Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 10° 26° -27° (1999) 65° (2004) 1.6" 9"
February 15° 32° -27° (1905) 71° (2000) 1.43" 6.8"
March 27° 44° -13° (2002) 87° (1986) 2.55" 5"
April 37° 58° 8° (1982) 93° (1986) 3.61" 1.3"
May 48° 70° 24° (2005) 105° (1934) 4.32" 0"
June 58° 79° 34° (1945) 106° (1934) 4.88" 0"
July 62° 82° 43° (1904) 110° (1936) 3.45" 0"
August 60° 80° 37° (1934) 103° (1988) 4.47" 0"
September 51° 73° 22° (1942) 102° (1939) 3.31" 0"
October 39° 62° 7° (1925) 93° (1963) 2.71" 0.2"
November 28° 45° -8° (1977) 81° (1933) 2.82" 1.5"
December 17° 31° -25° (1983) 68° (1998) 2.13" 9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Apr 1 32° 52° 14° (1924) 85° (1986) 0.1" NA
Apr 2 33° 52° 18° (1926) 83° (2003) 0.11" NA
Apr 3 33° 53° 16° (1954) 80° (1921) 0.11" NA
Apr 4 33° 53° 17° (1936) 82° (1929) 0.11" NA
Apr 5 34° 53° 11° (1975) 82° (1929) 0.11" NA
Apr 6 34° 54° 11° (1982) 83° (1929) 0.11" NA
Apr 7 34° 54° 8° (1982) 84° (1991) 0.11" NA
Apr 8 35° 55° 13° (1982) 83° (1931) 0.11" NA
Apr 9 35° 55° 15° (1997) 83° (1931) 0.12" NA
Apr 10 35° 56° 19° (1909) 92° (1930) 0.12" NA
Apr 11 36° 56° 22° (1973) 91° (1930) 0.12" NA
Apr 12 36° 57° 18° (1939) 89° (1930) 0.12" NA
Apr 13 36° 57° 18° (1939) 83° (1977) 0.12" NA
Apr 14 37° 57° 16° (1904) 85° (2006) 0.12" NA
Apr 15 37° 58° 19° (1928) 86° (2003) 0.12" NA
Apr 16 38° 58° 18° (1949) 88° (2002) 0.12" NA
Apr 17 38° 59° 15° (1904) 88° (1977) 0.12" NA
Apr 18 38° 59° 23° (1926) 87° (1977) 0.12" NA
Apr 19 39° 60° 19° (1983) 91° (2002) 0.12" NA
Apr 20 39° 60° 16° (1904) 86° (1985) 0.12" NA
Apr 21 39° 60° 13° (1904) 90° (1987) 0.13" NA
Apr 22 40° 61° 22° (1986) 88° (1985) 0.13" NA
Apr 23 40° 61° 23° (1910) 90° (1980) 0.13" NA
Apr 24 40° 62° 18° (1910) 87° (1915) 0.13" NA
Apr 25 41° 62° 21° (1934) 86° (1915) 0.13" NA
Apr 26 41° 62° 26° (1907) 93° (1986) 0.13" NA
Apr 27 42° 63° 25° (1946) 90° (1986) 0.13" NA
Apr 28 42° 63° 26° (1950) 89° (1952) 0.13" NA
Apr 29 42° 64° 27° (1958) 91° (1970) 0.13" NA
Apr 30 43° 64° 28° (1907) 91° (1942) 0.13" NA
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