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Built 2026-10-19 (19 October 2026)

Richardson Threshold Days by Year (USC00417588)

14 fixed thresholds counted per year at Richardson (USC00417588): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Richardson Thresholds

  • Richardson: days with 10 mm (0.39 in) or more of precipitation in 73 years, most in 2007 with 50.
  • Richardson: days with 25 mm (0.98 in) or more of precipitation in 73 years, most in 2015 with 26.
  • Richardson: days with 50 mm (1.97 in) or more of precipitation in 69 years, most in 2018 with 11.
  • Richardson: days with 100 mm (3.94 in) or more of precipitation in 21 years, most in 1969 with 2.
  • 14 fixed thresholds have at least one qualifying day at Richardson.
20 years with a qualifying day
Days at or above 30 C (86 F) per year at Richardson Days per year at Richardson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 147 in 2025. 0501001502007: 1112008: 1212009: 1132010: 1272011: 1452012: 1342013: 1262014: 1192015: 1262016: 1222017: 1212018: 1232019: 1252020: 1332021: 1152022: 1392023: 1422024: 1452025: 1472026: 232007200920112013201520172019202120232025
Days per year at Richardson with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 147 in 2025.
Days at or above 30 C (86 F) per year at Richardson
YearDaysDecade average
2007111115
2008121115
2009113115
2010127126.8
2011145126.8
2012134126.8
2013126126.8
2014119126.8
2015126126.8
2016122126.8
2017121126.8
2018123126.8
2019125126.8
2020133120.6
2021115120.6
2022139120.6
2023142120.6
2024145120.6
2025147120.6
202623120.6
First to last qualifying date each year at Richardson For each year, a bar from the first to the last day at Richardson meeting 30 C (86 F). 2007: 14 May 2007 to 20 October 20072008: 9 May 2008 to 4 October 20082009: 9 April 2009 to 8 October 20092010: 5 May 2010 to 30 September 20102011: 1 April 2011 to 17 October 20112012: 1 April 2012 to 2 November 20122013: 4 March 2013 to 12 October 20132014: 27 April 2014 to 26 October 20142015: 25 April 2015 to 15 October 20152016: 14 March 2016 to 30 October 20162017: 20 March 2017 to 5 November 20172018: 6 May 2018 to 7 October 20182019: 9 April 2019 to 20 October 20192020: 25 March 2020 to 21 October 20202021: 3 May 2021 to 25 October 20212022: 27 March 2022 to 21 October 20222023: 3 April 2023 to 27 October 20232024: 26 February 2024 to 30 October 20242025: 25 March 2025 to 17 November 20252026: 20 March 2026 to 31 August 20262007201020132016201920222025JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Richardson meeting 30 C (86 F).
First to last qualifying date each year at Richardson
YearFirst dateLast date
20072007-05-142007-10-20
20082008-05-092008-10-04
20092009-04-092009-10-08
20102010-05-052010-09-30
20112011-04-012011-10-17
20122012-04-012012-11-02
20132013-03-042013-10-12
20142014-04-272014-10-26
20152015-04-252015-10-15
20162016-03-142016-10-30
20172017-03-202017-11-05
20182018-05-062018-10-07
20192019-04-092019-10-20
20202020-03-252020-10-21
20212021-05-032021-10-25
20222022-03-272022-10-21
20232023-04-032023-10-27
20242024-02-262024-10-30
20252025-03-252025-11-17
20262026-03-202026-08-31

Every Fixed Threshold

Fixed thresholds at Richardson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days20147202523
35 C (95 F): Days209120112
40 C (104 F): Days102120231
90 F (32.2 C): Days20120202412
100 F (37.8 C): Days205420112
0 C (32 F): Ice days (max18820213
0 C (32 F): Frost days (min2052200812
-10 C (14 F): Days with min12720113
20 C (68 F): Tropical nights (min20141202525
25 C (77 F): Days with min207220113
10 mm (0.39 in): Days with 10 mm or more rain7350200713
25 mm (0.98 in): Days with 25 mm or more rain732620154
50 mm (1.97 in): Days with 50 mm or more rain691120182
100 mm (3.94 in): Days with 100 mm or more rain21219691

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 2007.

Download the Data

  • Data for Richardson 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 (2026-10-12).