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Built 2026-10-19 (19 October 2026)

Mt Vernon Threshold Days by Year (USC00416119)

18 fixed thresholds counted per year at Mt Vernon (USC00416119): 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 a maximum temperature at or above 30 C (86 F) in 59 years, most in 2006 with 164.
  • Mt Vernon: days with a maximum temperature at or above 90 F (32.2 C) in 59 years, most in 2006 with 131.
  • Mt Vernon: nights with a minimum temperature at or below 0 C (32 F) in 59 years, most in 2008 with 74.
  • Mt Vernon: nights with a minimum temperature at or above 20 C (68 F) in 59 years, most in 1998 with 127.
  • 18 fixed thresholds have at least one qualifying day at Mt Vernon.
59 years with a qualifying day
Days at or above 30 C (86 F) per year at Mt Vernon 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 164 in 2006. 0501001502001967: 961968: 991969: 1191970: 1141971: 1031972: 1351973: 1151974: 931975: 1171976: 841977: 1321978: 1361979: 1081980: 1251981: 1161982: 1151983: 1081984: 1191985: 1121986: 1121987: 1311988: 1091989: 891990: 1101991: 1041992: 761993: 1071994: 1081995: 1001996: 1011997: 1001998: 1361999: 1242000: 1162001: 932002: 1232003: 1082004: 1142005: 1412006: 1642007: 1252008: 952009: 952010: 1362011: 1512012: 1332013: 1252014: 1072015: 1252016: 1272017: 1222018: 1402019: 1242020: 1172021: 1252022: 1392024: 1312025: 1352026: 1121967197319791985199119972003200920152021
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 164 in 2006.
Days at or above 30 C (86 F) per year at Mt Vernon
YearDaysDecade average
196796104.7
196899104.7
1969119104.7
1970114113.7
1971103113.7
1972135113.7
1973115113.7
197493113.7
1975117113.7
197684113.7
1977132113.7
1978136113.7
1979108113.7
1980125113.6
1981116113.6
1982115113.6
1983108113.6
1984119113.6
1985112113.6
1986112113.6
1987131113.6
1988109113.6
198989113.6
1990110106.6
1991104106.6
199276106.6
1993107106.6
1994108106.6
1995100106.6
1996101106.6
1997100106.6
1998136106.6
1999124106.6
2000116117.4
200193117.4
2002123117.4
2003108117.4
2004114117.4
2005141117.4
2006164117.4
2007125117.4
200895117.4
200995117.4
2010136129
2011151129
2012133129
2013125129
2014107129
2015125129
2016127129
2017122129
2018140129
2019124129
2020117126.5
2021125126.5
2022139126.5
2024131126.5
2025135126.5
2026112126.5
First to last qualifying date each year at Mt Vernon For each year, a bar from the first to the last day at Mt Vernon meeting 30 C (86 F). 1967: 12 March 1967 to 7 October 19671968: 15 May 1968 to 16 October 19681969: 10 April 1969 to 21 October 19691970: 11 May 1970 to 4 October 19701971: 28 April 1971 to 19 October 19711972: 13 April 1972 to 19 October 19721973: 10 May 1973 to 11 October 19731974: 1 April 1974 to 19 October 19741975: 25 April 1975 to 25 October 19751976: 13 May 1976 to 3 October 19761977: 26 February 1977 to 30 October 19771978: 5 April 1978 to 23 October 19781979: 17 April 1979 to 22 October 19791980: 21 February 1980 to 11 October 19801981: 21 April 1981 to 18 October 19811982: 18 March 1982 to 8 October 19821983: 8 May 1983 to 6 October 19831984: 21 April 1984 to 26 September 19841985: 26 May 1985 to 14 October 19851986: 13 May 1986 to 5 October 19861987: 12 April 1987 to 28 September 19871988: 1 June 1988 to 19 October 19881989: 4 April 1989 to 17 October 19891990: 30 April 1990 to 8 October 19901991: 6 March 1991 to 13 October 19911992: 13 May 1992 to 27 October 19921993: 16 May 1993 to 4 October 19931994: 28 April 1994 to 8 October 19941995: 24 March 1995 to 17 October 19951996: 21 February 1996 to 24 September 19961997: 3 May 1997 to 7 October 19971998: 30 March 1998 to 6 