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
Oct 1 47° 71° 31° (1985) 91° (2002) 0.13" NA
Oct 2 47° 71° 31° (2004) 90° (1963) 0.12" NA
Oct 3 46° 70° 30° (2004) 87° (2006) 0.12" NA
Oct 4 46° 70° 30° (1999) 91° (1997) 0.12" NA
Oct 5 46° 70° 29° (1999) 94° (1963) 0.12" NA
Oct 6 45° 69° 30° (1991) 92° (1963) 0.12" NA
Oct 7 45° 69° 26° (2000) 87° (1949) 0.11" NA
Oct 8 45° 68° 25° (2000) 84° (1949) 0.11" NA
Oct 9 44° 68° 24° (2000) 83° (1949) 0.11" NA
Oct 10 44° 67° 27° (2000) 90° (1963) 0.11" NA
Oct 11 43° 67° 25° (1987) 84° (1962) 0.11" NA
Oct 12 43° 66° 30° (1980) 87° (1975) 0.11" NA
Oct 13 43° 66° 28° (2006) 86° (1989) 0.11" NA
Oct 14 42° 66° 28° (2006) 86° (1963) 0.1" NA
Oct 15 42° 65° 28° (2006) 85° (1963) 0.1" NA
Oct 16 41° 65° 27° (1976) 86° (1999) 0.1" NA
Oct 17 41° 64° 22° (1948) 82° (1965) 0.1" NA
Oct 18 40° 64° 23° (1972) 81° (1965) 0.1" NA
Oct 19 40° 63° 18° (1972) 85° (1963) 0.1" NA
Oct 20 40° 63° 26° (1964) 85° (2003) 0.1" NA
Oct 21 39° 62° 26° (1976) 85° (2003) 0.1" NA
Oct 22 39° 61° 20° (1976) 81° (1963) 0.1" NA
Oct 23 38° 61° 21° (1981) 82° (1963) 0.1" NA
Oct 24 38° 60° 25° (2006) 80° (1989) 0.1" NA
Oct 25 37° 60° 25° (2006) 79° (1963) 0.1" NA
Oct 26 37° 59° 24° (1949) 81° (1963) 0.1" NA
Oct 27 37° 59° 18° (1997) 79° (1966) 0.1" NA
Oct 28 36° 58° 18° (1997) 83° (1999) 0.1" NA
Oct 29 36° 58° 22° (1980) 76° (1990) 0.1" NA
Oct 30 35° 57° 23° (1991) 79° (2004) 0.09" NA
Oct 31 35° 56° 16° (1949) 86° (1968) 0.1" NA
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