Every 1 September to 9 October in Rockford, IL from 1893 to 2026, ranked: the mean temperature, the mean high and the mean low from the warmest, the precipitation from the wettest; a year missing more than a tenth of its days is not ranked.
| Year | Mean, °F | Rank | High, °F | Rank | Low, °F | Rank | Precipitation, in | Rank | Days missing |
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| 2026 | 65.8 | 19 | 76.1 | 34 | 55.5 | 10 | 8.81 | 10 | 0 |
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| 2025 | 66.3 | 13 | 79.4 | 8 | 53.2 | 29 | 1.34 | 110 | 0 |
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| 2024 | 65.2 | 26 | 79.2 | 9 | 51.3 | 58 | 2.05 | 99 | 0 |
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| 2023 | 65.3 | 25 | 76 | 36 | 54.6 | 16 | 2.25 | 93 | 0 |
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| 2022 | 62 | 65 | 73.7 | 61 | 50.4 | 74 | 5.84 | 35 | 0 |
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| 2021 | 69 | 1 | 81.4 | 2 | 56.6 | 6 | 2.49 | 89 | 0 |
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| 2020 | 61.2 | 77 | 72.1 | 89 | 50.4 | 74 | 6.71 | 29 | 0 |
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| 2019 | 66.3 | 13 | 74.9 | 45 | 57.6 | 1 | 10.81 | 3 | 0 |
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| 2018 | 65.5 | 23 | 75.5 | 42 | 55.5 | 10 | 9.28 | 9 | 0 |
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| 2017 | 66.1 | 16 | 78.4 | 11 | 53.7 | 25 | 0.74 | 121 | 0 |
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| 2016 | 67.4 | 7 | 77.2 | 19 | 57.6 | 1 | 3.19 | 76 | 0 |
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| 2015 | 66.4 | 12 | 76.3 | 28 | 56.5 | 7 | 3.29 | 75 | 0 |
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| 2014 | 60.4 | 92 | 71.6 | 95 | 49.3 | 84 | 2.83 | 81 | 0 |
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| 2013 | 65.8 | 19 | 77.5 | 17 | 54 | 22 | 2.86 | 80 | 0 |
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| 2012 | 60.2 | 99 | 73.2 | 68 | 47.1 | 111 | 1.90 | 103 | 0 |
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| 2011 | 61.3 | 75 | 72.2 | 88 | 50.3 | 78 | 5.33 | 40 | 0 |
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| 2010 | 62.9 | 52 | 74.9 | 45 | 50.9 | 63 | 2.04 | 100 | 0 |
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| 2009 | 60.6 | 90 | 70.7 | 110 | 50.5 | 68 | 3.63 | 68 | 0 |
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| 2008 | 63.1 | 49 | 73.3 | 66 | 52.9 | 32 | 6.89 | 26 | 0 |
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| 2007 | 67.6 | 5 | 80.4 | 6 | 54.7 | 14 | 2.16 | 96 | 0 |
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| 2006 | 60.7 | 88 | 71.5 | 96 | 49.9 | 82 | 3.65 | 67 | 0 |
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| 2005 | 66.8 | 8 | 78.3 | 12 | 55.3 | 12 | 1.87 | 104 | 0 |
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| 2004 | 62.5 | 57 | 75.8 | 39 | 49.1 | 89 | 1.21 | 111 | 0 |
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| 2003 | 60.3 | 96 | 73 | 71 | 47.7 | 105 | 2.11 | 98 | 0 |
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| 2002 | 64.2 | 36 | 75.8 | 39 | 52.6 | 37 | 4.04 | 55 | 0 |
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| 2001 | 59.3 | 112 | 70.2 | 114 | 48.5 | 96 | 9.65 | 7 | 0 |
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| 2000 | 60.4 | 92 | 71.5 | 96 | 49.3 | 84 | 8.63 | 14 | 0 |
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| 1999 | 58.7 | 117 | 71.8 | 92 | 45.7 | 120 | 5.87 | 34 | 0 |
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| 1998 | 63.4 | 47 | 74.4 | 54 | 52.5 | 41 | 4.16 | 52 | 0 |
