09-26
20052005-04-072005-10-06
20062006-04-152006-09-19
20082008-04-112008-10-14
20092009-04-252009-09-26
20102010-04-022010-10-27
20112011-04-112011-09-28
20212021-04-282021-10-16
20222022-03-312022-09-22
20232023-04-052023-10-14
20242024-04-152024-11-06
20252025-03-202025-10-07
20262026-03-072026-10-02

Every Fixed Threshold

Fixed thresholds at Williamson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days171122010111
35 C (95 F): Days1528202419
40 C (104 F): Days1119941
90 F (32.2 C): Days1776201072
100 F (37.8 C): Days5319952
0 C (32 F): Ice days (max172320109
0 C (32 F): Frost days (min16104202258
-10 C (14 F): Days with min1316202510
-20 C (-4 F): Days with min1319963
20 C (68 F): Tropical nights (min1654202560
10 mm (0.39 in): Days with 10 mm or more rain5856197532
25 mm (0.98 in): Days with 25 mm or more rain582419897
50 mm (1.97 in): Days with 50 mm or more rain30519891
100 mm (3.94 in): Days with 100 mm or more rain2119911
10 cm (3.9 in): Days with 10 cm or more snowfall24419712
25 cm (9.8 in): Days with 25 cm or more snowfall4119941
50 cm (19.7 in): Days with 50 cm or more snowfall1120091

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1994.

Download the Data

  • Data for Williamson 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).