Toronto Threshold Days by Year (CA006158350)

17 fixed thresholds counted per year at Toronto (CA006158350): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Toronto Thresholds

Toronto: days with a maximum temperature at or below 0 C (32 F) in 143 years, most in 1856 with 90.
Toronto: nights with a minimum temperature at or below 0 C (32 F) in 143 years, most in 1850 with 175.
Toronto: nights with a minimum temperature at or below -10 C (14 F) in 143 years, most in 1856 with 82.
Toronto: days with a maximum temperature at or above 30 C (86 F) in 142 years, most in 1949 with 35.
17 fixed thresholds have at least one qualifying day at Toronto.

Days at or above 30 C (86 F)

142 years with a qualifying day

Days per year at Toronto with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 35 in 1949.

Days at or above 30 C (86 F) per year at Toronto
Year	Days	Decade average
1841	9	4.8
1842	5	4.8
1843	5	4.8
1844	3	4.8
1845	8	4.8
1846	5	4.8
1847	1	4.8
1848	3	4.8
1849	4	4.8
1850	3	7.4
1851	1	7.4
1852	3	7.4
1853	13	7.4
1854	28	7.4
1855	5	7.4
1856	11	7.4
1857	3	7.4
1858	4	7.4
1859	3	7.4
1860	2	6.5
1861	1	6.5
1862	3	6.5
1863	4	6.5
1864	15	6.5
1865	6	6.5
1866	7	6.5
1867	10	6.5
1868	16	6.5
1869	1	6.5
1870	8	7.4
1871	7	7.4
1872	12	7.4
1873	3	7.4
1874	8	7.4
1875	3	7.4
1876	13	7.4
1877	6	7.4
1878	11	7.4
1879	3	7.4
1880	5	6.3
1881	13	6.3
1882	5	6.3
1884	6	6.3
1885	1	6.3
1886	3	6.3
1887	18	6.3
1888	3	6.3
1889	3	6.3
1890	3	11.1
1891	7	11.1
1892	8	11.1
1893	6	11.1
1894	15	11.1
1895	10	11.1
1896	16	11.1
1897	9	11.1
1898	22	11.1
1899	15	11.1
1900	22	12.3
1901	24	12.3
1902	2	12.3
1903	6	12.3
1904	3	12.3
1905	5	12.3
1906	19	12.3
1907	12	12.3
1908	17	12.3
1909	13	12.3
1910	11	18.9
1911	25	18.9
1912	11	18.9
1913	20	18.9
1914	20	18.9
1915	6	18.9
1916	30	18.9
1917	12	18.9
1918	21	18.9
1919	33	18.9
1920	9	13.2
1921	34	13.2
1922	13	13.2
1923	14	13.2
1924	5	13.2
1925	15	13.2
1926	5	13.2
1927	7	13.2
1928	13	13.2
1929	17	13.2
1930	21	19.6
1931	24	19.6
1932	6	19.6
1933	22	19.6
1934	18	19.6
1935	19	19.6
1936	24	19.6
1937	20	19.6
1938	24	19.6
1939	18	19.6
1940	12	17.7
1941	21	17.7
1942	9	17.7
1943	19	17.7
1944	23	17.7
1945	12	17.7
1946	13	17.7
1947	16	17.7
1948	17	17.7
1949	35	17.7
1950	12	18
1951	11	18
1952	25	18
1953	24	18
1954	12	18
1955	32	18
1956	9	18
1957	15	18
1958	9	18
1959	31	18
1960	7	13.7
1961	13	13.7
1962	10	13.7
1963	17	13.7
1964	20	13.7
1965	6	13.7
1966	22	13.7
1967	5	13.7
1968	16	13.7
1969	21	13.7
1970	23	11.5
1971	12	11.5
1972	8	11.5
1973	18	11.5
1974	8	11.5
1975	14	11.5
1976	10	11.5
1977	10	11.5
1978	10	11.5
1979	2	11.5
1980	6	8
1981	9	8
1982	3	8
1983	14	8

