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
May 1 41° 64° 25° (1950) 90° (1959) 0.11" NA
May 2 42° 64° 25° (1967) 91° (1992) 0.11" NA
May 3 42° 64° 22° (1967) 93° (1949) 0.11" NA
May 4 43° 65° 26° (1967) 90° (1959) 0.11" NA
May 5 43° 65° 27° (1954) 89° (1949) 0.11" NA
May 6 43° 66° 26° (1974) 88° (1955) 0.11" NA
May 7 44° 66° 25° (1954) 86° (1970) 0.11" NA
May 8 44° 67° 28° (1960) 88° (1990) 0.11" NA
May 9 45° 67° 30° (1967) 85° (1970) 0.11" NA
May 10 45° 68° 30° (1981) 89° (1985) 0.11" NA
May 11 46° 68° 29° (1960) 86° (2007) 0.12" NA
May 12 46° 68° 29° (1979) 87° (1961) 0.12" NA
May 13 47° 69° 29° (1997) 89° (1949) 0.12" NA
May 14 47° 69° 35° (2004) 89° (1977) 0.12" NA
May 15 47° 70° 30° (1997) 93° (1988) 0.12" NA
May 16 48° 70° 30° (1956) 91° (2001) 0.12" NA
May 17 48° 70° 32° (1968) 89° (1979) 0.12" NA
May 18 49° 71° 35° (2002) 93° (1967) 0.12" NA
May 19 49° 71° 34° (1954) 92° (1972) 0.12" NA
May 20 49° 72° 33° (2002) 97° (1948) 0.12" NA
May 21 50° 72° 35° (1963) 92° (1948) 0.12" NA
May 22 50° 72° 28° (1963) 90° (1956) 0.13" NA
May 23 51° 73° 30° (1963) 91° (1964) 0.13" NA
May 24 51° 73° 33° (1949) 89° (1977) 0.13" NA
May 25 52° 74° 38° (1992) 99° (1967) 0.13" NA
May 26 52° 74° 34° (1961) 91° (1977) 0.13" NA
May 27 52° 74° 37° (1992) 92° (1977) 0.13" NA
May 28 53° 75° 33° (1965) 93° (1980) 0.14" NA
May 29 53° 75° 37° (1952) 92° (1979) 0.14" NA
May 30 53° 75° 40° (1955) 92° (1953) 0.14" NA
May 31 54° 76° 40° (1964) 92° (1994) 0.14" NA
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