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
Dec 1 22° 40° 3° (1985) 65° (1970) 0.07" NA
Dec 2 22° 40° 0° (1985) 64° (1962) 0.07" NA
Dec 3 21° 39° 1° (1985) 66° (1962) 0.07" NA
Dec 4 21° 39° 2° (1991) 66° (1998) 0.06" NA
Dec 5 20° 38° 3° (1964) 66° (1998) 0.06" NA
Dec 6 20° 38° -3° (1972) 66° (2001) 0.06" NA
Dec 7 20° 37° -6° (1976) 60° (1991) 0.06" NA
Dec 8 19° 37° -8° (1976) 56° (1984) 0.06" NA
Dec 9 19° 37° -4° (1995) 58° (1990) 0.06" NA
Dec 10 19° 36° -5° (1995) 60° (1979) 0.06" NA
Dec 11 18° 36° -5° (1962) 65° (1965) 0.05" NA
Dec 12 18° 36° -10° (1962) 62° (1968) 0.05" NA
Dec 13 18° 35° -9° (2000) 61° (1975) 0.05" NA
Dec 14 18° 35° -10° (1989) 58° (1975) 0.05" NA
Dec 15 17° 35° -15° (1989) 60° (2006) 0.05" NA
Dec 16 17° 34° -6° (1963) 61° (2002) 0.05" NA
Dec 17 17° 34° -7° (1964) 60° (2006) 0.05" NA
Dec 18 16° 34° -16° (1983) 61° (1976) 0.04" NA
Dec 19 16° 34° -17° (1983) 58° (1966) 0.04" NA
Dec 20 16° 33° -13° (1983) 55° (1967) 0.04" NA
Dec 21 15° 33° -19° (1989) 55° (1967) 0.04" NA
Dec 22 15° 33° -21° (1989) 56° (1979) 0.04" NA
Dec 23 15° 33° -22° (1989) 64° (1964) 0.04" NA
Dec 24 15° 32° -19° (1983) 57° (1982) 0.04" NA
Dec 25 14° 32° -15° (1983) 53° (1982) 0.04" NA
Dec 26 14° 32° -13° (1962) 48° (1994) 0.04" NA
Dec 27 14° 32° -1° (2000) 63° (1976) 0.04" NA
Dec 28 14° 32° -1° (2000) 68° (1984) 0.04" NA
Dec 29 14° 31° -7° (1983) 65° (1984) 0.04" NA
Dec 30 13° 31° -13° (1968) 62° (1965) 0.03" NA
Dec 31 13° 31° -14° (1968) 64° (2004) 0.03" NA
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