Bristol Threshold Days by Year (USC00371175)

11 fixed thresholds counted per year at Bristol (USC00371175): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Bristol Thresholds

Bristol: days with a maximum temperature at or below 0 C (32 F) in 24 years, most in 1904 with 54.
Bristol: nights with a minimum temperature at or below 0 C (32 F) in 23 years, most in 1924 with 146.
Bristol: nights with a minimum temperature at or below -10 C (14 F) in 23 years, most in 1924 with 34.
Bristol: nights with a minimum temperature at or above 20 C (68 F) in 22 years, most in 1898 with 33.
11 fixed thresholds have at least one qualifying day at Bristol.

Days at or above 30 C (86 F)

18 years with a qualifying day

Days per year at Bristol with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 6 in 1896.

Days at or above 30 C (86 F) per year at Bristol
Year	Days	Decade average
1896	6	2.8
1897	1	2.8
1898	3	2.8
1899	1	2.8
1900	3	2.3
1901	4	2.3
1903	1	2.3
1905	1	2.3
1910	1	2
1911	4	2
1912	1	2
1913	1	2
1917	2	2
1918	1	2
1919	4	2
1920	1	2.3
1921	5	2.3
1924	1	2.3

For each year, a bar from the first to the last day at Bristol meeting 30 C (86 F).

First to last qualifying date each year at Bristol
Year	First date	Last date
1896	1896-05-10	1896-08-13
1897	1897-09-11	1897-09-11
1898	1898-07-01	1898-09-03
1899	1899-06-06	1899-06-06
1900	1900-06-25	1900-08-27
1901	1901-07-03	1901-08-28
1903	1903-07-09	1903-07-09
1905	1905-07-18	1905-07-18
1910	1910-07-11	1910-07-11
1911	1911-07-11	1911-07-21
1912	1912-08-13	1912-08-13
1913	1913-07-02	1913-07-02
1917	1917-07-30	1917-07-31
1918	1918-07-28	1918-07-28
1919	1919-05-29	1919-07-05
1920	1920-07-13	1920-07-13
1921	1921-06-22	1921-09-03
1924	1924-07-31	1924-07-31

Every Fixed Threshold

Fixed thresholds at Bristol
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	18	6	1896	1
90 F (32.2 C): Days	4	2	1901	1
0 C (32 F): Ice days (max	24	54	1904	49
0 C (32 F): Frost days (min	23	146	1924	146
-10 C (14 F): Days with min	23	34	1924	34
-20 C (-4 F): Days with min	11	2	1896	2
20 C (68 F): Tropical nights (min	22	33	1898	1
10 mm (0.39 in): Days with 10 mm or more rain	20	41	1919	38
25 mm (0.98 in): Days with 25 mm or more rain	20	23	1919	7
50 mm (1.97 in): Days with 50 mm or more rain	20	6	1922	1
100 mm (3.94 in): Days with 100 mm or more rain	6	2	1898	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

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 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Bristol Threshold Days by Year (USC00371175)

Key Facts for Bristol Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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