Jefferson, Wisconsin
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 28° -33° (1951) 58° (2002) 1.3" 9.8"
February 15° 32° -39° (1996) 67° (1999) 1.41" 8"
March 25° 44° -21° (1962) 83° (1986) 1.96" 4.3"
April 37° 58° -4° (1979) 90° (2002) 3.51" 1.1"
May 47° 69° 25° (1966) 93° (1978) 3.75" 0.2"
June 57° 79° 35° (2003) 101° (1988) 4.2" 0"
July 62° 83° 39° (1965) 102° (1988) 3.86" 0"
August 59° 81° 37° (1986) 102° (1988) 3.95" 0"
September 50° 73° 28° (1991) 98° (1955) 3.38" 0"
October 39° 61° 11° (1988) 88° (2007) 2.74" 0.1"
November 29° 46° -10° (1950) 78° (1999) 2.45" 1.8"
December 16° 32° -29° (1983) 67° (2001) 1.7" 9.6"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 42° 64° 26° (1961) 88° (1952) 0.12" 0"
May 2 43° 65° 27° (1966) 87° (1959) 0.11" 0"
May 3 43° 65° 26° (2004) 86° (1949) 0.13" 0"
May 4 43° 65° 28° (1954) 90° (1952) 0.12" 0"
May 5 44° 66° 31° (1968) 89° (1959) 0.12" 0.1"
May 6 44° 66° 28° (1970) 87° (1959) 0.12" 0"
May 7 44° 66° 27° (1989) 85° (1965) 0.12" 0"
May 8 45° 67° 30° (1989) 85° (1963) 0.12" 0"
May 9 45° 67° 25° (1966) 87° (1979) 0.11" 0"
May 10 45° 67° 25° (1966) 88° (1979) 0.12" 0"
May 11 46° 68° 27° (1981) 88° (1979) 0.11" 0"
May 12 46° 68° 30° (1960) 84° (1992) 0.12" 0"
May 13 46° 68° 32° (1953) 86° (1961) 0.12" 0"
May 14 46° 69° 32° (1964) 87° (1991) 0.12" 0.1"
May 15 47° 69° 33° (1984) 89° (2007) 0.12" 0"
May 16 47° 69° 31° (1957) 88° (1962) 0.12" 0"
May 17 47° 70° 34° (1973) 90° (1977) 0.12" 0"
May 18 48° 70° 30° (2002) 90° (1962) 0.12" 0"
May 19 48° 70° 28° (1981) 90° (1977) 0.12" 0"
May 20 48° 71° 34° (1954) 92° (1977) 0.13" 0"
May 21 49° 71° 27° (1997) 91° (1977) 0.12" 0"
May 22 49° 71° 32° (1961) 89° (1956) 0.13" 0"
May 23 49° 72° 29° (1958) 87° (1972) 0.12" 0"
May 24 50° 72° 35° (1956) 91° (2010) 0.13" 0"
May 25 50° 72° 31° (1988) 94° (2010) 0.12" 0"
May 26 50° 73° 33° (1961) 90° (1967) 0.13" 0"
May 27 51° 73° 31° (1992) 91° (1978) 0.12" 0"
May 28 51° 73° 33° (1949) 93° (1978) 0.12" 0"
May 29 51° 74° 32° (1984) 92° (2006) 0.12" 0"
May 30 52° 74° 34° (1996) 92° (1991) 0.12" 0"
May 31 52° 74° 35° (1966) 91° (2010) 0.13" 0"
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