Station:(420086) ALTON | |||||||||||||||
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From Year=1915 To Year=2012 | |||||||||||||||
Monthly Averages | Daily Extremes | Monthly Extremes | Max. Temp. | Min. Temp. | |||||||||||
Max. | Min. | Mean | High | Date | Low | Date | Highest Mean |
Year | Lowest Mean |
Year | >= 90 F |
<= 32 F |
<= 32 F |
<= 0 F |
|
F | F | F | F | dd/yyyy or yyyymmdd |
F | dd/yyyy or yyyymmdd |
F | - | F | - | # Days | # Days | # Days | # Days | |
January | 39.4 | 15.1 | 27.3 | 64 | 19/1920 | -20 | 30/1979 | 37.0 | 2003 | 11.2 | 1937 | 0.0 | 6.9 | 30.6 | 2.1 |
February | 42.1 | 17.6 | 29.9 | 68 | 25/1986 | -17 | 10/1933 | 37.1 | 1995 | 18.0 | 1939 | 0.0 | 4.0 | 27.8 | 1.2 |
March | 47.8 | 21.9 | 34.9 | 76 | 31/1966 | -7 | 11/1962 | 45.4 | 1934 | 26.8 | 1952 | 0.0 | 1.7 | 29.4 | 0.2 |
April | 57.5 | 28.0 | 42.7 | 81 | 30/1981 | -2 | 01/1920 | 49.6 | 1992 | 35.1 | 1975 | 0.0 | 0.2 | 22.5 | 0.0 |
May | 67.1 | 34.9 | 51.0 | 90 | 30/2002 | 5 | 03/1915 | 57.1 | 1984 | 41.6 | 1930 | 0.0 | 0.0 | 11.0 | 0.0 |
June | 76.8 | 42.2 | 59.5 | 95 | 23/1961 | 23 | 02/1955 | 64.8 | 2002 | 53.5 | 1915 | 0.7 | 0.0 | 1.8 | 0.0 |
July | 82.3 | 50.1 | 66.2 | 99 | 05/1996 | 25 | 01/1948 | 72.1 | 2007 | 60.1 | 1918 | 2.7 | 0.0 | 0.0 | 0.0 |
August | 80.0 | 48.9 | 64.4 | 95 | 12/2002 | 32 | 30/1942 | 69.2 | 1958 | 58.2 | 1918 | 1.3 | 0.0 | 0.0 | 0.0 |
September | 73.5 | 41.8 | 57.7 | 91 | 06/1955 | 20 | 18/1965 | 62.1 | 1956 | 52.1 | 1965 | 0.1 | 0.0 | 2.1 | 0.0 |
October | 62.6 | 32.9 | 47.8 | 84 | 01/2010 | -2 | 30/1971 | 55.0 | 2003 | 39.2 | 1919 | 0.0 | 0.1 | 14.2 | 0.0 |
November | 50.0 | 23.1 | 36.6 | 74 | 03/2010 | -5 | 23/1931 | 43.5 | 1949 | 29.3 | 1994 | 0.0 | 1.5 | 27.7 | 0.2 |
December | 41.5 | 16.8 | 29.1 | 67 | 09/1962 | -24 | 22/1990 | 38.4 | 1950 | 20.6 | 1932 | 0.0 | 5.7 | 30.5 | 1.4 |
Annual | 60.0 | 31.1 | 45.6 | 99 | 19960705 | -24 | 19901222 | 48.4 | 2003 | 43.2 | 1932 | 4.8 | 20.1 | 197.8 | 5.0 |
Winter | 41.0 | 16.5 | 28.8 | 68 | 19860225 | -24 | 19901222 | 35.4 | 1981 | 19.9 | 1933 | 0.0 | 16.6 | 88.9 | 4.6 |
Spring | 57.4 | 28.3 | 42.9 | 90 | 20020530 | -7 | 19620311 | 49.5 | 1934 | 36.7 | 1917 | 0.0 | 1.9 | 63.0 | 0.2 |
Summer | 79.7 | 47.0 | 63.3 | 99 | 19960705 | 23 | 19550602 | 67.9 | 2007 | 58.9 | 1915 | 4.7 | 0.0 | 1.9 | 0.0 |
Fall | 62.1 | 32.6 | 47.3 | 91 | 19550906 | -5 | 19311123 | 51.1 | 1995 | 43.3 | 1925 | 0.1 | 1.6 | 44.0 | 0.2 |
Winter = Dec., Jan., and Feb. | Spring = Mar., Apr., and May | |
Summer = Jun., Jul., and Aug. | Fall = Sep., Oct., and Nov. |