Mt Vernon Threshold Days by Year (USC00126001)

17 fixed thresholds counted per year at Mt Vernon (USC00126001): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mt Vernon Thresholds

Mt Vernon: days with 10 mm (0.39 in) or more of precipitation in 120 years, most in 1907 with 55.
Mt Vernon: days with 25 mm (0.98 in) or more of precipitation in 120 years, most in 1979 with 22.
Mt Vernon: days with a maximum temperature at or above 30 C (86 F) in 114 years, most in 1906 with 116.
Mt Vernon: days with a maximum temperature at or above 90 F (32.2 C) in 114 years, most in 1901 with 86.
17 fixed thresholds have at least one qualifying day at Mt Vernon.

Days at or above 30 C (86 F)

114 years with a qualifying day

Days per year at Mt Vernon with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 116 in 1906.

Days at or above 30 C (86 F) per year at Mt Vernon
Year	Days	Decade average
1896	109	96
1897	99	96
1898	80	96
1901	109	91.6
1902	101	91.6
1903	86	91.6
1904	62	91.6
1905	92	91.6
1906	116	91.6
1907	75	91.6
1908	112	91.6
1909	71	91.6
1910	65	77.3
1911	93	77.3
1912	59	77.3
1913	97	77.3
1914	96	77.3
1915	70	77.3
1918	62	77.3
1919	76	77.3
1920	53	76.2
1921	109	76.2
1922	97	76.2
1923	72	76.2
1924	52	76.2
1925	104	76.2
1926	87	76.2
1927	57	76.2
1928	66	76.2
1929	65	76.2
1930	75	71.4
1931	86	71.4
1932	66	71.4
1933	68	71.4
1934	78	71.4
1935	55	71.4
1936	93	71.4
1937	71	71.4
1938	63	71.4
1939	59	71.4
1940	48	59.9
1941	77	59.9
1942	65	59.9
1943	72	59.9
1944	79	59.9
1945	27	59.9
1946	42	59.9
1949	69	59.9
1950	27	76.6
1951	61	76.6
1952	86	76.6
1953	111	76.6
1955	94	76.6
1956	84	76.6
1957	72	76.6
1958	67	76.6
1959	87	76.6
1960	81	81.2
1961	76	81.2
1962	90	81.2
1963	104	81.2
1964	92	81.2
1965	82	81.2
1966	74	81.2
1967	59	81.2
1968	74	81.2
1969	80	81.2
1970	75	71.9
1971	71	71.9
1972	74	71.9
1973	78	71.9
1974	53	71.9
1975	77	71.9
1976	59	71.9
1977	88	71.9
1978	82	71.9
1979	62	71.9
1980	92	75.8
1981	64	75.8
1982	55	75.8
1983	93	75.8
1984	80	75.8
1985	65	75.8
1986	84	75.8
1987	92	75.8
1988	79	75.8
1989	54	75.8
1990	58	63.5
1991	81	63.5
1992	33	63.5
1993	73	63.5
1994	70	63.5
1995	76	63.5
1996	51	63.5
1997	48	63.5
1998	78	63.5
1999	67	63.5
2005	86	78.8
2006	72	78.8
2007	106	78.8
2009	51	78.8
2011	80	71.4
2012	80	71.4
2013	51	71.4
2014	46	71.4
2015	58	71.4
2016	90	71.4
2017	63	71.4
2018	93	71.4
2019	82	71.4
2020	56	60.3
2021	58	60.3
2024	77	60.3
2026	50	60.3

