Duncan, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 22° -31° (1970) 62° (2002) 0.93" NA
February 10° 28° -30° (1996) 63° (1981) 0.91" NA
March 23° 41° -25° (1962) 83° (1968) 1.94" NA
April 35° 56° 5° (1975) 94° (1980) 3.18" NA
May 48° 70° 22° (1967) 99° (1967) 3.76" NA
June 58° 80° 35° (1978) 104° (1985) 4.71" NA
July 61° 82° 41° (1950) 106° (1948) 4.27" NA
August 59° 79° 30° (1950) 101° (1988) 3.87" NA
September 49° 72° 22° (1984) 100° (1960) 2.98" NA
October 37° 59° 11° (1949) 93° (1997) 2.1" NA
November 24° 40° -16° (1977) 79° (2006) 1.85" NA
December 26° -27° (1990) 67° (1998) 1.04" NA
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Apr 1 29° 49° 12° (1975) 80° (1982) 0.09" NA
Apr 2 29° 49° 15° (1970) 84° (1981) 0.09" NA
Apr 3 30° 50° 5° (1975) 79° (2003) 0.09" NA
Apr 4 30° 50° 9° (1995) 72° (1948) 0.1" NA
Apr 5 30° 51° 9° (1995) 80° (2005) 0.1" NA
Apr 6 31° 51° 9° (1979) 84° (1991) 0.1" NA
Apr 7 31° 52° 11° (1990) 89° (1991) 0.1" NA
Apr 8 31° 52° 11° (1997) 82° (1991) 0.1" NA
Apr 9 32° 53° 9° (1997) 87° (1977) 0.1" NA
Apr 10 32° 53° 13° (1997) 84° (1977) 0.1" NA
Apr 11 33° 54° 19° (1973) 85° (1968) 0.11" NA
Apr 12 33° 55° 15° (1950) 82° (1985) 0.11" NA
Apr 13 33° 55° 12° (1962) 83° (1985) 0.11" NA
Apr 14 34° 56° 13° (1950) 87° (2006) 0.11" NA
Apr 15 34° 56° 20° (1962) 87° (2003) 0.11" NA
Apr 16 35° 56° 20° (1949) 89° (2002) 0.11" NA
Apr 17 35° 57° 19° (1990) 86° (2004) 0.11" NA
Apr 18 35° 57° 16° (1953) 91° (1985) 0.11" NA
Apr 19 36° 58° 22° (1988) 92° (1985) 0.11" NA
Apr 20 36° 58° 25° (1950) 87° (1985) 0.11" NA
Apr 21 37° 59° 21° (1950) 92° (1980) 0.11" NA
Apr 22 37° 59° 24° (1986) 94° (1980) 0.11" NA
Apr 23 37° 60° 20° (1956) 85° (1960) 0.11" NA
Apr 24 38° 60° 20° (1967) 84° (1990) 0.11" NA
Apr 25 38° 61° 26° (1968) 90° (1949) 0.11" NA
Apr 26 39° 61° 24° (2002) 84° (1962) 0.11" NA
Apr 27 39° 62° 25° (1950) 90° (1977) 0.12" NA
Apr 28 40° 62° 21° (1950) 91° (1970) 0.11" NA
Apr 29 40° 63° 22° (1958) 90° (1970) 0.11" NA
Apr 30 41° 63° 26° (1956) 92° (1965) 0.11" NA
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