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
Aug 1 62° 82° 49° (1925) 98° (1945) 0.12" NA
Aug 2 62° 82° 48° (1927) 101° (1988) 0.13" NA
Aug 3 62° 82° 42° (1912) 103° (1930) 0.13" NA
Aug 4 62° 82° 45° (1912) 101° (1930) 0.13" NA
Aug 5 62° 82° 46° (1910) 98° (1918) 0.14" NA
Aug 6 62° 82° 46° (1910) 100° (1947) 0.14" NA
Aug 7 62° 82° 46° (1903) 97° (1937) 0.14" NA
Aug 8 62° 81° 45° (1904) 100° (1930) 0.14" NA
Aug 9 61° 81° 45° (1927) 101° (1934) 0.14" NA
Aug 10 61° 81° 48° (1982) 99° (1936) 0.15" NA
Aug 11 61° 81° 44° (1982) 99° (1941) 0.15" NA
Aug 12 61° 81° 43° (1903) 96° (1918) 0.15" NA
Aug 13 61° 81° 47° (1931) 97° (1944) 0.15" NA
Aug 14 61° 81° 43° (1904) 100° (1944) 0.15" NA
Aug 15 61° 81° 46° (1929) 98° (1988) 0.15" NA
Aug 16 61° 80° 46° (1992) 101° (1937) 0.15" NA
Aug 17 60° 80° 48° (1924) 103° (1988) 0.15" NA
Aug 18 60° 80° 44° (1963) 103° (1936) 0.15" NA
Aug 19 60° 80° 47° (1932) 103° (1936) 0.15" NA
Aug 20 59° 80° 40° (1950) 98° (1947) 0.15" NA
Aug 21 59° 80° 41° (1950) 102° (1983) 0.15" NA
Aug 22 59° 80° 43° (1923) 100° (1947) 0.15" NA
Aug 23 59° 79° 45° (1920) 101° (1947) 0.15" NA
Aug 24 59° 79° 40° (1942) 100° (1947) 0.15" NA
Aug 25 58° 79° 40° (1934) 97° (1909) 0.15" NA
Aug 26 58° 79° 41° (1934) 96° (2003) 0.15" NA
Aug 27 58° 79° 44° (1915) 96° (1973) 0.15" NA
Aug 28 57° 78° 40° (1915) 97° (1976) 0.14" NA
Aug 29 57° 78° 37° (1934) 99° (1983) 0.14" NA
Aug 30 57° 78° 40° (1915) 99° (1984) 0.14" NA
Aug 31 57° 78° 39° (1915) 98° (1953) 0.14" NA
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