Brule Island Threshold Days by Year (USC00471139)

17 fixed thresholds counted per year at Brule Island (USC00471139): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Brule Island Thresholds

Brule Island: days with 10 mm (0.39 in) or more of precipitation in 66 years, most in 1938 with 36.
Brule Island: days with 25 mm (0.98 in) or more of precipitation in 66 years, most in 1938 with 12.
Brule Island: days with 10 cm (3.9 in) or more of snowfall in 53 years, most in 1950 with 9.
Brule Island: days with a maximum temperature at or above 30 C (86 F) in 52 years, most in 1937 with 40.
17 fixed thresholds have at least one qualifying day at Brule Island.

Days at or above 30 C (86 F)

52 years with a qualifying day

Days per year at Brule Island with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 40 in 1937.

Days at or above 30 C (86 F) per year at Brule Island
Year	Days	Decade average
1937	40	26.7
1938	15	26.7
1939	25	26.7
1940	24	24.1
1941	29	24.1
1942	17	24.1
1943	29	24.1
1944	33	24.1
1945	18	24.1
1946	21	24.1
1947	30	24.1
1948	15	24.1
1949	25	24.1
1950	6	14.1
1951	5	14.1
1952	22	14.1
1953	17	14.1
1954	12	14.1
1955	28	14.1
1956	5	14.1
1957	13	14.1
1958	10	14.1
1959	23	14.1
1960	12	14.2
1961	14	14.2
1962	12	14.2
1963	24	14.2
1964	22	14.2
1965	9	14.2
1966	21	14.2
1967	3	14.2
1968	11	14.2
1969	14	14.2
1970	23	15.2
1971	10	15.2
1972	11	15.2
1973	11	15.2
1974	7	15.2
1975	28	15.2
1976	26	15.2
1977	19	15.2
1978	10	15.2
1979	7	15.2
1980	15	15.2
1981	6	15.2
1982	6	15.2
1983	33	15.2
1984	4	15.2
1985	3	15.2
1986	12	15.2
1987	22	15.2
1988	36	15.2

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

First to last qualifying date each year at Brule Island
Year	First date	Last date
1937	1937-05-30	1937-09-23
1938	1938-06-20	1938-08-18
1939	1939-05-05	1939-09-16
1940	1940-06-01	1940-09-08
1941	1941-05-16	1941-09-21
1942	1942-04-24	1942-09-12
1943	1943-06-03	1943-09-06
1944	1944-05-14	1944-08-15
1945	1945-06-22	1945-09-10
1946	1946-05-29	1946-08-17
1947	1947-06-28	1947-10-15
1948	1948-05-20	1948-09-17
1949	1949-04-12	1949-08-26
1950	1950-06-07	1950-07-16
1951	1951-07-24	1951-08-27
1952	1952-04-27	1952-09-13
1953	1953-05-08	1953-09-03
1954	1954-06-09	1954-08-24
1955	1955-05-02	1955-09-18
1956	1956-06-10	1956-07-26
1957	1957-06-17	1957-08-08
1958	1958-06-29	1958-08-19
1959	1959-05-02	1959-09-07
1960	1960-07-08	1960-09-07
1961	1961-06-28	1961-09-09
1962	1962-04-26	1962-08-28
1963	1963-06-02	1963-08-21
1964	1964-05-21	1964-08-03
1965	1965-05-25	1965-08-14
1966	1966-06-22	1966-09-01
1967	1967-07-20	1967-07-22
1968	1968-06-04	1968-08-23
1969	1969-05-27	1969-08-30
1970	1970-06-07	1970-08-14
1971	1971-06-04	1971-09-03
1972	1972-05-17	1972-08-30
1973	1973-06-10	1973-09-01
1974	1974-07-06	1974-07-26
1975	1975-05-19	1975-08-24
1976	1976-06-06	1976-09-08
1977	1977-05-13	1977-08-27
1978	1978-05-26	1978-09-06
1979	1979-06-15	1979-07-24
1980	1980-05-04	1980-08-07
1981	1981-07-04	1981-07-19
1982	1982-07-06	1982-08-08
1983	1983-06-12	1983-09-10
1984	1984-06-07	1984-08-08
1985	1985-07-14	1985-08-09
1986	1986-05-29	1986-08-17
1987	1987-05-17	1987-08-04
1988	1988-05-30	1988-08-17

Every Fixed Threshold

Fixed thresholds at Brule Island
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	52	40	1937	36
35 C (95 F): Days	23	12	1937	6
90 F (32.2 C): Days	45	31	1937	23
100 F (37.8 C): Days	4	1	1941	1
0 C (32 F): Ice days (max	52	110	1955	86
0 C (32 F): Frost days (min	52	220	1967	208
-10 C (14 F): Days with min	52	115	1950	91
-20 C (-4 F): Days with min	52	61	1963	50
-30 C (-22 F): Days with min	49	20	1972	10
-40 C (-40 F): Days with min	3	1	1965	1
20 C (68 F): Tropical nights (min	14	4	1988	4
10 mm (0.39 in): Days with 10 mm or more rain	66	36	1938	13
25 mm (0.98 in): Days with 25 mm or more rain	66	12	1938	4
50 mm (1.97 in): Days with 50 mm or more rain	33	2	1923	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1942	1
10 cm (3.9 in): Days with 10 cm or more snowfall	53	9	1950	3
25 cm (9.8 in): Days with 25 cm or more snowfall	10	3	1961	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1937.

Download the Data

Data for Brule Island 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).

Brule Island Threshold Days by Year (USC00471139)

Key Facts for Brule Island Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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