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
May 1 45° 67° 30° (1966) 89° (1968) 0.15" NA
May 2 45° 67° 30° (1967) 90° (1968) 0.15" NA
May 3 46° 67° 29° (1976) 85° (1949) 0.16" NA
May 4 46° 68° 34° (2004) 86° (1949) 0.16" NA
May 5 47° 68° 35° (1989) 89° (1966) 0.16" NA
May 6 47° 68° 34° (1989) 83° (2002) 0.16" NA
May 7 47° 69° 36° (1989) 90° (1966) 0.16" NA
May 8 48° 69° 33° (1980) 89° (1963) 0.16" NA
May 9 48° 69° 35° (1966) 89° (1963) 0.16" NA
May 10 49° 70° 31° (1966) 83° (2001) 0.16" NA
May 11 49° 70° 35° (1981) 87° (2005) 0.16" NA
May 12 49° 71° 37° (1966) 92° (2000) 0.16" NA
May 13 50° 71° 33° (1997) 88° (1991) 0.16" NA
May 14 50° 71° 36° (1966) 91° (1988) 0.16" NA
May 15 51° 72° 38° (1983) 86° (2001) 0.16" NA
May 16 51° 72° 41° (1997) 87° (1964) 0.16" NA
May 17 51° 72° 41° (1968) 89° (1964) 0.16" NA
May 18 52° 73° 36° (2002) 89° (1996) 0.16" NA
May 19 52° 73° 41° (1968) 87° (1975) 0.16" NA
May 20 52° 73° 40° (1963) 90° (1998) 0.16" NA
May 21 53° 74° 39° (1967) 89° (1964) 0.16" NA
May 22 53° 74° 36° (1963) 90° (1970) 0.16" NA
May 23 54° 74° 38° (1963) 90° (1967) 0.16" NA
May 24 54° 75° 42° (2001) 93° (1967) 0.16" NA
May 25 54° 75° 43° (1992) 94° (1967) 0.16" NA
May 26 55° 75° 42° (1992) 90° (1967) 0.16" NA
May 27 55° 76° 40° (1992) 88° (1966) 0.16" NA
May 28 55° 76° 42° (1992) 91° (2006) 0.16" NA
May 29 55° 76° 42° (1965) 90° (1991) 0.16" NA
May 30 56° 77° 44° (1983) 90° (1989) 0.15" NA
May 31 56° 77° 42° (1972) 91° (2000) 0.15" NA
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