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

Flat Threshold Days by Year (USC00503085)

13 fixed thresholds counted per year at Flat (USC00503085): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Flat Thresholds

  • Flat: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1938 with 254.
  • Flat: nights with a minimum temperature at or below -10 C (14 F) in 23 years, most in 1956 with 165.
  • Flat: nights with a minimum temperature at or below -20 C (-4 F) in 23 years, most in 1956 with 123.
  • Flat: nights with a minimum temperature at or below -30 C (-22 F) in 23 years, most in 1956 with 83.
  • 13 fixed thresholds have at least one qualifying day at Flat.
7 years with a qualifying day
Days at or above 30 C (86 F) per year at Flat Days per year at Flat with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 1951. 01231936: 21937: 11944: 11951: 31952: 21953: 31957: 21936193719441951195219531957
Days per year at Flat with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 3 in 1951.
Days at or above 30 C (86 F) per year at Flat
YearDaysDecade average
193621.5
193711.5
194411
195132.5
195222.5
195332.5
195722.5
First to last qualifying date each year at Flat For each year, a bar from the first to the last day at Flat meeting 30 C (86 F). 1936: 6 June 1936 to 9 June 19361937: 19 June 1937 to 19 June 19371944: 10 July 1944 to 10 July 19441951: 12 July 1951 to 14 July 19511952: 21 July 1952 to 22 July 19521953: 26 July 1953 to 28 July 19531957: 8 June 1957 to 9 June 19571936193719441951195219531957JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Flat meeting 30 C (86 F).
First to last qualifying date each year at Flat
YearFirst dateLast date
19361936-06-061936-06-09
19371937-06-191937-06-19
19441944-07-101944-07-10
19511951-07-121951-07-14
19521952-07-211952-07-22
19531953-07-261953-07-28
19571957-06-081957-06-09

Every Fixed Threshold

Fixed thresholds at Flat
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days7319512
90 F (32.2 C): Days1119511
0 C (32 F): Ice days (max221701955168
0 C (32 F): Frost days (min232541938240
-10 C (14 F): Days with min231651956158
-20 C (-4 F): Days with min231231956105
-30 C (-22 F): Days with min2383195653
-40 C (-40 F): Days with min223119567
10 mm (0.39 in): Days with 10 mm or more rain201819389
25 mm (0.98 in): Days with 25 mm or more rain9219521
50 mm (1.97 in): Days with 50 mm or more rain1119501
10 cm (3.9 in): Days with 10 cm or more snowfall10819598
25 cm (9.8 in): Days with 25 cm or more snowfall1119521

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 Flat 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).