Cornwall Threshold Days by Year (USC00431580)

19 fixed thresholds counted per year at Cornwall (USC00431580): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Cornwall Thresholds

Cornwall: days with a maximum temperature at or above 30 C (86 F) in 113 years, most in 1949 with 53.
Cornwall: days with a maximum temperature at or below 0 C (32 F) in 113 years, most in 1904 with 89.
Cornwall: nights with a minimum temperature at or below 0 C (32 F) in 113 years, most in 2002 with 182.
Cornwall: nights with a minimum temperature at or below -10 C (14 F) in 113 years, most in 1904 with 87.
19 fixed thresholds have at least one qualifying day at Cornwall.

Days at or above 30 C (86 F)

113 years with a qualifying day

Days per year at Cornwall with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 53 in 1949.

Days at or above 30 C (86 F) per year at Cornwall
Year	Days	Decade average
1894	16	17
1895	19	17
1896	18	17
1897	9	17
1898	15	17
1899	25	17
1900	24	12.8
1902	6	12.8
1903	9	12.8
1904	8	12.8
1909	17	12.8
1910	7	17.3
1911	34	17.3
1914	16	17.3
1915	7	17.3
1916	19	17.3
1917	12	17.3
1918	24	17.3
1919	19	17.3
1920	17	13.4
1921	30	13.4
1922	8	13.4
1923	15	13.4
1924	8	13.4
1926	7	13.4
1927	4	13.4
1928	18	13.4
1930	24	29.4
1931	18	29.4
1933	25	29.4
1934	34	29.4
1935	18	29.4
1936	28	29.4
1937	43	29.4
1938	33	29.4
1939	42	29.4
1941	31	32
1942	27	32
1944	44	32
1945	29	32
1946	19	32
1947	33	32
1948	20	32
1949	53	32
1951	13	25.7
1952	32	25.7
1953	34	25.7
1954	7	25.7
1955	43	25.7
1956	13	25.7
1957	22	25.7
1958	17	25.7
1959	50	25.7
1960	17	19.4
1961	24	19.4
1962	15	19.4
1963	28	19.4
1964	24	19.4
1965	28	19.4
1966	15	19.4
1967	13	19.4
1968	13	19.4
1969	17	19.4
1970	26	22.8
1971	18	22.8
1972	11	22.8
1973	31	22.8
1974	15	22.8
1975	40	22.8
1976	16	22.8
1977	22	22.8
1978	22	22.8
1979	27	22.8
1980	20	14.7
1981	9	14.7
1982	12	14.7
1983	30	14.7
1984	13	14.7
1985	8	14.7
1986	2	14.7
1987	16	14.7
1988	27	14.7
1989	10	14.7
1990	5	8.3
1991	19	8.3
1992	1	8.3
2000	7	17.3
2001	30	17.3
2002	31	17.3
2003	14	17.3
2004	4	17.3
2005	31	17.3
2006	13	17.3
2007	23	17.3
2008	9	17.3
2009	11	17.3
2010	26	22.9
2011	18	22.9
2012	25	22.9
2013	23	22.9
2014	14	22.9
2015	26	22.9
2016	33	22.9
2017	18	22.9
2018	29	22.9
2019	17	22.9
2020	34	29.4
2021	22	29.4
2022	30	29.4
2023	17	29.4
2024	33	29.4
2025	46	29.4
2026	24	29.4