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| 1997 | 63.8 | 41 | 75.9 | 37 | 51.7 | 53 | 2.04 | 100 | 0 |
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| 1996 | 60 | 104 | 71.1 | 103 | 49 | 91 | 1.69 | 107 | 0 |
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| 1995 | 59.3 | 112 | 70.6 | 111 | 48 | 101 | 3.91 | 60 | 0 |
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| 1994 | 62 | 65 | 72 | 90 | 52.1 | 50 | 4.43 | 50 | 0 |
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| 1993 | 57.3 | 122 | 67.8 | 124 | 46.9 | 113 | 4.21 | 51 | 0 |
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| 1992 | 60.3 | 96 | 71.4 | 98 | 49.2 | 88 | 5.66 | 36 | 0 |
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| 1991 | 61 | 82 | 72.8 | 73 | 49.3 | 84 | 7.39 | 22 | 0 |
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| 1990 | 63.6 | 45 | 74.8 | 48 | 52.4 | 44 | 2.50 | 88 | 0 |
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| 1989 | 57.5 | 121 | 69.4 | 121 | 45.7 | 120 | 2.26 | 91 | 0 |
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| 1988 | 61.6 | 74 | 74.2 | 58 | 49 | 91 | 2.93 | 79 | 0 |
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| 1987 | 59.1 | 114 | 70.5 | 112 | 47.6 | 106 | 2.48 | 90 | 0 |
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| 1986 | 62.5 | 57 | 72 | 90 | 52.9 | 32 | 10.66 | 6 | 0 |
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| 1985 | 60.7 | 88 | 70.9 | 106 | 50.5 | 68 | 5.65 | 37 | 0 |
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| 1984 | 60.9 | 85 | 72.8 | 73 | 49 | 91 | 2.19 | 95 | 0 |
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| 1983 | 62.5 | 57 | 74 | 60 | 50.9 | 63 | 4.15 | 53 | 0 |
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| 1982 | 62.1 | 62 | 74.3 | 55 | 50 | 81 | 3.94 | 59 | 0 |
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| 1981 | 59.9 | 105 | 71.3 | 100 | 48.5 | 96 | 3.76 | 64 | 0 |
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| 1980 | 61.2 | 77 | 72.8 | 73 | 49.7 | 83 | 6.16 | 32 | 0 |
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| 1979 | 59.8 | 108 | 72.5 | 82 | 47.2 | 109 | 0.52 | 123 | 0 |
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| 1978 | 64.4 | 32 | 76.3 | 28 | 52.5 | 41 | 4.88 | 44 | 0 |
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| 1977 | 60.1 | 102 | 69.7 | 117 | 50.5 | 68 | 4.86 | 45 | 0 |
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| 1976 | 58.7 | 117 | 72.8 | 73 | 44.6 | 122 | 2.74 | 86 | 0 |
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| 1975 | 57.1 | 123 | 69.7 | 117 | 44.4 | 124 | 1.11 | 116 | 0 |
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| 1974 | 57.8 | 120 | 69.9 | 116 | 45.8 | 119 | 1.20 | 112 | 0 |
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| 1973 | 63.6 | 45 | 72.3 | 86 | 54.9 | 13 | 9.43 | 8 | 0 |
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| 1972 | 61.7 | 71 | 70.8 | 109 | 52.7 | 36 | 6.63 | 30 | 0 |
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| 1971 | 65.9 | 18 | 77.2 | 19 | 54.7 | 14 | 2.99 | 78 | 0 |
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| 1970 | 62.4 | 60 | 72.3 | 86 | 52.6 | 37 | 11.41 | 2 | 0 |
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| 1969 | 63.1 | 49 | 73.7 | 61 | 52.5 | 41 | 2.12 | 97 | 0 |
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| 1968 | 61 | 82 | 70.9 | 106 | 51.1 | 61 | 6.96 | 25 | 0 |
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| 1967 | 62.1 | 62 | 73.1 | 70 | 51 | 62 | 3.70 | 66 | 0 |
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| 1966 | 61.1 | 79 | 73.6 | 64 | 48.5 | 96 | 1.18 | 113 | 0 |
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| 1965 | 59.9 | 105 | 68.5 | 123 | 51.2 | 59 | 8.65 | 13 | 0 |
