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
Jun 1 54° 76° 38° (1950) 90° (1988) 0.14" NA
Jun 2 55° 76° 39° (1969) 90° (1948) 0.15" NA
Jun 3 55° 77° 35° (1969) 92° (1948) 0.15" NA
Jun 4 55° 77° 37° (1951) 97° (1977) 0.15" NA
Jun 5 56° 77° 44° (1993) 98° (1977) 0.15" NA
Jun 6 56° 78° 42° (1953) 98° (1968) 0.15" NA
Jun 7 56° 78° 43° (1949) 93° (1963) 0.15" NA
Jun 8 57° 78° 35° (1978) 94° (1985) 0.16" NA
Jun 9 57° 79° 42° (1955) 104° (1985) 0.16" NA
Jun 10 57° 79° 44° (1989) 94° (1956) 0.16" NA
Jun 11 57° 79° 42° (1958) 92° (1956) 0.16" NA
Jun 12 58° 79° 45° (1955) 95° (1952) 0.16" NA
Jun 13 58° 80° 40° (1969) 96° (1956) 0.16" NA
Jun 14 58° 80° 44° (1958) 94° (1988) 0.16" NA
Jun 15 58° 80° 40° (1989) 93° (1959) 0.16" NA
Jun 16 59° 80° 44° (1989) 95° (1959) 0.16" NA
Jun 17 59° 80° 44° (1960) 90° (1949) 0.16" NA
Jun 18 59° 81° 46° (1950) 99° (1953) 0.16" NA
Jun 19 59° 81° 45° (1950) 99° (1953) 0.16" NA
Jun 20 59° 81° 42° (1969) 97° (1988) 0.16" NA
Jun 21 60° 81° 41° (1992) 97° (1988) 0.16" NA
Jun 22 60° 81° 42° (1982) 100° (1988) 0.16" NA
Jun 23 60° 81° 45° (1958) 93° (1995) 0.16" NA
Jun 24 60° 81° 44° (1979) 95° (1977) 0.16" NA
Jun 25 60° 81° 42° (1958) 96° (1988) 0.16" NA
Jun 26 60° 82° 47° (1968) 100° (1980) 0.16" NA
Jun 27 61° 82° 42° (1950) 99° (1980) 0.16" NA
Jun 28 61° 82° 50° (1951) 95° (1980) 0.16" NA
Jun 29 61° 82° 41° (1950) 97° (1970) 0.16" NA
Jun 30 61° 82° 48° (1950) 97° (1961) 0.15" NA
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