Mt Vernon 3 SW Threshold Days by Year (USC00235861)

19 fixed thresholds counted per year at Mt Vernon 3 SW (USC00235861): hot days, frost, tropical nights and heavy rain, with the most days in a year.

Key Facts for Mt Vernon 3 SW Thresholds

Mt Vernon 3 SW: days with a maximum temperature at or above 30 C (86 F) in 45 years, most in 1901 with 124.
Mt Vernon 3 SW: days with a maximum temperature at or above 90 F (32.2 C) in 45 years, most in 1901 with 104.
Mt Vernon 3 SW: days with a maximum temperature at or below 0 C (32 F) in 45 years, most in 1905 with 30.
Mt Vernon 3 SW: nights with a minimum temperature at or below 0 C (32 F) in 45 years, most in 1895 with 125.
19 fixed thresholds have at least one qualifying day at Mt Vernon 3 SW.

Days at or above 30 C (86 F)

45 years with a qualifying day

Days per year at Mt Vernon 3 SW with a maximum temperature at or above 30 C (86 F), with the decade average as a line. The most was 124 in 1901.

Days at or above 30 C (86 F) per year at Mt Vernon 3 SW
Year	Days	Decade average
1894	83	95
1895	71	95
1896	80	95
1897	121	95
1898	103	95
1899	112	95
1900	99	91.2
1901	124	91.2
1902	96	91.2
1903	78	91.2
1904	58	91.2
1905	90	91.2
1907	85	91.2
1908	101	91.2
1909	90	91.2
1911	105	89
1912	83	89
1913	96	89
1914	72	89
1938	105	104.5
1939	104	104.5
1940	78	83.8
1941	89	83.8
1942	74	83.8
1946	100	83.8
1947	94	83.8
1949	68	83.8
1950	28	81.4
1951	46	81.4
1952	103	81.4
1953	114	81.4
1954	109	81.4
1955	87	81.4
1956	105	81.4
1957	70	81.4
1958	64	81.4
1959	88	81.4
1960	84	75.6
1961	55	75.6
1962	80	75.6
1963	105	75.6
1964	81	75.6
1965	81	75.6
1966	68	75.6
1967	51	75.6

For each year, a bar from the first to the last day at Mt Vernon 3 SW meeting 30 C (86 F).

First to last qualifying date each year at Mt Vernon 3 SW
Year	First date	Last date
1894	1894-04-16	1894-10-24
1895	1895-04-29	1895-09-26
1896	1896-04-15	1896-10-05
1897	1897-04-27	1897-10-26
1898	1898-04-17	1898-10-08
1899	1899-04-28	1899-10-26
1900	1900-04-26	1900-10-06
1901	1901-04-25	1901-10-21
1902	1902-04-20	1902-10-25
1903	1903-04-09	1903-10-02
1904	1904-05-22	1904-10-15
1905	1905-04-27	1905-09-28
1907	1907-03-18	1907-10-24
1908	1908-05-15	1908-10-18
1909	1909-04-17	1909-10-07
1911	1911-02-01	1911-10-03
1912	1912-05-01	1912-10-09
1913	1913-04-18	1913-10-08
1914	1914-05-25	1914-09-10
1938	1938-05-30	1938-10-17
1939	1939-05-23	1939-10-25
1940	1940-04-01	1940-10-21
1941	1941-04-12	1941-10-22
1942	1942-05-26	1942-10-06
1946	1946-03-31	1946-10-08
1947	1947-05-14	1947-10-21
1949	1949-05-06	1949-09-12
1950	1950-06-10	1950-10-29
1951	1951-04-27	1951-10-04
1952	1952-04-30	1952-10-13
1953	1953-05-21	1953-10-17
1954	1954-05-22	1954-10-05
1955	1955-04-22	1955-09-22
1956	1956-05-06	1956-10-12
1957	1957-05-15	1957-09-19
1958	1958-05-27	1958-10-08
1959	1959-05-01	1959-09-27
1960	1960-05-23	1960-10-11
1961	1961-05-29	1961-09-11
1962	1962-04-29	1962-10-11
1963	1963-04-21	1963-10-22
1964	1964-05-18	1964-10-17
1965	1965-04-21	1965-10-10
1966	1966-05-08	1966-10-14
1967	1967-06-08	1967-10-05

Every Fixed Threshold

Fixed thresholds at Mt Vernon 3 SW
Threshold	Years with a qualifying day	Most days in a year	Year	Latest year days
30 C (86 F): Days	45	124	1901	51
35 C (95 F): Days	44	69	1954	3
40 C (104 F): Days	14	16	1901	2
45 C (113 F): Days	1	1	1954	1
90 F (32.2 C): Days	45	104	1901	14
100 F (37.8 C): Days	33	45	1901	8
110 F (43.3 C): Days	2	5	1954	5
0 C (32 F): Ice days (max	45	30	1905	13
0 C (32 F): Frost days (min	45	125	1895	98
-10 C (14 F): Days with min	45	39	1895	17
-20 C (-4 F): Days with min	20	8	1895	3
-30 C (-22 F): Days with min	2	1	1894	1
20 C (68 F): Tropical nights (min	45	74	1954	15
25 C (77 F): Days with min	16	11	1954	1
10 mm (0.39 in): Days with 10 mm or more rain	44	50	1905	35
25 mm (0.98 in): Days with 25 mm or more rain	44	28	1898	10
50 mm (1.97 in): Days with 50 mm or more rain	42	9	1902	2
100 mm (3.94 in): Days with 100 mm or more rain	11	2	1895	1
10 cm (3.9 in): Days with 10 cm or more snowfall	16	4	1939	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 Mt Vernon 3 SW 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).

Mt Vernon 3 SW Threshold Days by Year (USC00235861)

Key Facts for Mt Vernon 3 SW Thresholds

Days at or above 30 C (86 F)

Every Fixed Threshold

Download the Data

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