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

First to last qualifying date each year at Mt Vernon
Year	First date	Last date
1896	1896-04-12	1896-10-29
1897	1897-05-08	1897-10-17
1898	1898-05-19	1898-10-06
1901	1901-04-29	1901-09-30
1902	1902-04-20	1902-09-19
1903	1903-04-30	1903-09-30
1904	1904-05-25	1904-09-29
1905	1905-04-02	1905-10-08
1906	1906-04-26	1906-10-23
1907	1907-03-24	1907-10-03
1908	1908-04-23	1908-10-21
1909	1909-05-29	1909-10-03
1910	1910-03-24	1910-10-02
1911	1911-03-11	1911-10-06
1912	1912-04-15	1912-10-06
1913	1913-05-01	1913-09-11
1914	1914-05-11	1914-10-08
1915	1915-04-19	1915-09-26
1918	1918-05-22	1918-08-25
1919	1919-05-29	1919-10-11
1920	1920-06-09	1920-09-26
1921	1921-04-25	1921-09-29
1922	1922-05-10	1922-10-05
1923	1923-06-03	1923-09-29
1924	1924-05-05	1924-09-21
1925	1925-04-18	1925-10-01
1926	1926-05-01	1926-10-03
1927	1927-05-21	1927-10-06
1928	1928-05-10	1928-10-13
1929	1929-03-24	1929-09-05
1930	1930-04-11	1930-09-22
1931	1931-05-17	1931-10-05
1932	1932-06-05	1932-09-18
1933	1933-06-04	1933-09-24
1934	1934-04-04	1934-09-25
1935	1935-06-27	1935-09-24
1936	1936-05-17	1936-09-21
1937	1937-04-17	1937-10-01
1938	1938-05-19	1938-10-05
1939	1939-05-24	1939-10-09
1940	1940-06-05	1940-09-23
1941	1941-05-20	1941-10-06
1942	1942-05-28	1942-09-17
1943	1943-05-05	1943-09-02
1944	1944-05-15	1944-09-20
1945	1945-05-31	1945-09-23
1946	1946-06-08	1946-09-08
1949	1949-05-05	1949-09-08
1950	1950-05-18	1950-10-19
1951	1951-05-02	1951-10-06
1952	1952-05-03	1952-10-02
1953	1953-05-26	1953-10-23
1955	1955-04-17	1955-09-30
1956	1956-05-13	1956-10-03
1957	1957-04-20	1957-09-26
1958	1958-05-16	1958-09-27
1959	1959-05-01	1959-10-07
1960	1960-04-24	1960-10-03
1961	1961-06-01	1961-10-13
1962	1962-04-28	1962-10-13
1963	1963-04-22	1963-10-28
1964	1964-05-17	1964-09-21
1965	1965-04-23	1965-09-21
1966	1966-05-09	1966-09-13
1967	1967-04-17	1967-10-05
1968	1968-05-02	1968-10-01
1969	1969-05-06	1969-10-05
1970	1970-05-01	1970-09-26
1971	1971-04-21	1971-10-04
1972	1972-05-22	1972-09-29
1973	1973-06-04	1973-10-12
1974	1974-05-19	1974-09-13
1975	1975-05-19	1975-10-14
1976	1976-04-21	1976-09-20
1977	1977-04-16	1977-09-19
1978	1978-05-24	1978-09-21
1979	1979-05-09	1979-10-22
1980	1980-04-23	1980-10-11
1981	1981-04-27	1981-10-06
1982	1982-05-13	1982-10-07
1983	1983-06-11	1983-10-04
1984	1984-05-26	1984-10-15
1985	1985-04-22	1985-09-23
1986	1986-04-26	1986-10-05
1987	1987-04-22	1987-09-29
1988	1988-04-06	1988-09-23
1989	1989-04-26	1989-10-14
1990	1990-04-25	1990-09-29
1991	1991-05-16	1991-09-17
1992	1992-05-17	1992-09-18
1993	1993-05-09	1993-09-15
1994	1994-05-24	1994-10-02
1995	1995-04-10	1995-09-15
1996	1996-05-19	1996-09-09
1997	1997-05-19	1997-09-20
1998	1998-05-14	1998-10-06
1999	1999-06-06	1999-09-29
2005	2005-05-12	2005-10-21
2006	2006-05-25	2006-10-05
2007	2007-05-01	2007-10-09
2009	2009-05-23	2009-09-22
2011	2011-04-10	2011-09-13
2012	2012-04-02	2012-09-08
2013	2013-05-20	2013-09-13
2014	2014-05-07	2014-10-03
2015	2015-05-09	2015-09-26
2016	2016-05-30	2016-10-19
2017	2017-05-20	2017-10-05
2018	2018-05-11	2018-10-09
2019	2019-05-18	2019-10-04
2020	2020-05-26	2020-09-11
2021	2021-05-23	2021-09-29
2024	2024-04-18	2024-10-07
2026	2026-05-18	2026-10-14

Every Fixed Threshold

Fixed thresholds at Mt Vernon
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	114	116	1906	50
35 C (95 F): Days	106	45	1901	18
40 C (104 F): Days	10	5	1901	5
90 F (32.2 C): Days	114	86	1901	29
100 F (37.8 C): Days	39	20	1901	4
0 C (32 F): Ice days (max	114	45	1978	12
0 C (32 F): Frost days (min	114	126	1969	29
-10 C (14 F): Days with min	112	45	1963	9
-20 C (-4 F): Days with min	35	9	1918	3
20 C (68 F): Tropical nights (min	114	79	2007	45
25 C (77 F): Days with min	62	17	1898	2
10 mm (0.39 in): Days with 10 mm or more rain	120	55	1907	11
25 mm (0.98 in): Days with 25 mm or more rain	120	22	1979	7
50 mm (1.97 in): Days with 50 mm or more rain	107	8	1957	1
100 mm (3.94 in): Days with 100 mm or more rain	17	1	1906	1
10 cm (3.9 in): Days with 10 cm or more snowfall	60	5	1910	1
25 cm (9.8 in): Days with 25 cm or more snowfall	4	1	1910	1

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1896.

Download the Data

Data for Mt Vernon 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).

Mt Vernon Threshold Days by Year (USC00126001)

Key Facts for Mt Vernon Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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