Every 1 September to 9 October in Hartford, CT from 1905 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 | 63 | 37 | 73 | 64 | 52.9 | 32 | 5.59 | 37 | 0 |
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| 2025 | 64.4 | 22 | 76.6 | 11 | 52.3 | 44 | 3.89 | 69 | 0 |
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| 2024 | 65.8 | 9 | 77.3 | 8 | 54.3 | 17 | 0.80 | 121 | 0 |
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| 2023 | 66.1 | 6 | 75.8 | 16 | 56.3 | 3 | 13.04 | 3 | 0 |
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| 2022 | 62.8 | 44 | 72.8 | 67 | 52.8 | 35 | 8.55 | 16 | 0 |
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| 2021 | 64.5 | 20 | 74.5 | 34 | 54.6 | 15 | 8.77 | 14 | 0 |
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| 2020 | 62.9 | 40 | 74.6 | 30 | 51.3 | 59 | 2.40 | 101 | 0 |
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| 2019 | 63 | 37 | 74.6 | 30 | 51.3 | 59 | 3.57 | 81 | 0 |
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| 2018 | 66.2 | 5 | 74.5 | 34 | 57.9 | 1 | 7.50 | 20 | 0 |
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| 2017 | 66.8 | 3 | 77.8 | 5 | 55.9 | 5 | 2.97 | 92 | 0 |
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| 2016 | 64.8 | 18 | 75.7 | 19 | 53.9 | 21 | 2.87 | 96 | 0 |
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| 2015 | 65.4 | 14 | 77.7 | 6 | 53.2 | 29 | 5.14 | 45 | 0 |
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| 2014 | 63.5 | 32 | 74.9 | 25 | 52.2 | 46 | 3.33 | 87 | 0 |
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| 2013 | 62.3 | 59 | 74.1 | 43 | 50.4 | 80 | 5.55 | 38 | 0 |
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| 2012 | 62.9 | 40 | 73 | 64 | 52.8 | 35 | 5.67 | 36 | 0 |
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| 2011 | 65.1 | 16 | 74.9 | 25 | 55.3 | 7 | 10.85 | 7 | 0 |
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| 2010 | 65 | 17 | 75.8 | 16 | 54.2 | 19 | 5.79 | 32 | 0 |
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| 2009 | 60.6 | 96 | 71.3 | 96 | 49.9 | 96 | 3.18 | 90 | 0 |
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| 2008 | 62.6 | 52 | 73.2 | 58 | 51.9 | 52 | 9.47 | 9 | 0 |
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| 2007 | 67.3 | 1 | 79.9 | 1 | 54.7 | 14 | 1.28 | 116 | 0 |
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| 2006 | 61.9 | 71 | 73.3 | 56 | 50.5 | 79 | 3.86 | 70 | 0 |
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| 2005 | 66.5 | 4 | 78.5 | 3 | 54.6 | 15 | 6.89 | 25 | 0 |
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| 2004 | 62.7 | 48 | 73.9 | 44 | 51.4 | 57 | 8.36 | 18 | 0 |
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| 2003 | 61.1 | 89 | 71.5 | 90 | 50.7 | 73 | 11.21 | 5 | 0 |
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| 2002 | 65.3 | 15 | 76.8 | 10 | 53.8 | 25 | 3.35 | 86 | 0 |
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| 2001 | 61.5 | 78 | 73.7 | 49 | 49.3 | 104 | 3.25 | 88 | 0 |
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| 2000 | 59.9 | 105 | 70.7 | 103 | 49 | 107 | 4.34 | 60 | 0 |
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| 1999 | 62.8 | 44 | 73.1 | 62 | 52.5 | 41 | 12.26 | 4 | 0 |
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| 1998 | 62.6 | 52 | 74.3 | 39 | 50.9 | 65 | 4.95 | 49 | 0 |
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| 1997 | 61.9 | 71 | 73.2 | 58 | 50.6 | 77 | 1.37 | 112 | 0 |
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| 1996 | 60 | 104 | 69.7 | 112 | 50.3 | 82 | 9.39 | 10 | 0 |
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| 1995 | 61.4 | 81 | 73.2 | 58 | 49.6 | 99 | 5.96 | 28 | 0 |
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| 1994 | 61.2 | 87 | 72.1 | 78 | 50.3 | 82 | 5.70 | 35 | 0 |
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| 1993 | 61.3 | 85 | 71.5 | 90 | 51.1 | 62 | 5.73 | 34 | 0 |
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| 1992 | 60.2 | 101 | 71.4 | 94 | 49 | 107 | 3.24 | 89 | 0 |
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| 1991 | 61.4 | 81 | 72.7 | 70 | 50.2 | 85 | 7.19 | 23 | 0 |
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| 1990 | 64.1 | 23 | 75.3 | 22 | 52.8 | 35 | 3.53 | 82 | 0 |
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| 1989 | 61.6 | 77 | 72.3 | 77 | 50.9 | 65 | 5.50 | 39 | 0 |
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| 1988 | 59.9 | 105 | 71.8 | 81 | 48 | 115 | 2.96 | 94 | 0 |
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| 1987 | 60.5 | 99 | 70.9 | 102 | 50.1 | 90 | 9.24 | 11 | 0 |
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| 1986 | 60.7 | 93 | 71.5 | 90 | 49.9 | 96 | 2.07 | 107 | 0 |
