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
Dec 1 16° 31° -8° (1976) 62° (1962) 0.05" NA
Dec 2 15° 31° -8° (1976) 67° (1998) 0.04" NA
Dec 3 15° 30° -16° (1985) 62° (1998) 0.04" NA
Dec 4 14° 30° -9° (1991) 58° (1962) 0.04" NA
Dec 5 14° 30° -5° (1992) 59° (2001) 0.04" NA
Dec 6 13° 29° -18° (1972) 60° (2001) 0.04" NA
Dec 7 13° 29° -18° (1976) 49° (1951) 0.04" NA
Dec 8 12° 28° -15° (1976) 49° (1970) 0.04" NA
Dec 9 12° 28° -21° (1958) 50° (1979) 0.04" NA
Dec 10 11° 28° -17° (1958) 56° (1979) 0.04" NA
Dec 11 11° 27° -8° (1962) 56° (1965) 0.03" NA
Dec 12 11° 27° -14° (1962) 60° (1968) 0.03" NA
Dec 13 10° 26° -21° (1985) 50° (1998) 0.03" NA
Dec 14 10° 26° -23° (1985) 53° (1998) 0.03" NA
Dec 15 26° -17° (1951) 54° (1998) 0.03" NA
Dec 16 25° -19° (1951) 53° (1959) 0.03" NA
Dec 17 25° -14° (1964) 56° (1980) 0.03" NA
Dec 18 25° -17° (1985) 53° (1962) 0.03" NA
Dec 19 24° -20° (1955) 50° (1976) 0.03" NA
Dec 20 24° -17° (1985) 50° (1967) 0.03" NA
Dec 21 24° -24° (1989) 51° (1967) 0.03" NA
Dec 22 24° -24° (1989) 45° (1957) 0.03" NA
Dec 23 23° -27° (1990) 45° (1965) 0.03" NA
Dec 24 23° -16° (1990) 42° (1953) 0.03" NA
Dec 25 23° -20° (2000) 45° (1954) 0.03" NA
Dec 26 23° -22° (1990) 50° (1959) 0.03" NA
Dec 27 23° -22° (1951) 50° (1959) 0.03" NA
Dec 28 22° -20° (1993) 51° (1984) 0.03" NA
Dec 29 22° -15° (1993) 53° (2002) 0.03" NA
Dec 30 22° -18° (1976) 54° (1965) 0.03" NA
Dec 31 22° -21° (1968) 54° (1965) 0.03" NA
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