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

First to last qualifying date each year at Toronto
Year	First date	Last date
1841	1841-06-08	1841-07-24
1842	1842-04-22	1842-07-23
1843	1843-07-02	1843-09-22
1844	1844-07-15	1844-08-02
1845	1845-07-12	1845-07-22
1846	1846-07-06	1846-08-06
1847	1847-07-20	1847-07-20
1848	1848-06-16	1848-08-15
1849	1849-07-11	1849-07-14
1850	1850-06-07	1850-07-24
1851	1851-09-10	1851-09-10
1852	1852-06-16	1852-07-22
1853	1853-06-13	1853-09-05
1854	1854-06-26	1854-09-06
1855	1855-06-29	1855-07-19
1856	1856-06-22	1856-07-30
1857	1857-07-12	1857-08-13
1858	1858-06-24	1858-06-27
1859	1859-06-29	1859-07-19
1860	1860-07-19	1860-08-08
1861	1861-06-09	1861-06-09
1862	1862-07-05	1862-08-08
1863	1863-08-02	1863-08-19
1864	1864-06-22	1864-08-11
1865	1865-06-04	1865-09-14
1866	1866-06-25	1866-07-28
1867	1867-06-30	1867-09-18
1868	1868-07-01	1868-07-24
1869	1869-08-20	1869-08-20
1870	1870-06-17	1870-07-23
1871	1871-07-09	1871-08-16
1872	1872-06-29	1872-08-22
1873	1873-06-19	1873-07-23
1874	1874-05-09	1874-09-11
1875	1875-06-23	1875-07-26
1876	1876-06-24	1876-08-14
1877	1877-06-25	1877-07-30
1878	1878-06-30	1878-08-08
1879	1879-07-14	1879-08-01
1880	1880-05-26	1880-08-28
1881	1881-05-12	1881-09-07
1882	1882-07-25	1882-09-18
1884	1884-07-01	1884-08-21
1885	1885-07-17	1885-07-17
1886	1886-07-06	1886-08-11
1887	1887-06-16	1887-08-10
1888	1888-06-15	1888-07-04
1889	1889-07-08	1889-07-10
1890	1890-06-25	1890-08-03
1891	1891-06-15	1891-09-25
1892	1892-06-12	1892-08-18
1893	1893-06-19	1893-08-11
1894	1894-06-11	1894-07-30
1895	1895-05-30	1895-09-21
1896	1896-05-09	1896-08-15
1897	1897-07-04	1897-09-16
1898	1898-06-30	1898-09-04
1899	1899-06-05	1899-08-31
1900	1900-05-14	1900-09-26
1901	1901-06-27	1901-09-07
1902	1902-07-08	1902-07-17
1903	1903-06-30	1903-07-25
1904	1904-07-15	1904-07-19
1905	1905-07-17	1905-08-12
1906	1906-05-18	1906-09-18
1907	1907-06-18	1907-08-17
1908	1908-06-08	1908-09-10
1909	1909-06-20	1909-09-14
1910	1910-06-20	1910-07-24
1911	1911-05-20	1911-09-01
1912	1912-06-29	1912-09-10
1913	1913-05-02	1913-08-18
1914	1914-05-21	1914-09-22
1915	1915-07-14	1915-09-15
1916	1916-07-02	1916-09-07
1917	1917-07-21	1917-08-20
1918	1918-06-01	1918-08-23
1919	1919-05-29	1919-09-09
1920	1920-06-10	1920-09-26
1921	1921-05-20	1921-09-12
1922	1922-06-07	1922-09-10
1923	1923-06-05	1923-08-07
1924	1924-07-22	1924-08-31
1925	1925-06-01	1925-09-20
1926	1926-07-06	1926-08-28
1927	1927-05-22	1927-09-15
1928	1928-07-04	1928-08-28
1929	1929-05-29	1929-09-05
1930	1930-05-07	1930-09-02
1931	1931-06-19	1931-09-22
1932	1932-07-13	1932-09-01
1933	1933-06-08	1933-09-08
1934	1934-05-20	1934-08-19
1935	1935-07-05	1935-08-20
1936	1936-05-08	1936-09-23
1937	1937-07-07	1937-09-03
1938	1938-06-21	1938-08-20
1939	1939-05-06	1939-09-16
1940	1940-06-04	1940-09-20
1941	1941-05-20	1941-08-30
1942	1942-06-30	1942-09-02
1943	1943-06-04	1943-09-01
1944	1944-06-27	1944-08-22
1945	1945-06-24	1945-09-07
1946	1946-06-24	1946-08-08
1947	1947-06-24	1947-09-10
1948	1948-07-05	1948-09-18
1949	1949-05-04	1949-08-27
1950	1950-06-07	1950-08-25
1951	1951-05-15	1951-08-31
1952	1952-06-06	1952-09-13
1953	1953-05-10	1953-09-04
1954	1954-06-14	1954-09-07
1955	1955-05-04	1955-09-19
1956	1956-05-30	1956-08-09
1957	1957-06-15	1957-08-14
1958	1958-06-30	1958-09-15
1959	1959-06-08	1959-09-09
1960	1960-07-12	1960-09-08
1961	1961-06-05	1961-09-11
1962	1962-04-27	1962-08-30
1963	1963-06-09	1963-10-07
1964	1964-05-19	1964-09-08
1965	1965-06-19	1965-09-20
1966	1966-06-23	1966-09-02
1967	1967-06-14	1967-07-24
1968	1968-06-06	1968-08-24
1969	1969-05-28	1969-09-13
1970	1970-05-19	1970-09-22
1971	1971-06-04	1971-09-08
1972	1972-07-12	1972-09-17
1973	1973-06-11	1973-09-04
1974	1974-07-03	1974-08-21
1975	1975-06-18	1975-08-10
1976	1976-06-07	1976-09-12
1977	1977-05-17	1977-08-28
1978	1978-06-18	1978-09-11
1979	1979-06-16	1979-07-22
1980	1980-05-05	1980-08-27
1981	1981-06-15	1981-07-13
1982	1982-07-07	1982-07-18
1983	1983-06-12	1983-09-10

Every Fixed Threshold

Fixed thresholds at Toronto
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	142	35	1949	14
35 C (95 F): Days	44	6	1900	1
40 C (104 F): Days	1	3	1936	3
90 F (32.2 C): Days	118	21	1916	5
100 F (37.8 C): Days	7	4	1936	1
0 C (32 F): Ice days (max	143	90	1856	43
0 C (32 F): Frost days (min	143	175	1850	99
-10 C (14 F): Days with min	143	82	1856	24
-20 C (-4 F): Days with min	119	20	1885	1
-30 C (-22 F): Days with min	5	2	1855	1
20 C (68 F): Tropical nights (min	128	33	1973	32
25 C (77 F): Days with min	7	4	1936	1
10 mm (0.39 in): Days with 10 mm or more rain	136	40	1869	32
25 mm (0.98 in): Days with 25 mm or more rain	135	11	1977	3
50 mm (1.97 in): Days with 50 mm or more rain	46	3	1850	3
10 cm (3.9 in): Days with 10 cm or more snowfall	134	14	1876	1
25 cm (9.8 in): Days with 25 cm or more snowfall	31	3	1870	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1841.

Download the Data

Data for Toronto 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).

Toronto Threshold Days by Year (CA006158350)

Key Facts for Toronto Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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