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| 1964 | 59.5 | 110 | 70.9 | 106 | 48 | 101 | 3.40 | 73 | 0 |
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| 1963 | 64 | 38 | 76.3 | 28 | 51.7 | 53 | 3.95 | 58 | 0 |
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| 1962 | 60.4 | 92 | 70.2 | 114 | 50.5 | 68 | 2.26 | 91 | 0 |
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| 1961 | 63.1 | 49 | 74.1 | 59 | 52 | 51 | 10.68 | 4 | 0 |
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| 1960 | 63.9 | 40 | 74.6 | 51 | 53.2 | 29 | 4.60 | 47 | 0 |
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| 1959 | 63.7 | 44 | 73.7 | 61 | 53.6 | 26 | 8.66 | 12 | 0 |
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| 1958 | 62 | 65 | 73.6 | 64 | 50.4 | 74 | 4.01 | 56 | 0 |
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| 1957 | 59.6 | 109 | 71.7 | 93 | 47.6 | 106 | 0.63 | 122 | 0 |
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| 1956 | 60.8 | 87 | 74.5 | 52 | 47.2 | 109 | 0.50 | 124 | 0 |
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| 1955 | 63.8 | 41 | 76.3 | 28 | 51.2 | 59 | 4.08 | 54 | 0 |
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| 1954 | 64.4 | 32 | 75.4 | 43 | 53.5 | 27 | 5.64 | 38 | 0 |
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| 1953 | 61.9 | 68 | 75.9 | 37 | 48 | 101 | 3.89 | 61 | 0 |
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| 1952 | 59.4 | 111 | 72.8 | 73 | 46.1 | 118 | 0.94 | 119 | 0 |
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| 1951 | 60.3 | 96 | 70.5 | 112 | 50.1 | 80 | 4.56 | 48 | 0 |
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| 1950 | 60.9 | 85 | 71.2 | 101 | 50.5 | 68 | 6.54 | 31 | 0 |
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| 1949 | 60.6 | 90 | 72.6 | 80 | 48.6 | 95 | 3.30 | 74 | 0 |
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| 1948 | 64.6 | 30 | 77 | 22 | 52.3 | 46 | 2.80 | 82 | 0 |
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| 1947 | 66.5 | 11 | 78.9 | 10 | 54.2 | 18 | 2.80 | 82 | 0 |
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| 1945 | 61.3 | 75 | 72.4 | 83 | 50.2 | 79 | 8.73 | 11 | 0 |
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| 1944 | 64.2 | 36 | 74.3 | 55 | 54.2 | 18 | 3.50 | 69 | 0 |
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| 1943 | 59.9 | 105 | 72.9 | 72 | 46.8 | 115 | 1.61 | 109 | 0 |
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| 1942 | 61.9 | 68 | 73.3 | 66 | 50.5 | 68 | 7.24 | 24 | 0 |
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| 1941 | 65.7 | 22 | 77.6 | 14 | 53.8 | 24 | 13.34 | 1 | 1 |
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| 1940 | 62.7 | 54 | 76.3 | 28 | 49.1 | 89 | 1.07 | 117 | 0 |
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| 1939 | 67.9 | 4 | 81.7 | 1 | 54.1 | 20 | 1.77 | 105 | 0 |
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| 1938 | 63.4 | 47 | 74.5 | 52 | 52.2 | 48 | 7.56 | 20 | 0 |
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| 1937 | 62.6 | 56 | 74.8 | 48 | 50.4 | 74 | 2.74 | 86 | 0 |
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| 1936 | 63.8 | 41 | 74.3 | 55 | 53.4 | 28 | 8.17 | 18 | 0 |
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| 1935 | 60.1 | 102 | 72.7 | 79 | 47.6 | 106 | 2.78 | 84 | 0 |
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| 1934 | 62.3 | 61 | 73.2 | 68 | 51.4 | 56 | 3.84 | 62 | 1 |
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| 1933 | 65.1 | 28 | 77.5 | 17 | 52.9 | 32 | 3.17 | 77 | 1 |
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| 1932 | 61 | 82 | 74.9 | 45 | 47.1 | 111 | 3.71 | 65 | 0 |
