Mt Vernon Threshold Days by Year (USC00155648)
17 fixed thresholds counted per year at Mt Vernon (USC00155648): 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 56 years, most in 1972 with 67.
- Mt Vernon: days with 25 mm (0.98 in) or more of precipitation in 56 years, most in 1994 with 23.
- Mt Vernon: days with a maximum temperature at or above 30 C (86 F) in 55 years, most in 1980 with 94.
- Mt Vernon: days with a maximum temperature at or below 0 C (32 F) in 55 years, most in 2010 with 43.
- 17 fixed thresholds have at least one qualifying day at Mt Vernon.
Days at or above 30 C (86 F)
55 years with a qualifying day| Year | Days | Decade average |
|---|---|---|
| 1957 | 65 | 67 |
| 1958 | 49 | 67 |
| 1959 | 87 | 67 |
| 1963 | 44 | 56.6 |
| 1964 | 77 | 56.6 |
| 1965 | 68 | 56.6 |
| 1966 | 61 | 56.6 |
| 1967 | 25 | 56.6 |
| 1968 | 56 | 56.6 |
| 1969 | 65 | 56.6 |
| 1970 | 76 | 58.2 |
| 1971 | 44 | 58.2 |
| 1972 | 31 | 58.2 |
| 1973 | 75 | 58.2 |
| 1974 | 50 | 58.2 |
| 1975 | 80 | 58.2 |
| 1976 | 41 | 58.2 |
| 1977 | 67 | 58.2 |
| 1978 | 75 | 58.2 |
| 1979 | 43 | 58.2 |
| 1980 | 94 | 63.8 |
| 1981 | 38 | 63.8 |
| 1982 | 46 | 63.8 |
| 1983 | 78 | 63.8 |
| 1984 | 66 | 63.8 |
| 1985 | 50 | 63.8 |
| 1986 | 74 | 63.8 |
| 1987 | 77 | 63.8 |
| 1988 | 75 | 63.8 |
| 1989 | 40 | 63.8 |
| 1990 | 47 | 42.4 |
| 1991 | 53 | 42.4 |
| 1992 | 18 | 42.4 |
| 1993 | 57 | 42.4 |
| 1994 | 28 | 42.4 |
| 1995 | 53 | 42.4 |
| 1996 | 34 | 42.4 |
| 1997 | 31 | 42.4 |
| 1998 | 61 | 42.4 |
| 2000 | 32 | 42.3 |
| 2001 | 43 | 42.3 |
| 2002 | 57 | 42.3 |
| 2003 | 23 | 42.3 |
| 2004 | 18 | 42.3 |
| 2005 | 58 | 42.3 |
| 2006 | 43 | 42.3 |
| 2007 | 78 | 42.3 |
| 2008 | 54 | 42.3 |
| 2009 | 17 | 42.3 |
| 2010 | 69 | 43.5 |
| 2011 | 59 | 43.5 |
| 2012 | 51 | 43.5 |
| 2013 | 17 | 43.5 |
| 2014 | 28 | 43.5 |
| 2015 | 37 | 43.5 |
| Year | First date | Last date |
|---|---|---|
| 1957 | 1957-04-26 | 1957-09-21 |
| 1958 | 1958-05-31 | 1958-09-26 |
| 1959 | 1959-05-02 | 1959-10-08 |
| 1963 | 1963-05-09 | 1963-09-20 |
| 1964 | 1964-05-18 | 1964-09-21 |
| 1965 | 1965-04-23 | 1965-09-22 |
| 1966 | 1966-05-08 | 1966-09-03 |
| 1967 | 1967-05-26 | 1967-09-20 |
| 1968 | 1968-05-15 | 1968-09-23 |
| 1969 | 1969-05-05 | 1969-10-12 |
| 1970 | 1970-04-19 | 1970-09-25 |
| 1971 | 1971-05-18 | 1971-10-01 |
| 1972 | 1972-05-25 | 1972-09-22 |
| 1973 | 1973-06-03 | 1973-10-04 |
| 1974 | 1974-05-14 | 1974-09-11 |
| 1975 | 1975-05-20 | 1975-09-10 |
| 1976 | 1976-04-20 | 1976-08-29 |
| 1977 | 1977-04-16 | 1977-09-05 |
| 1978 | 1978-05-25 | 1978-09-22 |
| 1979 | 1979-05-07 | 1979-09-04 |
