Colebrook Threshold Days by Year (USC00361652)

15 fixed thresholds counted per year at Colebrook (USC00361652): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Colebrook Thresholds

Colebrook: days with 10 mm (0.39 in) or more of precipitation in 32 years, most in 1915 with 49.
Colebrook: days with 25 mm (0.98 in) or more of precipitation in 32 years, most in 1915 with 17.
Colebrook: days with 50 mm (1.97 in) or more of precipitation in 27 years, most in 1927 with 4.
Colebrook: days with a maximum temperature at or above 30 C (86 F) in 26 years, most in 1921 with 54.
15 fixed thresholds have at least one qualifying day at Colebrook.

Days at or above 30 C (86 F)

26 years with a qualifying day

Days per year at Colebrook with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 54 in 1921.

Days at or above 30 C (86 F) per year at Colebrook
Year	Days	Decade average
1917	17	27.7
1918	35	27.7
1919	31	27.7
1920	24	29.9
1921	54	29.9
1922	30	29.9
1923	37	29.9
1924	19	29.9
1925	33	29.9
1926	21	29.9
1927	18	29.9
1928	25	29.9
1929	38	29.9
1930	50	28.9
1931	35	28.9
1932	34	28.9
1933	27	28.9
1934	23	28.9
1935	24	28.9
1936	31	28.9
1937	21	28.9
1938	16	28.9
1939	28	28.9
1940	17	22.3
1941	36	22.3
1942	14	22.3

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

First to last qualifying date each year at Colebrook
Year	First date	Last date
1917	1917-06-24	1917-08-29
1918	1918-05-06	1918-08-27
1919	1919-05-05	1919-10-03
1920	1920-06-01	1920-09-26
1921	1921-04-25	1921-09-08
1922	1922-05-11	1922-10-06
1923	1923-05-29	1923-09-04
1924	1924-05-06	1924-09-01
1925	1925-06-01	1925-09-13
1926	1926-05-02	1926-09-25
1927	1927-06-10	1927-10-02
1928	1928-05-04	1928-08-30
1929	1929-04-05	1929-09-09
1930	1930-05-05	1930-09-26
1931	1931-05-29	1931-09-22
1932	1932-05-16	1932-09-02
1933	1933-05-20	1933-08-13
1934	1934-05-06	1934-08-10
1935	1935-04-27	1935-08-17
1936	1936-05-08	1936-09-12
1937	1937-05-22	1937-09-04
1938	1938-04-28	1938-08-17
1939	1939-05-06	1939-10-10
1940	1940-05-14	1940-09-21
1941	1941-04-14	1941-10-07
1942	1942-04-30	1942-09-17

Every Fixed Threshold

Fixed thresholds at Colebrook
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	26	54	1921	14
35 C (95 F): Days	17	12	1930	2
90 F (32.2 C): Days	26	30	1921	2
100 F (37.8 C): Days	3	2	1918	2
0 C (32 F): Ice days (max	26	39	1918	24
0 C (32 F): Frost days (min	26	148	1926	127
-10 C (14 F): Days with min	26	41	1934	18
-20 C (-4 F): Days with min	10	7	1918	4
20 C (68 F): Tropical nights (min	26	19	1941	10
10 mm (0.39 in): Days with 10 mm or more rain	32	49	1915	42
25 mm (0.98 in): Days with 25 mm or more rain	32	17	1915	16
50 mm (1.97 in): Days with 50 mm or more rain	27	4	1927	4
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1925	1
10 cm (3.9 in): Days with 10 cm or more snowfall	13	4	1925	1
25 cm (9.8 in): Days with 25 cm or more snowfall	2	1	1925	1

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 Colebrook 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).

Colebrook Threshold Days by Year (USC00361652)

Key Facts for Colebrook Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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