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
Aug 1 65° 87° 56° (1968) 101° (1980) 0.15" NA
Aug 2 65° 87° 55° (1948) 101° (1983) 0.15" NA
Aug 3 65° 87° 54° (1948) 100° (1983) 0.15" NA
Aug 4 65° 87° 50° (1978) 97° (1983) 0.15" NA
Aug 5 65° 87° 51° (1994) 98° (1983) 0.15" NA
Aug 6 65° 87° 53° (1990) 100° (1984) 0.15" NA
Aug 7 65° 86° 49° (1989) 101° (1988) 0.15" NA
Aug 8 64° 86° 54° (1976) 103° (1988) 0.15" NA
Aug 9 64° 86° 52° (1972) 101° (1980) 0.15" NA
Aug 10 64° 86° 53° (1967) 99° (1983) 0.15" NA
Aug 11 64° 86° 50° (1982) 97° (1988) 0.15" NA
Aug 12 64° 86° 48° (1964) 98° (1975) 0.15" NA
Aug 13 64° 86° 44° (1964) 97° (1980) 0.14" NA
Aug 14 63° 85° 50° (1994) 100° (1988) 0.14" NA
Aug 15 63° 85° 51° (2004) 105° (1988) 0.14" NA
Aug 16 63° 85° 52° (2004) 105° (1983) 0.14" NA
Aug 17 63° 85° 54° (1963) 105° (1983) 0.14" NA
Aug 18 63° 85° 51° (1981) 102° (1983) 0.14" NA
Aug 19 62° 84° 51° (1967) 104° (2003) 0.14" NA
Aug 20 62° 84° 48° (1967) 98° (1983) 0.14" NA
Aug 21 62° 84° 52° (1949) 100° (2003) 0.14" NA
Aug 22 61° 84° 52° (1966) 98° (2003) 0.14" NA
Aug 23 61° 84° 47° (1966) 97° (1971) 0.14" NA
Aug 24 61° 83° 50° (1966) 97° (1983) 0.14" NA
Aug 25 61° 83° 52° (1964) 101° (2003) 0.14" NA
Aug 26 60° 83° 51° (1964) 103° (1983) 0.15" NA
Aug 27 60° 83° 47° (1986) 102° (2003) 0.15" NA
Aug 28 60° 82° 45° (1986) 102° (1984) 0.15" NA
Aug 29 59° 82° 48° (1988) 104° (1984) 0.15" NA
Aug 30 59° 82° 54° (1967) 96° (1995) 0.15" NA
Aug 31 59° 82° 45° (1967) 95° (2000) 0.15" NA
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