Decatur, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 14° 32° -22° (1982) 70° (1989) 0.97" 5.8"
February 18° 38° -22° (1996) 74° (1995) 1.54" 5.6"
March 29° 49° -10° (1998) 86° (1986) 2.6" 4"
April 40° 62° 11° (1975) 91° (1989) 3.96" 0.9"
May 52° 72° 29° (1976) 94° (1967) 5.69" 0"
June 62° 82° 41° (1969) 104° (1988) 5.21" 0"
July 66° 86° 46° (1971) 106° (1980) 5.1" 0"
August 64° 85° 44° (1964) 105° (1988) 4.52" 0"
September 54° 77° 30° (1995) 100° (2000) 4.19" 0"
October 42° 64° 16° (1949) 94° (1963) 3.34" 0.2"
November 30° 49° -11° (1964) 80° (1999) 2.4" 1.5"
December 18° 35° -22° (1989) 68° (1984) 1.58" 5.8"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 46° 67° 30° (1966) 89° (1968) 0.16" 0"
May 2 47° 68° 30° (1967) 90° (1968) 0.17" 0"
May 3 47° 68° 29° (1976) 85° (1949) 0.17" 0"
May 4 47° 68° 34° (2004) 86° (1949) 0.18" 0"
May 5 48° 68° 35° (1989) 89° (1966) 0.17" 0"
May 6 48° 69° 34° (1989) 83° (2002) 0.17" 0"
May 7 49° 69° 36° (1989) 90° (1966) 0.17" 0"
May 8 49° 69° 33° (1980) 89° (1963) 0.18" 0"
May 9 49° 70° 35° (1966) 89° (1963) 0.19" 0"
May 10 50° 70° 31° (1966) 83° (2001) 0.18" 0"
May 11 50° 70° 35° (1981) 87° (2005) 0.19" 0"
May 12 51° 71° 37° (1966) 92° (2000) 0.19" 0"
May 13 51° 71° 33° (1997) 88° (1991) 0.19" 0"
May 14 51° 71° 36° (1966) 91° (1988) 0.19" 0"
May 15 52° 71° 38° (1983) 86° (2001) 0.19" 0"
May 16 52° 72° 41° (1997) 87° (1964) 0.18" 0"
May 17 52° 72° 41° (1968) 89° (1964) 0.19" 0"
May 18 53° 72° 36° (2002) 89° (1996) 0.19" 0"
May 19 53° 73° 41° (1968) 87° (1975) 0.19" 0"
May 20 54° 73° 40° (1963) 90° (1998) 0.19" 0"
May 21 54° 73° 39° (1967) 89° (1964) 0.19" 0"
May 22 54° 74° 36° (1963) 90° (1970) 0.18" 0"
May 23 55° 74° 38° (1963) 90° (1967) 0.19" 0"
May 24 55° 74° 42° (2001) 93° (1967) 0.19" 0"
May 25 55° 75° 43° (1992) 94° (1967) 0.19" 0"
May 26 56° 75° 42° (1992) 90° (1967) 0.18" 0"
May 27 56° 75° 40° (1992) 88° (1966) 0.19" 0"
May 28 56° 76° 42° (1992) 91° (2006) 0.18" 0"
May 29 57° 76° 42° (1965) 90° (1991) 0.19" 0"
May 30 57° 76° 44° (1983) 90° (1989) 0.19" 0"
May 31 57° 77° 42° (1972) 91° (2000) 0.19" 0"
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