Brockville Threshold Days by Year (CA006100969)

18 fixed thresholds counted per year at Brockville (CA006100969): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Brockville Thresholds

Brockville: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 1921 with 46.
Brockville: days with a maximum temperature at or below 0 C (32 F) in 69 years, most in 1875 with 95.
Brockville: days with 10 cm (3.9 in) or more of snowfall in 69 years, most in 1959 with 13.
Brockville: nights with a minimum temperature at or below 0 C (32 F) in 68 years, most in 1875 with 196.
18 fixed thresholds have at least one qualifying day at Brockville.

Days at or above 30 C (86 F)

69 years with a qualifying day

Days per year at Brockville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 46 in 1921.

Days at or above 30 C (86 F) per year at Brockville
Year	Days	Decade average
1873	4	10.8
1874	7	10.8
1875	7	10.8
1876	22	10.8
1877	12	10.8
1878	13	10.8
1886	5	5
1916	30	27
1917	23	27
1918	22	27
1919	33	27
1920	32	18
1921	46	18
1922	24	18
1923	21	18
1924	8	18
1925	21	18
1926	7	18
1927	9	18
1928	9	18
1929	3	18
1930	3	12
1931	18	12
1932	4	12
1933	18	12
1934	18	12
1935	11	12
1936	8	12
1937	2	12
1939	26	12
1940	22	20
1941	28	20
1942	13	20
1943	11	20
1944	25	20
1945	18	20
1946	15	20
1947	20	20
1948	13	20
1949	35	20
1950	6	15.3
1951	3	15.3
1952	26	15.3
1953	23	15.3
1954	5	15.3
1955	37	15.3
1956	4	15.3
1957	16	15.3
1958	9	15.3
1959	24	15.3
1960	13	9.1
1961	13	9.1
1963	12	9.1
1964	11	9.1
1965	4	9.1
1966	13	9.1
1967	1	9.1
1968	7	9.1
1969	8	9.1
1970	9	9.1
1971	4	9.1
1972	3	9.1
1973	16	9.1
1974	5	9.1
1975	14	9.1
1976	1	9.1
1977	12	9.1
1978	14	9.1
1979	13	9.1

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

First to last qualifying date each year at Brockville
Year	First date	Last date
1873	1873-06-10	1873-07-28
1874	1874-07-07	1874-08-12
1875	1875-06-11	1875-09-02
1876	1876-06-12	1876-08-15
1877	1877-07-16	1877-09-15
1878	1878-06-29	1878-08-14
1886	1886-05-18	1886-09-04
1916	1916-07-07	1916-09-07
1917	1917-06-13	1917-08-16
1918	1918-05-18	1918-08-25
1919	1919-06-02	1919-08-07
1920	1920-05-26	1920-09-26
1921	1921-04-27	1921-09-02
1922	1922-05-24	1922-09-10
1923	1923-06-18	1923-08-11
1924	1924-07-06	1924-08-24
1925	1925-06-03	1925-08-30
1926	1926-07-20	1926-08-06
1927	1927-06-21	1927-07-21
1928	1928-06-13	1928-08-17
1929	1929-07-28	1929-09-05
1930	1930-06-05	1930-08-05
1931	1931-05-06	1931-09-13
1932	1932-05-16	1932-09-01
1933	1933-06-11	1933-08-16
1934	1934-05-04	1934-08-10
1935	1935-07-05	1935-08-20
1936	1936-06-10	1936-08-04
1937	1937-07-08	1937-08-06
1939	1939-06-03	1939-09-16
1940	1940-05-22	1940-08-18
1941	1941-06-07	1941-08-10
1942	1942-06-12	1942-09-18
1943	1943-06-22	1943-08-23
1944	1944-06-27	1944-08-31
1945	1945-06-25	1945-09-08
1946	1946-06-25	1946-09-20
1947	1947-06-11	1947-09-11
1948	1948-06-29	1948-09-07
1949	1949-06-12	1949-08-27
1950	1950-06-25	1950-08-17
1951	1951-07-30	1951-09-13
1952	1952-06-14	1952-09-13
1953	1953-06-17	1953-09-05
1954	1954-06-21	1954-08-23
1955	1955-06-03	1955-08-30
1956	1956-06-13	1956-08-07
1957	1957-06-16	1957-08-11
1958	1958-07-02	1958-08-31
1959	1959-06-10	1959-09-28
1960	1960-07-18	1960-09-08
1961	1961-05-15	1961-09-14
1963	1963-06-04	1963-07-28
1964	1964-06-23	1964-08-11
1965	1965-06-28	1965-09-22
1966	1966-06-24	1966-08-09
1967	1967-06-03	1967-06-03
1968	1968-07-14	1968-08-05
1969	1969-06-12	1969-08-16
1970	1970-05-01	1970-08-15
1971	1971-06-20	1971-08-20
1972	1972-07-12	1972-07-21
1973	1973-07-08	1973-09-05
1974	1974-06-10	1974-08-21
1975	1975-05-23	1975-08-15
1976	1976-08-22	1976-08-22
1977	1977-05-21	1977-08-29
1978	1978-05-28	1978-08-19
1979	1979-06-20	1979-07-30

Every Fixed Threshold

Fixed thresholds at Brockville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	69	46	1921	13
35 C (95 F): Days	13	8	1916	1
90 F (32.2 C): Days	51	26	1921	2
100 F (37.8 C): Days	4	2	1917	1
0 C (32 F): Ice days (max	69	95	1875	62
0 C (32 F): Frost days (min	68	196	1875	135
-10 C (14 F): Days with min	68	90	1875	53
-20 C (-4 F): Days with min	68	42	1875	22
-30 C (-22 F): Days with min	40	8	1917	3
20 C (68 F): Tropical nights (min	67	26	1955	6
25 C (77 F): Days with min	5	5	1921	1
10 mm (0.39 in): Days with 10 mm or more rain	68	40	1945	32
25 mm (0.98 in): Days with 25 mm or more rain	66	9	1947	6
50 mm (1.97 in): Days with 50 mm or more rain	21	3	1945	2
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1979	1
10 cm (3.9 in): Days with 10 cm or more snowfall	69	13	1959	4
25 cm (9.8 in): Days with 25 cm or more snowfall	26	5	1876	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1966	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1873.

Download the Data

Data for Brockville 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).

Brockville Threshold Days by Year (CA006100969)

Key Facts for Brockville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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