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

First to last qualifying date each year at Cornwall
Year	First date	Last date
1894	1894-06-11	1894-08-25
1895	1895-05-08	1895-09-23
1896	1896-05-09	1896-09-11
1897	1897-07-03	1897-09-10
1898	1898-07-01	1898-08-31
1899	1899-06-05	1899-08-31
1900	1900-05-14	1900-09-02
1902	1902-05-23	1902-09-01
1903	1903-05-18	1903-09-15
1904	1904-06-05	1904-08-06
1909	1909-06-21	1909-09-15
1910	1910-06-20	1910-07-25
1911	1911-05-12	1911-08-14
1914	1914-05-27	1914-09-23
1915	1915-06-29	1915-09-16
1916	1916-07-07	1916-08-22
1917	1917-07-22	1917-08-13
1918	1918-05-17	1918-08-26
1919	1919-06-02	1919-07-28
1920	1920-06-01	1920-09-26
1921	1921-05-21	1921-09-07
1922	1922-06-07	1922-08-18
1923	1923-04-21	1923-09-01
1924	1924-06-24	1924-08-31
1926	1926-07-10	1926-07-28
1927	1927-06-10	1927-07-14
1928	1928-07-02	1928-10-12
1930	1930-05-06	1930-09-26
1931	1931-06-20	1931-09-14
1933	1933-06-03	1933-08-27
1934	1934-05-05	1934-09-26
1935	1935-07-05	1935-08-20
1936	1936-05-08	1936-09-08
1937	1937-05-30	1937-09-25
1938	1938-04-28	1938-08-21
1939	1939-06-09	1939-09-17
1941	1941-04-20	1941-09-22
1942	1942-05-14	1942-09-18
1944	1944-05-04	1944-09-02
1945	1945-04-13	1945-09-10
1946	1946-06-12	1946-09-20
1947	1947-06-11	1947-09-15
1948	1948-06-28	1948-09-14
1949	1949-06-11	1949-10-12
1951	1951-05-16	1951-08-30
1952	1952-06-15	1952-09-13
1953	1953-05-10	1953-09-05
1954	1954-06-21	1954-08-25
1955	1955-06-17	1955-08-22
1956	1956-06-12	1956-09-05
1957	1957-05-09	1957-09-22
1958	1958-06-30	1958-09-15
1959	1959-05-07	1959-09-10
1960	1960-06-17	1960-09-08
1961	1961-06-13	1961-09-24
1962	1962-04-27	1962-08-31
1963	1963-06-24	1963-10-07
1964	1964-05-23	1964-08-30
1965	1965-05-26	1965-09-23
1966	1966-06-24	1966-08-11
1967	1967-06-03	1967-07-21
1968	1968-06-06	1968-08-25
1969	1969-06-02	1969-09-01
1970	1970-06-02	1970-09-22
1971	1971-05-19	1971-09-05
1972	1972-06-22	1972-07-24
1973	1973-06-06	1973-09-05
1974	1974-06-10	1974-08-21
1975	1975-05-20	1975-08-26
1976	1976-04-17	1976-08-23
1977	1977-05-17	1977-08-30
1978	1978-05-26	1978-08-23
1979	1979-05-08	1979-08-31
1980	1980-05-23	1980-08-26
1981	1981-06-16	1981-08-11
1982	1982-07-08	1982-09-13
1983	1983-06-13	1983-09-20
1984	1984-06-08	1984-08-14
1985	1985-06-23	1985-09-22
1986	1986-07-07	1986-07-08
1987	1987-05-30	1987-08-18
1988	1988-06-13	1988-08-15
1989	1989-05-19	1989-09-11
1990	1990-04-27	1990-07-19
1991	1991-06-18	1991-08-31
1992	1992-05-23	1992-05-23
2000	2000-05-08	2000-09-02
2001	2001-05-03	2001-09-10
2002	2002-04-18	2002-09-15
2003	2003-06-24	2003-08-23
2004	2004-06-09	2004-08-29
2005	2005-06-05	2005-09-15
2006	2006-06-19	2006-08-03
2007	2007-05-11	2007-09-27
2008	2008-06-08	2008-09-06
2009	2009-04-26	2009-08-21
2010	2010-05-26	2010-09-04
2011	2011-05-28	2011-08-07
2012	2012-04-17	2012-08-27
2013	2013-05-31	2013-09-12
2014	2014-06-04	2014-09-06
2015	2015-05-09	2015-09-10
2016	2016-05-27	2016-09-10
2017	2017-05-18	2017-09-28
2018	2018-05-03	2018-09-17
2019	2019-06-28	2019-08-07
2020	2020-05-27	2020-08-24
2021	2021-05-21	2021-08-27
2022	2022-05-13	2022-08-31
2023	2023-04-14	2023-10-05
2024	2024-05-21	2024-09-17
2025	2025-06-04	2025-09-19
2026	2026-05-19	2026-08-10

Every Fixed Threshold

Fixed thresholds at Cornwall
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	113	53	1949	24
35 C (95 F): Days	52	9	1949	1
40 C (104 F): Days	1	1	1916	1
90 F (32.2 C): Days	103	28	1949	13
100 F (37.8 C): Days	7	4	1911	1
0 C (32 F): Ice days (max	113	89	1904	48
0 C (32 F): Frost days (min	113	182	2002	103
-10 C (14 F): Days with min	113	87	1904	49
-20 C (-4 F): Days with min	111	36	2003	20
-30 C (-22 F): Days with min	34	6	1979	2
20 C (68 F): Tropical nights (min	108	20	1988	8
25 C (77 F): Days with min	5	1	1897	1
10 mm (0.39 in): Days with 10 mm or more rain	110	43	2023	21
25 mm (0.98 in): Days with 25 mm or more rain	109	13	1938	4
50 mm (1.97 in): Days with 50 mm or more rain	49	3	2012	1
100 mm (3.94 in): Days with 100 mm or more rain	1	1	1986	1
10 cm (3.9 in): Days with 10 cm or more snowfall	80	15	1956	3
25 cm (9.8 in): Days with 25 cm or more snowfall	25	2	1969	1
50 cm (19.7 in): Days with 50 cm or more snowfall	1	1	2007	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1894.

Download the Data

Data for Cornwall 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).

Cornwall Threshold Days by Year (USC00431580)

Key Facts for Cornwall Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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