Decatur, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 12° 31° -22° (1982) 70° (1989) 1.01" NA
February 17° 37° -22° (1996) 74° (1995) 1.42" NA
March 28° 49° -10° (1998) 86° (1986) 2.67" NA
April 38° 61° 11° (1975) 91° (1989) 3.85" NA
May 51° 72° 29° (1976) 94° (1967) 4.92" NA
June 60° 82° 41° (1969) 104° (1988) 4.26" NA
July 65° 87° 46° (1971) 106° (1980) 4.93" NA
August 63° 85° 44° (1964) 105° (1988) 4.52" NA
September 53° 77° 30° (1995) 100° (2000) 4.34" NA
October 41° 64° 16° (1949) 94° (1963) 3.29" NA
November 28° 48° -11° (1964) 80° (1999) 2.64" NA
December 17° 35° -22° (1989) 68° (1984) 1.52" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 58° 81° 38° (1949) 99° (2000) 0.15" NA
Sep 2 58° 81° 47° (1949) 95° (1975) 0.15" NA
Sep 3 58° 81° 52° (1984) 100° (2000) 0.15" NA
Sep 4 57° 80° 50° (1991) 95° (1990) 0.15" NA
Sep 5 57° 80° 49° (1988) 96° (1990) 0.15" NA
Sep 6 56° 80° 45° (1988) 97° (1990) 0.15" NA
Sep 7 56° 79° 48° (1986) 97° (1978) 0.15" NA
Sep 8 56° 79° 42° (1986) 97° (1983) 0.15" NA
Sep 9 55° 79° 45° (1995) 96° (1983) 0.15" NA
Sep 10 55° 79° 42° (1976) 92° (2002) 0.15" NA
Sep 11 55° 78° 46° (1970) 93° (2000) 0.15" NA
Sep 12 54° 78° 43° (1975) 97° (2000) 0.15" NA
Sep 13 54° 78° 39° (1949) 93° (1998) 0.15" NA
Sep 14 53° 77° 42° (1949) 89° (1994) 0.15" NA
Sep 15 53° 77° 39° (1993) 89° (1948) 0.15" NA
Sep 16 53° 77° 39° (2007) 90° (1978) 0.15" NA
Sep 17 52° 76° 37° (1980) 93° (1983) 0.15" NA
Sep 18 52° 76° 38° (1991) 92° (1948) 0.15" NA
Sep 19 52° 75° 32° (1991) 96° (1948) 0.14" NA
Sep 20 51° 75° 35° (1991) 90° (1948) 0.14" NA
Sep 21 51° 75° 34° (1983) 87° (1973) 0.14" NA
Sep 22 50° 75° 30° (1995) 89° (1988) 0.14" NA
Sep 23 50° 74° 34° (1983) 82° (2004) 0.14" NA
Sep 24 50° 74° 32° (1965) 89° (1984) 0.14" NA
Sep 25 49° 73° 37° (1984) 87° (1967) 0.14" NA
Sep 26 49° 73° 32° (1984) 88° (1990) 0.14" NA
Sep 27 49° 73° 37° (1993) 88° (1971) 0.13" NA
Sep 28 48° 72° 34° (1984) 88° (1971) 0.13" NA
Sep 29 48° 72° 31° (1984) 89° (1981) 0.13" NA
Sep 30 48° 72° 34° (1985) 91° (2002) 0.13" NA
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