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
Jan 1 13° 31° -11° (1979) 52° (2000) 0.04" NA
Jan 2 13° 31° -13° (1979) 58° (1964) 0.03" NA
Jan 3 13° 31° -9° (1979) 60° (2004) 0.03" NA
Jan 4 12° 31° -10° (1969) 57° (1997) 0.03" NA
Jan 5 12° 31° -15° (1999) 57° (2007) 0.03" NA
Jan 6 12° 31° -12° (1971) 48° (1983) 0.03" NA
Jan 7 12° 31° -16° (1968) 52° (1949) 0.03" NA
Jan 8 12° 30° -13° (1970) 56° (2003) 0.03" NA
Jan 9 12° 30° -16° (1977) 66° (2003) 0.03" NA
Jan 10 12° 30° -22° (1982) 54° (1990) 0.03" NA
Jan 11 12° 30° -14° (1977) 53° (1980) 0.03" NA
Jan 12 11° 30° -8° (1963) 53° (2006) 0.03" NA
Jan 13 11° 30° -10° (1963) 62° (1996) 0.03" NA
Jan 14 11° 30° -15° (1979) 51° (1980) 0.03" NA
Jan 15 11° 30° -15° (1979) 57° (1990) 0.03" NA
Jan 16 11° 30° -20° (1977) 63° (1990) 0.03" NA
Jan 17 11° 31° -16° (1977) 61° (1996) 0.03" NA
Jan 18 11° 31° -13° (1994) 55° (1972) 0.03" NA
Jan 19 11° 31° -17° (1985) 54° (1989) 0.03" NA
Jan 20 11° 31° -19° (1985) 53° (2006) 0.03" NA
Jan 21 12° 31° -18° (1970) 58° (1964) 0.03" NA
Jan 22 12° 31° -10° (1963) 62° (1964) 0.03" NA
Jan 23 12° 31° -18° (1963) 60° (1976) 0.03" NA
Jan 24 12° 31° -11° (2003) 62° (1981) 0.03" NA
Jan 25 12° 31° -8° (1978) 58° (1981) 0.04" NA
Jan 26 12° 32° -6° (1950) 65° (2002) 0.04" NA
Jan 27 12° 32° -12° (1963) 64° (2002) 0.04" NA
Jan 28 12° 32° -14° (1977) 63° (2002) 0.04" NA
Jan 29 13° 32° -18° (1966) 59° (1988) 0.04" NA
Jan 30 13° 32° -13° (1949) 60° (1988) 0.04" NA
Jan 31 13° 32° -16° (1996) 70° (1989) 0.04" NA
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