Williamson, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 30° -28° (1999) 68° (2003) 0.91" 6.7"
February 15° 36° -38° (1996) 73° (1972) 1.19" 6.4"
March 26° 48° -32° (1962) 87° (1986) 2.26" 4.8"
April 36° 60° 8° (1982) 90° (1970) 3.52" 2"
May 48° 71° 24° (2005) 94° (1967) 4.65" 0"
June 58° 81° 34° (1969) 102° (1988) 4.76" 0"
July 63° 86° 39° (1972) 106° (1956) 4.7" 0"
August 61° 84° 35° (1950) 104° (1954) 3.96" 0"
September 51° 76° 23° (1949) 100° (1953) 4.31" 0"
October 39° 64° 11° (1997) 95° (1963) 2.94" 0.1"
November 27° 47° -13° (1991) 80° (1950) 2.37" 1.8"
December 16° 34° -31° (1989) 69° (1984) 1.19" 4.7"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 56° 80° 33° (1949) 99° (1953) 0.14" NA
Sep 2 56° 80° 41° (1965) 98° (1953) 0.14" NA
Sep 3 56° 80° 36° (1974) 97° (2000) 0.14" NA
Sep 4 55° 79° 33° (1974) 97° (2000) 0.14" NA
Sep 5 55° 79° 36° (1962) 94° (1954) 0.15" NA
Sep 6 55° 79° 36° (1962) 95° (1990) 0.15" NA
Sep 7 54° 79° 36° (1953) 96° (1978) 0.15" NA
Sep 8 54° 78° 36° (1986) 94° (1971) 0.15" NA
Sep 9 53° 78° 37° (1995) 99° (1955) 0.15" NA
Sep 10 53° 78° 34° (1976) 95° (1983) 0.15" NA
Sep 11 53° 77° 36° (1959) 91° (1953) 0.15" NA
Sep 12 52° 77° 32° (1955) 97° (2000) 0.15" NA
Sep 13 52° 77° 35° (2007) 93° (1956) 0.15" NA
Sep 14 52° 76° 33° (1974) 94° (1955) 0.15" NA
Sep 15 51° 76° 31° (2007) 96° (1955) 0.15" NA
Sep 16 51° 76° 34° (1984) 93° (1955) 0.15" NA
Sep 17 50° 75° 35° (1999) 95° (1953) 0.15" NA
Sep 18 50° 75° 34° (1981) 95° (1955) 0.15" NA
Sep 19 50° 75° 31° (1991) 96° (1948) 0.15" NA
Sep 20 49° 75° 28° (1991) 90° (1972) 0.15" NA
Sep 21 49° 74° 29° (1999) 89° (1956) 0.14" NA
Sep 22 48° 74° 27° (1974) 88° (1988) 0.14" NA
Sep 23 48° 74° 29° (1983) 84° (1976) 0.14" NA
Sep 24 48° 73° 28° (1989) 90° (1984) 0.14" NA
Sep 25 47° 73° 31° (1989) 90° (1956) 0.14" NA
Sep 26 47° 73° 30° (1975) 93° (1956) 0.14" NA
Sep 27 46° 72° 31° (1989) 92° (1956) 0.13" NA
Sep 28 46° 72° 30° (1951) 100° (1953) 0.13" NA
Sep 29 46° 72° 23° (1949) 93° (1953) 0.13" NA
Sep 30 45° 71° 25° (1984) 92° (1952) 0.12" NA
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