Grenora Threshold Days by Year

20 fixed thresholds counted per year at Grenora (USC00323736): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grenora Thresholds

Grenora: nights with a minimum temperature at or below 0 C (32 F) in 71 years, most in 1917 with 231.
Grenora: nights with a minimum temperature at or below -10 C (14 F) in 71 years, most in 1917 with 125.
Grenora: nights with a minimum temperature at or below -20 C (-4 F) in 71 years, most in 1936 with 79.
Grenora: days with a maximum temperature at or above 30 C (86 F) in 70 years, most in 1988 with 62.
20 fixed thresholds have at least one qualifying day at Grenora.

Days at or above 30 C (86 F)

70 years with a qualifying day

Days per year at Grenora with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 62 in 1988.

Days at or above 30 C (86 F) per year at Grenora
Year	Days	Decade average
1907	11	20.7
1908	21	20.7
1909	30	20.7
1910	36	23
1911	17	23
1912	7	23
1913	22	23
1914	26	23
1915	14	23
1916	17	23
1917	41	23
1918	27	23
1920	40	28.8
1921	23	28.8
1922	47	28.8
1923	17	28.8
1925	26	28.8
1927	12	28.8
1928	29	28.8
1929	36	28.8
1930	34	41.4
1931	47	41.4
1932	20	41.4
1933	42	41.4
1934	41	41.4
1935	33	41.4
1936	53	41.4
1937	53	41.4
1939	50	41.4
1940	40	39
1941	30	39
1945	32	39
1946	36	39
1947	36	39
1948	48	39
1949	51	39
1950	23	28.5
1952	26	28.5
1953	16	28.5
1954	22	28.5
1955	38	28.5
1956	32	28.5
1957	31	28.5
1959	40	28.5
1960	41	35.7
1961	60	35.7
1962	17	35.7
1963	33	35.7
1964	34	35.7
1965	20	35.7
1966	42	35.7
1967	43	35.7
1968	27	35.7
1969	40	35.7
1970	51	32.8
1971	38	32.8
1972	27	32.8
1973	39	32.8
1974	31	32.8
1975	26	32.8
1976	32	32.8
1977	27	32.8
1978	23	32.8
1979	34	32.8
1980	38	42.2
1985	27	42.2
1986	30	42.2
1987	43	42.2
1988	62	42.2
1989	53	42.2

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

First to last qualifying date each year at Grenora
Year	First date	Last date
1907	1907-07-03	1907-08-22
1908	1908-04-20	1908-09-16
1909	1909-06-18	1909-09-26
1910	1910-04-20	1910-10-10
1911	1911-05-05	1911-08-31
1912	1912-06-22	1912-07-13
1913	1913-04-15	1913-09-13
1914	1914-06-01	1914-09-18
1915	1915-04-14	1915-09-06
1916	1916-07-06	1916-08-23
1917	1917-05-15	1917-09-24
1918	1918-05-04	1918-08-08
1920	1920-05-21	1920-10-06
1921	1921-06-17	1921-08-31
1922	1922-06-04	1922-09-21
1923	1923-05-26	1923-09-07
1925	1925-05-19	1925-09-03
1927	1927-07-17	1927-09-08
1928	1928-05-07	1928-09-19
1929	1929-06-15	1929-09-01
1930	1930-05-03	1930-08-25
1931	1931-05-14	1931-09-07
1932	1932-05-13	1932-09-08
1933	1933-05-31	1933-09-04
1934	1934-05-05	1934-09-13
1935	1935-06-08	1935-09-22
1936	1936-05-26	1936-09-22
1937	1937-05-28	1937-09-19
1939	1939-04-30	1939-09-22
1940	1940-05-11	1940-09-17
1941	1941-06-18	1941-09-18
1945	1945-06-21	1945-09-06
1946	1946-06-13	1946-09-16
1947	1947-07-02	1947-09-04
1948	1948-05-18	1948-09-16
1949	1949-04-28	1949-09-01
1950	1950-06-14	1950-09-22
1952	1952-04-29	1952-09-26
1953	1953-06-12	1953-10-01
1954	1954-06-23	1954-08-31
1955	1955-06-15	1955-10-11
1956	1956-05-21	1956-09-09
1957	1957-05-30	1957-10-03
1959	1959-06-02	1959-08-28
1960	1960-05-12	1960-09-15
1961	1961-05-28	1961-09-01
1962	1962-04-24	1962-08-26
1963	1963-05-30	1963-10-03
1964	1964-05-17	1964-09-17
1965	1965-07-03	1965-08-23
1966	1966-05-26	1966-09-12
1967	1967-06-18	1967-09-29
1968	1968-04-30	1968-09-14
1969	1969-05-26	1969-09-14
1970	1970-05-17	1970-09-05
1971	1971-06-13	1971-09-12
1972	1972-05-16	1972-09-09
1973	1973-05-31	1973-09-29
1974	1974-06-13	1974-08-07
1975	1975-06-24	1975-09-16
1976	1976-06-02	1976-09-18
1977	1977-05-08	1977-08-25
1978	1978-05-22	1978-09-10
1979	1979-05-16	1979-09-17
1980	1980-04-20	1980-09-08
1985	1985-05-03	1985-08-30
1986	1986-05-28	1986-08-30
1987	1987-04-28	1987-09-22
1988	1988-05-24	1988-09-07
1989	1989-04-22	1989-09-30

Every Fixed Threshold

Fixed thresholds at Grenora
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	70	62	1988	53
35 C (95 F): Days	66	27	1988	18
40 C (104 F): Days	9	5	1988	2
45 C (113 F): Days	1	1	1936	1
90 F (32.2 C): Days	69	46	1988	36
100 F (37.8 C): Days	45	13	1988	6
110 F (43.3 C): Days	2	1	1936	1
0 C (32 F): Ice days (max	70	114	1915	85
0 C (32 F): Frost days (min	71	231	1917	191
-10 C (14 F): Days with min	71	125	1917	99
-20 C (-4 F): Days with min	71	79	1936	45
-30 C (-22 F): Days with min	69	37	1916	20
-40 C (-40 F): Days with min	13	6	1936	1
20 C (68 F): Tropical nights (min	33	11	1947	5
25 C (77 F): Days with min	2	1	1931	1
10 mm (0.39 in): Days with 10 mm or more rain	57	18	1918	5
25 mm (0.98 in): Days with 25 mm or more rain	51	9	1953	2
50 mm (1.97 in): Days with 50 mm or more rain	11	2	1921	1
10 cm (3.9 in): Days with 10 cm or more snowfall	21	6	1975	2
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 1907.

Download the Data

Data for Grenora 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 2026-10-16 (16 October 2026). Threshold counts are computed by this site.

Data as of 2025-12-31. Last revised 31 December 2025 (2025-12-31).

Grenora Threshold Days by Year

Key Facts for Grenora Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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