Toronto Lester B. Pearson Int' Threshold Days by Year (CA006158733)

17 fixed thresholds counted per year at Toronto Lester B. Pearson Int' (CA006158733): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Toronto Lester B. Pearson Int' Thresholds

Toronto Lester B. Pearson Int': days with a maximum temperature at or above 30 C (86 F) in 45 years, most in 1959 with 43.
Toronto Lester B. Pearson Int': days with a maximum temperature at or below 0 C (32 F) in 45 years, most in 1940 with 84.
Toronto Lester B. Pearson Int': nights with a minimum temperature at or below 0 C (32 F) in 45 years, most in 1972 with 173.
Toronto Lester B. Pearson Int': nights with a minimum temperature at or below -10 C (14 F) in 45 years, most in 1963 with 66.
17 fixed thresholds have at least one qualifying day at Toronto Lester B. Pearson Int'.

Days at or above 30 C (86 F)

45 years with a qualifying day

Days per year at Toronto Lester B. Pearson Int' with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 43 in 1959.

Days at or above 30 C (86 F) per year at Toronto Lester B. Pearson Int'
Year	Days	Decade average
1938	36	36
1940	14	21.1
1941	28	21.1
1942	13	21.1
1943	21	21.1
1944	25	21.1
1945	16	21.1
1946	15	21.1
1947	21	21.1
1948	19	21.1
1949	39	21.1
1950	15	22.8
1951	14	22.8
1952	31	22.8
1953	25	22.8
1954	15	22.8
1955	39	22.8
1956	10	22.8
1957	20	22.8
1958	16	22.8
1959	43	22.8
1960	11	16.8
1961	18	16.8
1962	21	16.8
1963	25	16.8
1964	22	16.8
1965	9	16.8
1966	23	16.8
1967	4	16.8
1968	13	16.8
1969	22	16.8
1970	13	13.9
1971	14	13.9
1972	8	13.9
1973	23	13.9
1974	15	13.9
1975	20	13.9
1976	10	13.9
1977	10	13.9
1978	18	13.9
1979	8	13.9
1980	7	13.8
1981	10	13.8
1982	8	13.8
1983	30	13.8

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

First to last qualifying date each year at Toronto Lester B. Pearson Int'
Year	First date	Last date
1938	1938-06-20	1938-08-29
1940	1940-06-04	1940-09-20
1941	1941-05-20	1941-09-22
1942	1942-05-30	1942-09-17
1943	1943-06-04	1943-09-01
1944	1944-05-26	1944-08-21
1945	1945-06-14	1945-09-08
1946	1946-06-24	1946-09-06
1947	1947-06-28	1947-09-10
1948	1948-06-04	1948-09-17
1949	1949-05-04	1949-08-27
1950	1950-06-07	1950-08-27
1951	1951-05-16	1951-10-05
1952	1952-06-06	1952-09-13
1953	1953-05-09	1953-09-04
1954	1954-06-10	1954-09-07
1955	1955-05-04	1955-09-19
1956	1956-05-30	1956-08-16
1957	1957-06-15	1957-08-14
1958	1958-06-30	1958-09-15
1959	1959-05-20	1959-09-23
1960	1960-06-28	1960-09-08
1961	1961-06-12	1961-09-22
1962	1962-05-14	1962-09-13
1963	1963-06-06	1963-08-23
1964	1964-05-22	1964-09-10
1965	1965-05-26	1965-09-22
1966	1966-06-25	1966-09-02
1967	1967-06-14	1967-08-17
1968	1968-06-07	1968-08-24
1969	1969-05-28	1969-09-13
1970	1970-06-09	1970-08-26
1971	1971-05-19	1971-09-08
1972	1972-06-14	1972-07-24
1973	1973-06-11	1973-09-05
1974	1974-06-09	1974-08-23
1975	1975-06-23	1975-08-17
1976	1976-06-08	1976-08-28
1977	1977-05-17	1977-09-01
1978	1978-05-26	1978-09-06
1979	1979-05-09	1979-08-04
1980	1980-06-26	1980-08-27
1981	1981-06-15	1981-07-18
1982	1982-07-06	1982-08-16
1983	1983-06-12	1983-09-10

Every Fixed Threshold

Fixed thresholds at Toronto Lester B. Pearson Int'
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	45	43	1959	30
35 C (95 F): Days	18	10	1955	1
90 F (32.2 C): Days	41	23	1955	10
100 F (37.8 C): Days	1	1	1948	1
0 C (32 F): Ice days (max	45	84	1940	54
0 C (32 F): Frost days (min	45	173	1972	151
-10 C (14 F): Days with min	45	66	1963	41
-20 C (-4 F): Days with min	44	16	1948	2
-30 C (-22 F): Days with min	4	2	1976	1
20 C (68 F): Tropical nights (min	39	18	1955	7
25 C (77 F): Days with min	1	1	1949	1
10 mm (0.39 in): Days with 10 mm or more rain	45	34	1977	31
25 mm (0.98 in): Days with 25 mm or more rain	45	8	1962	4
50 mm (1.97 in): Days with 50 mm or more rain	15	2	1970	1
100 mm (3.94 in): Days with 100 mm or more rain	3	1	1948	1
10 cm (3.9 in): Days with 10 cm or more snowfall	42	7	1951	2
25 cm (9.8 in): Days with 25 cm or more snowfall	9	1	1940	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1938.

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Data for Toronto Lester B. Pearson Int' 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 Lester B. Pearson Int' Threshold Days by Year (CA006158733)

Key Facts for Toronto Lester B. Pearson Int' Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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