October 19981999: 9 May 1999 to 17 October 19992000: 9 May 2000 to 6 October 20002001: 5 April 2001 to 20 September 20012002: 18 April 2002 to 7 October 20022003: 30 April 2003 to 25 October 20032004: 18 May 2004 to 22 October 20042005: 29 April 2005 to 10 November 20052006: 2 March 2006 to 11 November 20062007: 2 April 2007 to 16 October 20072008: 10 May 2008 to 13 September 20082009: 23 April 2009 to 9 October 20092010: 4 May 2010 to 11 October 20102011: 20 March 2011 to 18 October 20112012: 2 April 2012 to 14 October 20122013: 16 April 2013 to 5 October 20132014: 22 March 2014 to 26 October 20142015: 27 April 2015 to 16 October 20152016: 15 March 2016 to 17 November 20162017: 24 February 2017 to 6 November 20172018: 7 May 2018 to 8 October 20182019: 10 April 2019 to 11 October 20192020: 26 March 2020 to 23 October 20202021: 13 April 2021 to 26 October 20212022: 28 March 2022 to 22 October 20222024: 27 February 2024 to 29 October 20242025: 14 April 2025 to 18 October 20252026: 21 March 2026 to 26 September 202619671975198319911999200720152024JanFebMarAprMayJunJulAugSepOctNovDec
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
YearFirst dateLast date
19671967-03-121967-10-07
19681968-05-151968-10-16
19691969-04-101969-10-21
19701970-05-111970-10-04
19711971-04-281971-10-19
19721972-04-131972-10-19
19731973-05-101973-10-11
19741974-04-011974-10-19
19751975-04-251975-10-25
19761976-05-131976-10-03
19771977-02-261977-10-30
19781978-04-051978-10-23
19791979-04-171979-10-22
19801980-02-211980-10-11
19811981-04-211981-10-18
19821982-03-181982-10-08
19831983-05-081983-10-06
19841984-04-211984-09-26
19851985-05-261985-10-14
19861986-05-131986-10-05
19871987-04-121987-09-28
19881988-06-011988-10-19
19891989-04-041989-10-17
19901990-04-301990-10-08
19911991-03-061991-10-13
19921992-05-131992-10-27
19931993-05-161993-10-04
19941994-04-281994-10-08
19951995-03-241995-10-17
19961996-02-211996-09-24
19971997-05-031997-10-07
19981998-03-301998-10-06
19991999-05-091999-10-17
20002000-05-092000-10-06
20012001-04-052001-09-20
20022002-04-182002-10-07
20032003-04-302003-10-25
20042004-05-182004-10-22
20052005-04-292005-11-10
20062006-03-022006-11-11
20072007-04-022007-10-16
20082008-05-102008-09-13
20092009-04-232009-10-09
20102010-05-042010-10-11
20112011-03-202011-10-18
20122012-04-022012-10-14
20132013-04-162013-10-05
20142014-03-222014-10-26
20152015-04-272015-10-16
20162016-03-152016-11-17
20172017-02-242017-11-06
20182018-05-072018-10-08
20192019-04-102019-10-11
20202020-03-262020-10-23
20212021-04-132021-10-26
20222022-03-282022-10-22
20242024-02-272024-10-29
20252025-04-142025-10-18
20262026-03-212026-09-26

Every Fixed Threshold

Fixed thresholds at Mt Vernon
ThresholdYears with a qualifying dayMost days in a yearYearLatest year days
30 C (86 F): Days591642006112
35 C (95 F): Days58102201156
40 C (104 F): Days263620116
90 F (32.2 C): Days59131200688
100 F (37.8 C): Days4874201127
110 F (43.3 C): Days1420114
0 C (32 F): Ice days (max481419784
0 C (32 F): Frost days (min5974200826
-10 C (14 F): Days with min291219793
-20 C (-4 F): Days with min1119891
20 C (68 F): Tropical nights (min591271998107
25 C (77 F): Days with min4746201123
10 mm (0.39 in): Days with 10 mm or more rain5949197322
25 mm (0.98 in): Days with 25 mm or more rain592820096
50 mm (1.97 in): Days with 50 mm or more rain581120001
100 mm (3.94 in): Days with 100 mm or more rain25420151
200 mm (7.87 in): Days with 200 mm or more rain1120151
10 cm (3.9 in): Days with 10 cm or more snowfall7119771

Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1967.

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 . Last revised (2026-10-17).