Sterling/Rock Falls, Illinois
Monthly Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
January 12° 29° -27° (1999) 65° (2004) 1.57" 11.2"
February 16° 34° -27° (1905) 71° (2000) 1.65" 5.8"
March 27° 46° -13° (2002) 87° (1986) 2.47" 4.1"
April 38° 60° 8° (1982) 93° (1986) 3.5" 0.7"
May 49° 71° 24° (2005) 105° (1934) 4.41" 0"
June 59° 79° 34° (1945) 106° (1934) 4.9" 0"
July 63° 83° 43° (1904) 110° (1936) 4.14" 0"
August 61° 81° 37° (1934) 103° (1988) 4.5" 0"
September 51° 75° 22° (1942) 102° (1939) 3.55" 0"
October 40° 62° 7° (1925) 93° (1963) 2.9" 0.1"
November 29° 47° -8° (1977) 81° (1933) 2.69" 1.4"
December 17° 33° -25° (1983) 68° (1998) 2.19" 6.9"
Daily Averages & Records -  °F | °C
Date Average
Low
Average
High
Record
Low
Record
High
Average
Precipitation
Average
Snow
Sep 1 58° 79° 39° (1949) 98° (1953) 0.13" 0"
Sep 2 57° 79° 38° (1946) 98° (1953) 0.14" 0"
Sep 3 57° 79° 43° (1908) 98° (1913) 0.13" 0"
Sep 4 57° 79° 39° (1974) 100° (1925) 0.12" 0"
Sep 5 56° 78° 42° (1935) 98° (1922) 0.13" 0"
Sep 6 56° 78° 39° (1988) 100° (1922) 0.12" 0"
Sep 7 55° 78° 38° (1956) 102° (1939) 0.12" 0"
Sep 8 55° 77° 39° (1949) 98° (1922) 0.13" 0"
Sep 9 55° 77° 40° (1924) 99° (1933) 0.12" 0"
Sep 10 54° 77° 38° (1924) 95° (1978) 0.12" 0"
Sep 11 54° 76° 36° (1917) 96° (1978) 0.11" 0"
Sep 12 53° 76° 37° (1955) 96° (1939) 0.11" 0"
Sep 13 53° 76° 35° (1953) 98° (1939) 0.12" 0"
Sep 14 52° 75° 31° (1923) 100° (1939) 0.12" 0"
Sep 15 52° 75° 34° (2007) 102° (1939) 0.12" 0"
Sep 16 51° 75° 33° (1916) 93° (1931) 0.11" 0"
Sep 17 51° 74° 32° (1937) 93° (1906) 0.11" 0"
Sep 18 50° 74° 33° (1916) 93° (1988) 0.12" 0"
Sep 19 50° 73° 33° (1901) 93° (1947) 0.12" 0"
Sep 20 49° 73° 30° (1956) 92° (1920) 0.12" 0"
Sep 21 49° 73° 33° (1991) 93° (1920) 0.12" 0"
Sep 22 48° 72° 32° (1974) 93° (1937) 0.12" 0"
Sep 23 48° 72° 29° (1995) 93° (1937) 0.12" 0"
Sep 24 47° 71° 31° (1950) 92° (1920) 0.12" 0"
Sep 25 47° 71° 27° (1942) 95° (1920) 0.11" 0"
Sep 26 46° 70° 28° (1926) 96° (1935) 0.11" 0"
Sep 27 46° 70° 28° (1937) 89° (1998) 0.12" 0"
Sep 28 46° 70° 22° (1942) 93° (1905) 0.11" 0"
Sep 29 45° 69° 28° (1949) 95° (1953) 0.1" 0"
Sep 30 45° 69° 28° (1984) 92° (1971) 0.1" 0"
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