Grenville Threshold Days by Year (USC00293706)

18 fixed thresholds counted per year at Grenville (USC00293706): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Grenville Thresholds

Grenville: days with 10 mm (0.39 in) or more of precipitation in 74 years, most in 1941 with 25.
Grenville: days with a maximum temperature at or above 30 C (86 F) in 69 years, most in 2000 with 99.
Grenville: days with a maximum temperature at or below 0 C (32 F) in 69 years, most in 1948 with 31.
Grenville: nights with a minimum temperature at or below 0 C (32 F) in 69 years, most in 1970 with 189.
18 fixed thresholds have at least one qualifying day at Grenville.

Days at or above 30 C (86 F)

69 years with a qualifying day

Days per year at Grenville with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 99 in 2000.

Days at or above 30 C (86 F) per year at Grenville
Year	Days	Decade average
1941	21	42
1942	37	42
1943	55	42
1944	46	42
1945	44	42
1946	57	42
1948	34	42
1952	52	47.5
1954	62	47.5
1956	63	47.5
1957	33	47.5
1958	45	47.5
1959	30	47.5
1960	46	37.3
1961	29	37.3
1962	37	37.3
1963	49	37.3
1964	59	37.3
1965	13	37.3
1966	35	37.3
1967	19	37.3
1968	50	37.3
1969	36	37.3
1970	61	49.1
1971	41	49.1
1972	33	49.1
1973	48	49.1
1974	76	49.1
1975	41	49.1
1976	33	49.1
1977	55	49.1
1978	62	49.1
1979	41	49.1
1980	79	49.7
1981	47	49.7
1982	33	49.7
1983	66	49.7
1984	50	49.7
1985	54	49.7
1986	39	49.7
1987	41	49.7
1988	54	49.7
1989	34	49.7
1990	45	49.4
1991	24	49.4
1992	32	49.4
1993	41	49.4
1994	72	49.4
1995	54	49.4
1996	58	49.4
1997	47	49.4
1998	74	49.4
1999	47	49.4
2000	99	61.8
2001	70	61.8
2002	72	61.8
2003	65	61.8
2006	42	61.8
2007	55	61.8
2008	46	61.8
2009	45	61.8
2010	66	56.9
2011	86	56.9
2014	49	56.9
2015	53	56.9
2016	47	56.9
2017	34	56.9
2018	57	56.9
2019	63	56.9

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

First to last qualifying date each year at Grenville
Year	First date	Last date
1941	1941-05-14	1941-09-08
1942	1942-05-28	1942-08-29
1943	1943-04-02	1943-09-19
1944	1944-06-17	1944-09-23
1945	1945-05-19	1945-09-12
1946	1946-06-06	1946-09-26
1948	1948-06-07	1948-09-19
1952	1952-06-08	1952-08-27
1954	1954-06-06	1954-10-04
1956	1956-05-07	1956-09-21
1957	1957-06-16	1957-08-28
1958	1958-05-27	1958-09-10
1959	1959-06-10	1959-09-06
1960	1960-05-22	1960-09-15
1961	1961-05-12	1961-08-25
1962	1962-05-12	1962-10-12
1963	1963-05-09	1963-09-20
1964	1964-05-25	1964-09-09
1965	1965-04-22	1965-08-16
1966	1966-05-22	1966-09-25
1967	1967-05-10	1967-10-01
1968	1968-05-30	1968-10-14
1969	1969-06-07	1969-08-23
1970	1970-05-19	1970-09-12
1971	1971-06-16	1971-09-14
1972	1972-06-19	1972-10-03
1973	1973-06-09	1973-10-08
1974	1974-05-08	1974-09-11
1975	1975-06-03	1975-09-11
1976	1976-06-10	1976-09-05
1977	1977-06-11	1977-10-01
1978	1978-05-14	1978-09-16
1979	1979-06-13	1979-10-07
1980	1980-06-04	1980-09-21
1981	1981-04-26	1981-08-07
1982	1982-06-28	1982-09-26
1983	1983-06-18	1983-09-20
1984	1984-05-10	1984-09-12
1985	1985-06-07	1985-09-09
1986	1986-05-21	1986-08-21
1987	1987-06-12	1987-08-21
1988	1988-05-14	1988-09-07
1989	1989-04-20	1989-09-03
1990	1990-06-04	1990-09-13
1991	1991-06-05	1991-10-17
1992	1992-04-30	1992-10-13
1993	1993-06-12	1993-10-05
1994	1994-05-30	1994-09-29
1995	1995-05-16	1995-09-06
1996	1996-05-03	1996-10-12
1997	1997-06-19	1997-09-25
1998	1998-05-18	1998-09-30
1999	1999-06-19	1999-10-12
2000	2000-05-04	2000-10-03
2001	2001-05-01	2001-09-28
2002	2002-05-11	2002-09-06
2003	2003-05-13	2003-10-23
2006	2006-04-13	2006-08-10
2007	2007-06-12	2007-09-17
2008	2008-05-20	2008-08-23
2009	2009-05-09	2009-08-24
2010	2010-05-30	2010-09-30
2011	2011-05-28	2011-09-26
2014	2014-05-04	2014-09-10
2015	2015-06-03	2015-09-22
2016	2016-06-09	2016-08-19
2017	2017-06-10	2017-09-15
2018	2018-05-08	2018-10-04
2019	2019-06-09	2019-09-08

Every Fixed Threshold

Fixed thresholds at Grenville
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	69	99	2000	63
35 C (95 F): Days	57	21	1974	7
40 C (104 F): Days	1	1	1968	1
90 F (32.2 C): Days	68	65	2000	37
100 F (37.8 C): Days	11	2	1946	1
0 C (32 F): Ice days (max	69	31	1948	13
0 C (32 F): Frost days (min	69	189	1970	163
-10 C (14 F): Days with min	69	51	1979	32
-20 C (-4 F): Days with min	44	8	1963	1
-30 C (-22 F): Days with min	3	2	1963	1
20 C (68 F): Tropical nights (min	13	2	1943	1
10 mm (0.39 in): Days with 10 mm or more rain	74	25	1941	10
25 mm (0.98 in): Days with 25 mm or more rain	68	13	1942	5
50 mm (1.97 in): Days with 50 mm or more rain	30	4	1942	2
100 mm (3.94 in): Days with 100 mm or more rain	2	1	1941	1
10 cm (3.9 in): Days with 10 cm or more snowfall	38	6	1973	3
25 cm (9.8 in): Days with 25 cm or more snowfall	6	3	1946	2
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	1973	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1941.

Download the Data

Data for Grenville 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).

Grenville Threshold Days by Year (USC00293706)

Key Facts for Grenville Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

Related