| 1980 | 1980-04-23 | 1980-10-10 |
| 1981 | 1981-06-06 | 1981-09-01 |
| 1982 | 1982-05-13 | 1982-09-15 |
| 1983 | 1983-06-12 | 1983-09-20 |
| 1984 | 1984-04-27 | 1984-09-23 |
| 1985 | 1985-04-22 | 1985-09-12 |
| 1986 | 1986-04-27 | 1986-10-01 |
| 1987 | 1987-05-18 | 1987-10-26 |
| 1988 | 1988-04-06 | 1988-09-24 |
| 1989 | 1989-04-27 | 1989-09-10 |
| 1990 | 1990-04-27 | 1990-09-08 |
| 1991 | 1991-05-16 | 1991-09-19 |
| 1992 | 1992-06-18 | 1992-09-10 |
| 1993 | 1993-05-09 | 1993-09-15 |
| 1994 | 1994-06-14 | 1994-09-17 |
| 1995 | 1995-06-09 | 1995-09-09 |
| 1996 | 1996-05-19 | 1996-08-24 |
| 1997 | 1997-06-21 | 1997-09-20 |
| 1998 | 1998-05-16 | 1998-10-06 |
| 2000 | 2000-05-07 | 2000-09-02 |
| 2001 | 2001-05-07 | 2001-09-10 |
| 2002 | 2002-06-03 | 2002-09-21 |
| 2003 | 2003-06-25 | 2003-09-02 |
| 2004 | 2004-06-12 | 2004-09-24 |
| 2005 | 2005-06-06 | 2005-10-06 |
| 2006 | 2006-05-29 | 2006-08-28 |
| 2007 | 2007-05-02 | 2007-10-09 |
| 2008 | 2008-06-05 | 2008-10-13 |
| 2009 | 2009-04-27 | 2009-08-27 |
| 2010 | 2010-04-03 | 2010-09-25 |
| 2011 | 2011-05-13 | 2011-09-15 |
| 2012 | 2012-03-21 | 2012-09-08 |
| 2013 | 2013-05-31 | 2013-09-11 |
| 2014 | 2014-06-16 | 2014-09-03 |
| 2015 | 2015-05-09 | 2015-09-09 |
Every Fixed Threshold
| Threshold | Years with a qualifying day | Most days in a year | Year | Latest year days |
|---|---|---|---|---|
| 30 C (86 F): Days | 55 | 94 | 1980 | 37 |
| 35 C (95 F): Days | 22 | 26 | 1980 | 1 |
| 90 F (32.2 C): Days | 52 | 67 | 1980 | 4 |
| 100 F (37.8 C): Days | 5 | 3 | 1988 | 2 |
| 0 C (32 F): Ice days (max | 55 | 43 | 2010 | 25 |
| 0 C (32 F): Frost days (min | 55 | 134 | 1988 | 101 |
| -10 C (14 F): Days with min | 55 | 35 | 1963 | 23 |
| -20 C (-4 F): Days with min | 27 | 6 | 1970 | 5 |
| -30 C (-22 F): Days with min | 1 | 2 | 1994 | 2 |
| 20 C (68 F): Tropical nights (min | 55 | 45 | 2002 | 23 |
| 25 C (77 F): Days with min | 1 | 1 | 2014 | 1 |
| 10 mm (0.39 in): Days with 10 mm or more rain | 56 | 67 | 1972 | 53 |
| 25 mm (0.98 in): Days with 25 mm or more rain | 56 | 23 | 1994 | 11 |
| 50 mm (1.97 in): Days with 50 mm or more rain | 52 | 5 | 1957 | 1 |
| 100 mm (3.94 in): Days with 100 mm or more rain | 2 | 1 | 1974 | 1 |
| 10 cm (3.9 in): Days with 10 cm or more snowfall | 28 | 4 | 1963 | 1 |
| 25 cm (9.8 in): Days with 25 cm or more snowfall | 3 | 1 | 1979 | 1 |
Years with under 90 percent of days observed are left out of the most days column. Threshold history at this station starts in 1957.
Download the Data
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 (2025-12-31).