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Data as of 2025-12-31
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Built 2026-10-19 (19 October 2026)

Richardson Threshold Days by Year (USC00507977)

14 fixed thresholds counted per year at Richardson (USC00507977): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Richardson Thresholds

  • Richardson: days with a maximum temperature at or below 0 C (32 F) in 11 years, most in 1936 with 142.
  • Richardson: nights with a minimum temperature at or below 0 C (32 F) in 11 years, most in 1937 with 253.
  • Richardson: nights with a minimum temperature at or below -10 C (14 F) in 11 years, most in 1939 with 166.
  • Richardson: nights with a minimum temperature at or below -20 C (-4 F) in 11 years, most in 1939 with 113.
  • 14 fixed thresholds have at least one qualifying day at Richardson.
10 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 8 in 1969. 024681936: 21937: 21938: 21939: 21940: 31941: 11967: 51968: 41969: 81970: 11936193719381939194019411967196819691970
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 8 in 1969.
Days at or above 30 C (86 F) per year at Richardson
YearDaysDecade average
193622
193722
193822
193922
194032
194112
196755.7
196845.7
196985.7
197011
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). 1936: 17 June 1936 to 8 August 19361937: 11 June 1937 to 19 June 19371938: 27 June 1938 to 28 June 19381939: 19 July 1939 to 20 July 19391940: 13 July 1940 to 18 July 19401941: 22 June 1941 to 22 June 19411967: 18 June 1967 to 15 July 19671968: 23 July 1968 to 26 July 19681969: 13 June 1969 to 23 June 19691970: 28 July 1970 to 28 July 197019361938194019671969JanFebMarAprMayJunJulAugSepOctNovDec
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
19361936-06-171936-08-08
19371937-06-111937-06-19
19381938-06-271938-06-28
19391939-07-191939-07-20
19401940-07-131940-07-18
19411941-06-221941-06-22
19671967-06-181967-07-15
19681968-07-231968-07-26
19691969-06-131969-06-23
19701970-07-281970-07-28

Every Fixed Threshold

Fixed thresholds at Richardson
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days10819691
35 C (95 F): Days2119381
90 F (32.2 C): Days4319691
0 C (32 F): Ice days (max111421936129
0 C (32 F): Frost days (min112531937232
-10 C (14 F): Days with min111661939144
-20 C (-4 F): Days with min11113193982
-30 C (-22 F): Days with min1138193636
-40 C (-40 F): Days with min112119689
10 mm (0.39 in): Days with 10 mm or more rain101619378
25 mm (0.98 in): Days with 25 mm or more rain5319371
50 mm (1.97 in): Days with 50 mm or more rain1219392
10 cm (3.9 in): Days with 10 cm or more snowfall8919678
25 cm (9.8 in): Days with 25 cm or more snowfall3319681

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1936.

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 (2025-12-31).