Monticello, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 28° -30° (1999) 66° (1989) 1.29" 8.2"
February 14° 33° -37° (1996) 67° (2000) 1.42" 3.8"
March 25° 46° -22° (1962) 87° (1986) 2.18" 2.9"
April 35° 61° 0° (1982) 90° (1987) 3.65" 0.9"
May 46° 71° 22° (2005) 93° (1985) 4.3" 0"
June 56° 81° 33° (1993) 100° (1988) 4.87" 0"
July 60° 84° 39° (1972) 102° (1988) 4.91" 0"
August 58° 82° 37° (1986) 102° (1987) 4.73" 0"
September 49° 75° 23° (1984) 99° (1955) 3.41" 0"
October 37° 62° 10° (1952) 93° (1997) 2.93" 0.1"
November 27° 46° -14° (1977) 78° (2000) 2.49" 0.9"
December 14° 32° -27° (2000) 71° (1998) 1.72" 5.2"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Dec 1 19° 37° -3° (1971) 60° (1962) 0.07" 0.2"
Dec 2 19° 37° -3° (1976) 64° (1962) 0.07" 0.1"
Dec 3 18° 36° -13° (1985) 65° (1951) 0.07" 0.1"
Dec 4 18° 36° -5° (1991) 71° (1998) 0.06" 0.2"
Dec 5 17° 35° -11° (2005) 65° (2001) 0.07" 0.1"
Dec 6 17° 35° -10° (1977) 68° (2001) 0.06" 0.1"
Dec 7 16° 34° -17° (1976) 53° (1951) 0.07" 0.2"
Dec 8 16° 34° -17° (2005) 51° (1984) 0.06" 0.2"
Dec 9 16° 33° -19° (1958) 52° (1993) 0.06" 0.1"
Dec 10 15° 33° -18° (1958) 54° (1979) 0.06" 0.2"
Dec 11 15° 33° -16° (1977) 64° (1949) 0.07" 0.1"
Dec 12 15° 32° -16° (2000) 59° (1949) 0.05" 0.2"
Dec 13 14° 32° -16° (2000) 52° (1968) 0.06" 0.1"
Dec 14 14° 32° -15° (1985) 52° (1998) 0.06" 0.2"
Dec 15 14° 31° -16° (1989) 56° (2006) 0.05" 0.2"
Dec 16 13° 31° -18° (1963) 55° (1984) 0.06" 0.2"
Dec 17 13° 31° -18° (1953) 54° (2006) 0.05" 0.1"
Dec 18 13° 30° -16° (1983) 56° (2002) 0.05" 0.2"
Dec 19 13° 30° -27° (1985) 52° (1988) 0.05" 0.2"
Dec 20 12° 30° -18° (1963) 52° (1967) 0.05" 0.2"
Dec 21 12° 30° -27° (1963) 57° (1967) 0.05" 0.2"
Dec 22 12° 29° -26° (1963) 55° (1957) 0.05" 0.1"
Dec 23 12° 29° -27° (1989) 55° (1965) 0.05" 0.2"
Dec 24 12° 29° -27° (2000) 57° (1982) 0.05" 0.2"
Dec 25 11° 29° -14° (1983) 54° (1982) 0.04" 0.2"
Dec 26 11° 29° -25° (1962) 48° (1994) 0.05" 0.1"
Dec 27 11° 29° -27° (1950) 58° (1958) 0.05" 0.2"
Dec 28 11° 28° -15° (1961) 65° (1984) 0.04" 0.3"
Dec 29 11° 28° -11° (1963) 65° (1984) 0.05" 0.1"
Dec 30 11° 28° -18° (1963) 55° (1965) 0.05" 0.2"
Dec 31 10° 28° -19° (1976) 60° (1965) 0.04" 0.2"
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