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| 1931 | 68.6 | 3 | 80.1 | 7 | 57.1 | 4 | 5.04 | 42 | 0 |
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| 1930 | 64.3 | 35 | 77.7 | 13 | 50.9 | 63 | 6.78 | 28 | 0 |
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| 1929 | 60.4 | 92 | 72.6 | 80 | 48.1 | 100 | 5.01 | 43 | 1 |
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| 1928 | 61.1 | 79 | 75.3 | 44 | 46.9 | 113 | 1.91 | 102 | 0 |
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| 1927 | 65.8 | 19 | 77.1 | 21 | 54.6 | 16 | 10.67 | 5 | 0 |
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| 1926 | 62.8 | 53 | 72.4 | 83 | 52.6 | 37 | 8.05 | 19 | 1 |
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| 1925 | 65.2 | 26 | 76.3 | 28 | 54 | 22 | 6.87 | 27 | 0 |
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| 1924 | 58.9 | 116 | 71.2 | 101 | 46.6 | 116 | 2.21 | 94 | 0 |
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| 1923 | 61.7 | 71 | 74.7 | 50 | 48.7 | 94 | 3.44 | 71 | 0 |
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| 1922 | 66.7 | 9 | 80.5 | 4 | 52.8 | 35 | 1.62 | 108 | 0 |
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| 1921 | 64.6 | 30 | 76.9 | 24 | 52.3 | 46 | 7.37 | 23 | 0 |
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| 1920 | 66 | 17 | 80.5 | 4 | 51.5 | 55 | 0.77 | 120 | 0 |
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| 1919 | 65.5 | 23 | 76.8 | 25 | 54.1 | 20 | 8.20 | 17 | 0 |
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| 1918 | 56.9 | 124 | 69.5 | 120 | 44.5 | 123 | 1.70 | 106 | 1 |
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| 1917 | 59 | 115 | 71.4 | 98 | 46.6 | 116 | 3.79 | 63 | 1 |
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| 1916 | 61.7 | 71 | 75.7 | 41 | 47.9 | 104 | 7.52 | 21 | 1 |
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| 1915 | 61.8 | 70 | 72.8 | 73 | 50.8 | 67 | 6.12 | 33 | 1 |
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| 1914 | 64.8 | 29 | 77 | 22 | 52.6 | 37 | 3.98 | 57 | 0 |
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| 1913 | 64 | 38 | 76.1 | 34 | 51.9 | 52 | 4.49 | 49 | 0 |
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| 1912 | 62.7 | 54 | 72.4 | 83 | 53 | 31 | 5.54 | 39 | 0 |
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| 1911 | 62.1 | 62 | 71.7 | 93 | 52.4 | 44 | 8.38 | 15 | 1 |
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| 1910 | 61.1 | 79 | 71 | 105 | 51.4 | 56 | 2.76 | 85 | 1 |
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| 1909 | 60.2 | 99 | 71.1 | 103 | 49.3 | 84 | 3.41 | 72 | 0 |
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| 1908 | 64.4 | 32 | 76.6 | 26 | 52.2 | 48 | 1.03 | 118 | 0 |
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| 1907 | 60.2 | 99 | 69.6 | 119 | 50.9 | 63 | 5.21 | 41 | 0 |
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| 1906 | 66.2 | 15 | 76.5 | 27 | 55.9 | 8 | 4.69 | 46 | 0 |
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| 1905 | 67.6 | 5 | 77.6 | 14 | 57.5 | 3 | 1.16 | 115 | 0 |
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| 1904 | | | | | | | | | 13 |
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| 1903 | | | | | | | | | 10 |
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| 1897 | 69 | 1 | 81.3 | 3 | 56.7 | 5 | 1.18 | 113 | 0 |
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| 1896 | 58.6 | 119 | 69.4 | 121 | 48.5 | 96 | 8.33 | 16 | 2 |
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| 1895 | 66.7 | 9 | 77.6 | 14 | 55.8 | 9 | 3.47 | 70 | 0 |
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| 1893 | | | | | | | | | 10 |
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