Watertown, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 14° 31° -23° (1985) 63° (2002) 1.38" 6.5"
February 19° 35° -28° (1996) 68° (1976) 1.52" 4"
March 29° 48° -14° (1960) 83° (1986) 2.5" 3.8"
April 41° 61° 11° (1982) 88° (1980) 3.24" 0.9"
May 52° 72° 28° (2005) 93° (2006) 4.06" 0"
June 62° 82° 42° (1978) 100° (1988) 4.68" 0"
July 66° 85° 48° (1971) 102° (1995) 4" 0"
August 64° 83° 43° (1986) 103° (1983) 4.41" 0"
September 56° 76° 32° (1984) 97° (1990) 3.12" 0"
October 44° 63° 18° (1952) 91° (2006) 2.66" 0.2"
November 32° 49° -4° (1976) 78° (2000) 2.36" 0.4"
December 19° 34° -21° (1983) 69° (1998) 2.17" 4.3"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
May 1 47° 67° 32° (1950) 87° (1952) 0.12" NA
May 2 47° 68° 30° (1978) 84° (1959) 0.12" NA
May 3 47° 68° 28° (2005) 85° (1949) 0.13" NA
May 4 48° 68° 32° (1954) 88° (1952) 0.13" NA
May 5 48° 69° 34° (1954) 88° (1949) 0.13" NA
May 6 48° 69° 30° (1989) 84° (2004) 0.12" NA
May 7 49° 69° 30° (1989) 85° (1965) 0.12" NA
May 8 49° 70° 35° (1960) 88° (1963) 0.12" NA
May 9 49° 70° 31° (1966) 88° (1963) 0.12" NA
May 10 50° 70° 33° (1984) 85° (1987) 0.13" NA
May 11 50° 71° 36° (1952) 87° (1987) 0.12" NA
May 12 51° 71° 34° (1981) 90° (1956) 0.13" NA
May 13 51° 71° 36° (1953) 88° (1991) 0.13" NA
May 14 51° 72° 38° (1981) 89° (2007) 0.13" NA
May 15 52° 72° 38° (1996) 86° (1977) 0.13" NA
May 16 52° 72° 38° (1956) 87° (1962) 0.13" NA
May 17 52° 73° 40° (1973) 88° (1992) 0.13" NA
May 18 53° 73° 39° (2002) 90° (1964) 0.13" NA
May 19 53° 73° 36° (2002) 90° (1998) 0.13" NA
May 20 53° 74° 39° (1954) 89° (1987) 0.14" NA
May 21 54° 74° 38° (1986) 88° (1987) 0.13" NA
May 22 54° 74° 36° (1963) 89° (1994) 0.15" NA
May 23 54° 75° 41° (1958) 89° (1975) 0.14" NA
May 24 55° 75° 39° (1992) 90° (2010) 0.14" NA
May 25 55° 75° 39° (1992) 94° (2010) 0.14" NA
May 26 55° 76° 39° (1961) 91° (1977) 0.14" NA
May 27 56° 76° 38° (1992) 93° (1978) 0.13" NA
May 28 56° 76° 43° (1971) 92° (1991) 0.14" NA
May 29 56° 77° 39° (1984) 93° (2006) 0.13" NA
May 30 57° 77° 42° (1983) 92° (1953) 0.14" NA
May 31 57° 77° 43° (1983) 91° (1988) 0.14" NA
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