Brooks Ahrc Threshold Days by Year (CA003030856)

17 fixed thresholds counted per year at Brooks Ahrc (CA003030856): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Brooks Ahrc Thresholds

Brooks Ahrc: days with a maximum temperature at or above 30 C (86 F) in 49 years, most in 1920 with 50.
Brooks Ahrc: days with a maximum temperature at or above 90 F (32.2 C) in 49 years, most in 1920 with 34.
Brooks Ahrc: days with a maximum temperature at or below 0 C (32 F) in 49 years, most in 1955 with 113.
Brooks Ahrc: nights with a minimum temperature at or below 0 C (32 F) in 49 years, most in 1970 with 214.
17 fixed thresholds have at least one qualifying day at Brooks Ahrc.

Days at or above 30 C (86 F)

49 years with a qualifying day

Days per year at Brooks Ahrc with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 50 in 1920.

Days at or above 30 C (86 F) per year at Brooks Ahrc
Year	Days	Decade average
1916	14	27.7
1917	26	27.7
1918	43	27.7
1920	50	22.8
1922	18	22.8
1923	23	22.8
1924	14	22.8
1925	21	22.8
1926	22	22.8
1927	6	22.8
1928	19	22.8
1929	32	22.8
1930	37	30
1931	37	30
1932	25	30
1933	23	30
1934	25	30
1935	21	30
1936	42	30
1954	10	16
1955	20	16
1956	16	16
1957	13	16
1958	23	16
1959	14	16
1960	22	17.9
1961	33	17.9
1962	10	17.9
1963	12	17.9
1964	9	17.9
1965	16	17.9
1966	16	17.9
1967	29	17.9
1968	10	17.9
1969	22	17.9
1970	29	16.7
1971	29	16.7
1972	18	16.7
1973	15	16.7
1974	16	16.7
1975	9	16.7
1976	9	16.7
1977	11	16.7
1978	17	16.7
1979	14	16.7
1980	7	13.8
1981	23	13.8
1982	9	13.8
1983	16	13.8

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

First to last qualifying date each year at Brooks Ahrc
Year	First date	Last date
1916	1916-07-09	1916-08-28
1917	1917-05-15	1917-09-21
1918	1918-06-07	1918-09-11
1920	1920-06-15	1920-10-12
1922	1922-05-25	1922-09-26
1923	1923-06-10	1923-09-14
1924	1924-05-15	1924-09-04
1925	1925-05-18	1925-09-01
1926	1926-06-25	1926-08-29
1927	1927-07-22	1927-08-10
1928	1928-05-20	1928-09-03
1929	1929-06-25	1929-08-31
1930	1930-06-07	1930-09-05
1931	1931-05-12	1931-09-06
1932	1932-06-13	1932-09-07
1933	1933-06-13	1933-08-18
1934	1934-05-14	1934-10-11
1935	1935-06-22	1935-09-14
1936	1936-04-18	1936-10-07
1954	1954-06-22	1954-07-26
1955	1955-07-13	1955-09-02
1956	1956-05-20	1956-08-23
1957	1957-06-04	1957-10-01
1958	1958-05-28	1958-09-11
1959	1959-06-12	1959-09-13
1960	1960-07-06	1960-09-03
1961	1961-06-03	1961-08-24
1962	1962-06-24	1962-08-20
1963	1963-06-19	1963-09-08
1964	1964-07-02	1964-08-18
1965	1965-06-10	1965-08-20
1966	1966-05-26	1966-09-18
1967	1967-07-03	1967-09-29
1968	1968-06-19	1968-09-11
1969	1969-05-24	1969-09-12
1970	1970-05-16	1970-08-31
1971	1971-06-22	1971-08-29
1972	1972-05-31	1972-08-28
1973	1973-06-22	1973-08-14
1974	1974-06-16	1974-09-25
1975	1975-07-03	1975-07-27
1976	1976-07-16	1976-09-05
1977	1977-04-25	1977-07-28
1978	1978-06-05	1978-09-04
1979	1979-06-12	1979-09-15
1980	1980-05-21	1980-10-06
1981	1981-07-03	1981-09-18
1982	1982-06-21	1982-09-08
1983	1983-05-25	1983-09-01

Every Fixed Threshold

Fixed thresholds at Brooks Ahrc
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	49	50	1920	16
35 C (95 F): Days	29	15	1920	1
40 C (104 F): Days	1	1	1918	1
90 F (32.2 C): Days	49	34	1920	12
100 F (37.8 C): Days	7	3	1918	1
0 C (32 F): Ice days (max	49	113	1955	89
0 C (32 F): Frost days (min	49	214	1970	203
-10 C (14 F): Days with min	49	123	1955	78
-20 C (-4 F): Days with min	49	67	1916	33
-30 C (-22 F): Days with min	48	34	1916	11
-40 C (-40 F): Days with min	18	6	1916	3
20 C (68 F): Tropical nights (min	6	4	1918	1
10 mm (0.39 in): Days with 10 mm or more rain	43	16	1966	7
25 mm (0.98 in): Days with 25 mm or more rain	29	4	1963	1
50 mm (1.97 in): Days with 50 mm or more rain	2	1	1963	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	6	1967	1
25 cm (9.8 in): Days with 25 cm or more snowfall	1	1	1967	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1916.

Download the Data

Data for Brooks Ahrc 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 2026-10-17. Last revised 17 October 2026 (2026-10-17).

Brooks Ahrc Threshold Days by Year (CA003030856)

Key Facts for Brooks Ahrc Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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