Williamson, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 11° 32° -28° (1999) 68° (2003) 0.86" 6.1"
February 15° 37° -38° (1996) 73° (1972) 1.33" 6.3"
March 25° 49° -32° (1962) 87° (1986) 2.23" 4.1"
April 36° 62° 8° (1982) 90° (1970) 3.76" 0.7"
May 47° 71° 24° (2005) 94° (1967) 5.05" 0"
June 58° 81° 34° (1969) 102° (1988) 5.01" 0"
July 63° 85° 39° (1972) 106° (1956) 4.81" 0"
August 60° 84° 35° (1950) 104° (1954) 4.41" 0"
September 50° 76° 23° (1949) 100° (1953) 3.83" 0"
October 38° 64° 11° (1997) 95° (1963) 2.89" 0.2"
November 27° 49° -13° (1991) 80° (1950) 2.21" 1.4"
December 15° 35° -31° (1989) 69° (1984) 1.18" 4.4"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 20° 40° 4° (1985) 65° (1970) 0.05" 0.1"
Dec 2 20° 40° -1° (1966) 66° (1962) 0.05" 0.2"
Dec 3 19° 39° -6° (1985) 63° (1956) 0.05" 0.1"
Dec 4 19° 39° 0° (1991) 65° (1998) 0.04" 0.1"
Dec 5 18° 38° -5° (2005) 67° (1998) 0.05" 0.2"
Dec 6 18° 38° -6° (1950) 66° (2001) 0.04" 0.1"
Dec 7 18° 37° -9° (1976) 59° (1984) 0.05" 0.1"
Dec 8 17° 37° -12° (1976) 60° (1991) 0.04" 0.2"
Dec 9 17° 37° -14° (1958) 56° (1991) 0.05" 0.1"
Dec 10 17° 36° -9° (1995) 61° (1979) 0.04" 0.2"
Dec 11 16° 36° -6° (1972) 65° (1965) 0.05" 0.1"
Dec 12 16° 36° -20° (1989) 62° (1965) 0.04" 0.1"
Dec 13 16° 35° -22° (1961) 60° (1975) 0.04" 0.2"
Dec 14 15° 35° -20° (1985) 60° (1975) 0.04" 0.1"
Dec 15 15° 35° -14° (1989) 58° (2006) 0.03" 0.2"
Dec 16 15° 34° -20° (1951) 62° (2002) 0.04" 0.1"
Dec 17 15° 34° -8° (1964) 60° (2006) 0.03" 0.1"
Dec 18 15° 34° -19° (1985) 63° (1976) 0.04" 0.1"
Dec 19 14° 34° -17° (1983) 62° (2002) 0.03" 0.2"
Dec 20 14° 34° -15° (1989) 54° (1988) 0.04" 0.1"
Dec 21 14° 33° -21° (1985) 56° (1979) 0.03" 0.2"
Dec 22 14° 33° -22° (1989) 58° (1965) 0.04" 0.1"
Dec 23 14° 33° -31° (1989) 61° (1964) 0.03" 0.2"
Dec 24 13° 33° -25° (1989) 56° (1955) 0.03" 0.1"
Dec 25 13° 33° -21° (2000) 64° (1982) 0.04" 0.2"
Dec 26 13° 33° -21° (1962) 56° (1960) 0.03" 0.2"
Dec 27 13° 33° -18° (1951) 56° (1976) 0.03" 0.1"
Dec 28 13° 32° -15° (2000) 69° (1984) 0.03" 0.2"
Dec 29 13° 32° -11° (1976) 68° (1984) 0.02" 0.1"
Dec 30 13° 32° -11° (1961) 62° (1965) 0.03" 0.2"
Dec 31 13° 32° -17° (1976) 65° (2004) 0.03" 0.1"
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