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
Sep 1 57° 81° 33° (1949) 99° (1953) 0.13" 0"
Sep 2 56° 81° 41° (1965) 98° (1953) 0.14" 0"
Sep 3 56° 81° 36° (1974) 97° (2000) 0.12" 0"
Sep 4 56° 80° 33° (1974) 97° (2000) 0.13" 0"
Sep 5 55° 80° 36° (1962) 94° (1954) 0.13" 0"
Sep 6 55° 80° 36° (1962) 95° (1990) 0.14" 0"
Sep 7 54° 79° 36° (1953) 96° (1978) 0.14" 0"
Sep 8 54° 79° 36° (1986) 94° (1971) 0.13" 0"
Sep 9 53° 79° 37° (1995) 99° (1955) 0.14" 0"
Sep 10 53° 78° 34° (1976) 95° (1983) 0.13" 0"
Sep 11 52° 78° 36° (1959) 91° (1953) 0.13" 0"
Sep 12 52° 78° 32° (1955) 97° (2000) 0.12" 0"
Sep 13 52° 77° 35° (2007) 93° (1956) 0.13" 0"
Sep 14 51° 77° 33° (1974) 94° (1955) 0.13" 0"
Sep 15 51° 76° 31° (2007) 96° (1955) 0.12" 0"
Sep 16 50° 76° 34° (1984) 93° (1955) 0.13" 0"
Sep 17 50° 76° 35° (1999) 95° (1953) 0.13" 0"
Sep 18 49° 75° 34° (1981) 95° (1955) 0.12" 0"
Sep 19 49° 75° 31° (1991) 96° (1948) 0.13" 0"
Sep 20 48° 74° 28° (1991) 90° (1972) 0.13" 0"
Sep 21 48° 74° 29° (1999) 89° (1956) 0.13" 0"
Sep 22 47° 74° 27° (1974) 88° (1988) 0.13" 0"
Sep 23 47° 73° 29° (1983) 84° (1976) 0.12" 0"
Sep 24 46° 73° 28° (1989) 90° (1984) 0.12" 0"
Sep 25 46° 72° 31° (1989) 90° (1956) 0.12" 0"
Sep 26 45° 72° 30° (1975) 93° (1956) 0.13" 0"
Sep 27 45° 72° 31° (1989) 92° (1956) 0.12" 0"
Sep 28 44° 71° 30° (1951) 100° (1953) 0.13" 0"
Sep 29 44° 71° 23° (1949) 93° (1953) 0.12" 0"
Sep 30 44° 70° 25° (1984) 92° (1952) 0.11" 0"
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