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
Sep 1 56° 77° 39° (1949) 98° (1953) 0.14" NA
Sep 2 56° 77° 38° (1946) 98° (1953) 0.13" NA
Sep 3 56° 77° 43° (1908) 98° (1913) 0.13" NA
Sep 4 55° 77° 39° (1974) 100° (1925) 0.13" NA
Sep 5 55° 76° 42° (1935) 98° (1922) 0.13" NA
Sep 6 55° 76° 39° (1988) 100° (1922) 0.13" NA
Sep 7 54° 76° 38° (1956) 102° (1939) 0.12" NA
Sep 8 54° 76° 39° (1949) 98° (1922) 0.12" NA
Sep 9 54° 75° 40° (1924) 99° (1933) 0.12" NA
Sep 10 53° 75° 38° (1924) 95° (1978) 0.12" NA
Sep 11 53° 75° 36° (1917) 96° (1978) 0.12" NA
Sep 12 53° 75° 37° (1955) 96° (1939) 0.11" NA
Sep 13 52° 74° 35° (1953) 98° (1939) 0.11" NA
Sep 14 52° 74° 31° (1923) 100° (1939) 0.11" NA
Sep 15 52° 74° 34° (2007) 102° (1939) 0.11" NA
Sep 16 51° 73° 33° (1916) 93° (1931) 0.11" NA
Sep 17 51° 73° 32° (1937) 93° (1906) 0.11" NA
Sep 18 50° 73° 33° (1916) 93° (1988) 0.1" NA
Sep 19 50° 72° 33° (1901) 93° (1947) 0.1" NA
Sep 20 50° 72° 30° (1956) 92° (1920) 0.1" NA
Sep 21 49° 72° 33° (1991) 93° (1920) 0.1" NA
Sep 22 49° 71° 32° (1974) 93° (1937) 0.1" NA
Sep 23 48° 71° 29° (1995) 93° (1937) 0.1" NA
Sep 24 48° 71° 31° (1950) 92° (1920) 0.1" NA
Sep 25 48° 70° 27° (1942) 95° (1920) 0.1" NA
Sep 26 47° 70° 28° (1926) 96° (1935) 0.1" NA
Sep 27 47° 70° 28° (1937) 89° (1998) 0.09" NA
Sep 28 46° 69° 22° (1942) 93° (1905) 0.09" NA
Sep 29 46° 69° 28° (1949) 95° (1953) 0.09" NA
Sep 30 46° 69° 28° (1984) 92° (1971) 0.09" NA
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