Port Byron, 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
Oct 1 49° 70° 31° (1974) 86° (2002) 0.08" NA
Oct 2 49° 69° 25° (1974) 90° (1953) 0.08" NA
Oct 3 48° 69° 30° (1974) 91° (2006) 0.08" NA
Oct 4 48° 68° 31° (2003) 91° (2006) 0.09" NA
Oct 5 47° 68° 36° (1964) 86° (2007) 0.08" NA
Oct 6 47° 68° 25° (1952) 87° (1963) 0.09" NA
Oct 7 47° 67° 29° (2000) 87° (2007) 0.08" NA
Oct 8 46° 67° 29° (2000) 85° (1949) 0.09" NA
Oct 9 46° 66° 30° (2000) 80° (1949) 0.08" NA
Oct 10 46° 66° 29° (1964) 83° (1962) 0.09" NA
Oct 11 45° 65° 27° (1987) 83° (1962) 0.08" NA
Oct 12 45° 65° 30° (1988) 82° (1956) 0.09" NA
Oct 13 45° 65° 30° (1979) 83° (1975) 0.08" NA
Oct 14 44° 64° 31° (1983) 82° (1968) 0.09" NA
Oct 15 44° 64° 29° (1991) 85° (1953) 0.08" NA
Oct 16 44° 64° 29° (1976) 83° (1950) 0.09" NA
Oct 17 43° 63° 28° (1976) 83° (1956) 0.08" NA
Oct 18 43° 63° 26° (1972) 83° (1950) 0.09" NA
Oct 19 43° 62° 24° (1972) 80° (1971) 0.09" NA
Oct 20 42° 62° 24° (1952) 84° (1953) 0.09" NA
Oct 21 42° 61° 28° (1952) 80° (1953) 0.08" NA
Oct 22 42° 61° 26° (1976) 80° (1963) 0.09" NA
Oct 23 41° 61° 25° (1981) 82° (1963) 0.09" NA
Oct 24 41° 60° 25° (1981) 80° (1963) 0.09" NA
Oct 25 41° 60° 24° (2006) 77° (1963) 0.08" NA
Oct 26 40° 59° 26° (1962) 82° (1963) 0.09" NA
Oct 27 40° 59° 25° (1969) 77° (1974) 0.09" NA
Oct 28 40° 58° 25° (1969) 76° (1948) 0.08" NA
Oct 29 39° 58° 18° (1952) 78° (2004) 0.09" NA
Oct 30 39° 58° 20° (1988) 79° (1971) 0.09" NA
Oct 31 39° 57° 24° (1949) 80° (1950) 0.09" NA
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