Alton, Iowa
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 27° -30° (1972) 68° (2002) 0.75" 7"
February 14° 35° -27° (1994) 68° (1981) 0.7" 5.9"
March 25° 47° -19° (1960) 87° (1968) 2.04" 7.9"
April 36° 63° -1° (1975) 95° (2007) 2.83" 2.1"
May 48° 75° 17° (1967) 104° (1967) 3.49" 0"
June 58° 84° 33° (1989) 105° (1988) 4.59" 0"
July 61° 87° 38° (1972) 103° (1988) 3.79" 0"
August 59° 84° 37° (1986) 101° (1988) 3.42" 0"
September 49° 78° 21° (1984) 102° (1976) 2.59" 0"
October 37° 65° 9° (1972) 92° (2006) 2.16" 1.2"
November 24° 44° -20° (1959) 79° (1999) 1.62" 4.5"
December 11° 31° -29° (1989) 66° (1998) 0.81" 7.2"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 42° 70° 23° (1963) 95° (1987) 0.1" NA
May 2 43° 70° 21° (1967) 94° (1987) 0.1" NA
May 3 43° 71° 17° (1967) 87° (1965) 0.1" NA
May 4 44° 71° 22° (1967) 88° (1962) 0.1" NA
May 5 44° 71° 26° (1954) 90° (2004) 0.1" NA
May 6 45° 72° 27° (1967) 92° (2004) 0.1" NA
May 7 45° 72° 25° (1954) 93° (1990) 0.1" NA
May 8 45° 72° 24° (1954) 92° (1990) 0.1" NA
May 9 46° 73° 26° (1966) 92° (1987) 0.1" NA
May 10 46° 73° 28° (1966) 92° (1987) 0.1" NA
May 11 46° 74° 30° (1960) 89° (2007) 0.1" NA
May 12 47° 74° 28° (1969) 89° (1988) 0.1" NA
May 13 47° 74° 26° (1997) 95° (1987) 0.11" NA
May 14 48° 75° 31° (2004) 95° (2001) 0.11" NA
May 15 48° 75° 26° (1959) 98° (2001) 0.11" NA
May 16 48° 75° 35° (1997) 96° (2001) 0.11" NA
May 17 49° 76° 30° (1973) 94° (1987) 0.11" NA
May 18 49° 76° 32° (1968) 94° (1996) 0.11" NA
May 19 50° 77° 34° (1954) 93° (1996) 0.11" NA
May 20 50° 77° 33° (1967) 92° (1970) 0.12" NA
May 21 50° 77° 33° (1963) 94° (1973) 0.12" NA
May 22 51° 78° 24° (1963) 91° (1970) 0.12" NA
May 23 51° 78° 35° (1963) 93° (2006) 0.12" NA
May 24 51° 78° 35° (1968) 90° (1967) 0.12" NA
May 25 52° 79° 39° (1968) 104° (1967) 0.12" NA
May 26 52° 79° 34° (1961) 102° (1967) 0.13" NA
May 27 52° 79° 34° (1992) 93° (1969) 0.13" NA
May 28 53° 80° 31° (1965) 97° (2006) 0.13" NA
May 29 53° 80° 37° (1983) 97° (1989) 0.13" NA
May 30 53° 80° 40° (1966) 98° (1989) 0.14" NA
May 31 54° 81° 34° (1964) 96° (2002) 0.14" NA
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