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

Bristol Threshold Days by Year (USC00081020)

11 fixed thresholds counted per year at Bristol (USC00081020): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bristol Thresholds

  • Bristol: days with 10 mm (0.39 in) or more of precipitation in 5 years, most in 1917 with 47.
  • Bristol: days with 25 mm (0.98 in) or more of precipitation in 5 years, most in 1917 with 13.
  • Bristol: days with 50 mm (1.97 in) or more of precipitation in 5 years, most in 1917 with 5.
  • Bristol: nights with a minimum temperature at or below 0 C (32 F) in 2 years, most in 1917 with 36.
  • 11 fixed thresholds have at least one qualifying day at Bristol.
5 years with a qualifying day
Days with 10 mm (0.39 in) or more of precipitation per year at Bristol Days per year at Bristol with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 47 in 1917. 02040601916: 391917: 471918: 531949: 461950: 3619161917191819491950
Days per year at Bristol with 10 mm (0.39 in) or more of precipitation, with the decade average as a line. The most was 47 in 1917.
Days with 10 mm (0.39 in) or more of precipitation per year at Bristol
YearDaysDecade average
19163946.3
19174746.3
19185346.3
19494646
19503636
First to last qualifying date each year at Bristol For each year, a bar from the first to the last day at Bristol meeting 10 mm (0.39 in). 1916: 2 February 1916 to 29 December 19161917: 14 January 1917 to 13 December 19171918: 6 January 1918 to 30 November 19181949: 5 January 1949 to 14 December 19491950: 11 January 1950 to 29 December 195019161917191819491950JanFebMarAprMayJunJulAugSepOctNovDec
For each year, a bar from the first to the last day at Bristol meeting 10 mm (0.39 in).
First to last qualifying date each year at Bristol
YearFirst dateLast date
19161916-02-021916-12-29
19171917-01-141917-12-13
19181918-01-061918-11-30
19491949-01-051949-12-14
19501950-01-111950-12-29

Every Fixed Threshold

Fixed thresholds at Bristol
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days11301917130
35 C (95 F): Days113191713
90 F (32.2 C): Days186191786
0 C (32 F): Ice days (max1119171
0 C (32 F): Frost days (min236191736
-10 C (14 F): Days with min1119171
20 C (68 F): Tropical nights (min266191766
10 mm (0.39 in): Days with 10 mm or more rain547191736
25 mm (0.98 in): Days with 25 mm or more rain513191712
50 mm (1.97 in): Days with 50 mm or more rain5519173
100 mm (3.94 in): Days with 100 mm or more rain1119501

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1917.

Download the Data

  • Data for Bristol 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).