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| 1985 | 61.5 | 78 | 72.8 | 67 | 50.2 | 85 | 5.29 | 41 | 0 |
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| 1984 | 57.7 | 120 | 70.2 | 108 | 45.1 | 121 | 2.20 | 105 | 0 |
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| 1983 | 65.6 | 12 | 78.8 | 2 | 52.4 | 43 | 3.72 | 77 | 0 |
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| 1982 | 62.3 | 59 | 73.3 | 56 | 51.4 | 57 | 4.87 | 51 | 0 |
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| 1981 | 59.8 | 109 | 68.6 | 118 | 50.9 | 65 | 5.95 | 29 | 0 |
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| 1980 | 62.9 | 40 | 74.9 | 25 | 50.8 | 70 | 2.04 | 108 | 0 |
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| 1979 | 60.7 | 93 | 71.8 | 81 | 49.5 | 102 | 6.52 | 27 | 0 |
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| 1978 | 56.9 | 121 | 69.3 | 113 | 44.5 | 122 | 3.80 | 74 | 0 |
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| 1977 | 61.7 | 75 | 71.3 | 96 | 52.1 | 48 | 10.94 | 6 | 0 |
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| 1976 | 62.1 | 65 | 73.5 | 51 | 50.6 | 77 | 4.15 | 64 | 0 |
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| 1975 | 60.6 | 96 | 71.8 | 81 | 49.4 | 103 | 9.02 | 13 | 0 |
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| 1974 | 59.9 | 105 | 71.5 | 90 | 48.4 | 112 | 8.60 | 15 | 0 |
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| 1973 | 63.6 | 30 | 75.5 | 21 | 51.6 | 54 | 4.62 | 57 | 0 |
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| 1972 | 62.2 | 62 | 74.4 | 36 | 50 | 93 | 5.02 | 48 | 0 |
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| 1971 | 65.7 | 11 | 76.2 | 13 | 55.3 | 7 | 4.28 | 62 | 0 |
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| 1970 | 63.7 | 29 | 74.8 | 28 | 52.6 | 39 | 3.98 | 68 | 0 |
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| 1969 | 62.4 | 58 | 73.7 | 49 | 51.1 | 62 | 4.65 | 55 | 0 |
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| 1968 | 62.7 | 48 | 75.1 | 24 | 50.3 | 82 | 3.77 | 76 | 0 |
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| 1967 | 61.8 | 73 | 74.8 | 28 | 48.7 | 110 | 2.87 | 96 | 0 |
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| 1966 | 61.7 | 75 | 73.1 | 62 | 50.4 | 80 | 7.26 | 22 | 0 |
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| 1965 | 60.8 | 92 | 71.6 | 85 | 50 | 93 | 5.79 | 32 | 0 |
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| 1964 | 60.1 | 103 | 72.5 | 72 | 47.6 | 117 | 1.82 | 111 | 0 |
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| 1963 | 59.8 | 109 | 73.2 | 58 | 46.5 | 119 | 5.12 | 47 | 0 |
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| 1962 | 59.2 | 116 | 70.3 | 107 | 48.1 | 114 | 7.19 | 23 | 0 |
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| 1961 | 66.1 | 6 | 78 | 4 | 54.3 | 17 | 5.88 | 31 | 0 |
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| 1960 | 59.5 | 113 | 71.6 | 85 | 47.5 | 118 | 8.51 | 17 | 0 |
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| 1959 | 65.8 | 9 | 76.4 | 12 | 55.1 | 10 | 4.00 | 67 | 0 |
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| 1958 | 59.4 | 114 | 70.5 | 104 | 48.3 | 113 | 7.48 | 21 | 0 |
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| 1957 | 62 | 66 | 73.9 | 44 | 50.1 | 90 | 2.02 | 109 | 1 |
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| 1956 | 56.9 | 121 | 67.9 | 120 | 45.8 | 120 | 5.34 | 40 | 0 |
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| 1955 | 60.9 | 91 | 71.8 | 81 | 50 | 93 | 5.13 | 46 | 0 |
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| 1954 | 61.2 | 87 | 71.6 | 85 | 50.8 | 70 | 6.70 | 26 | 0 |
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| 1953 | 62.7 | 48 | 75.3 | 22 | 50.2 | 85 | 2.38 | 103 | 0 |
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| 1952 | 62.5 | 55 | 74.3 | 39 | 50.8 | 70 | 2.21 | 104 | 0 |
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| 1951 | 62.5 | 55 | 73.4 | 52 | 51.6 | 54 | 4.43 | 59 | 0 |
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| 1950 | 60.4 | 100 | 71.1 | 100 | 49.7 | 98 | 1.09 | 119 | 0 |
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| 1949 | 61.4 | 81 | 72.7 | 70 | 50.1 | 90 | 3.52 | 84 | 0 |
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| 1948 | 62.9 | 40 | 75.7 | 19 | 50.2 | 85 | 1.14 | 118 | 0 |
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| 1947 | 62 | 66 | 73.8 | 46 | 50.2 | 85 | 2.97 | 92 | 0 |
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| 1946 | 63.4 | 35 | 75.8 | 16 | 51.1 | 62 | 2.46 | 99 | 0 |
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| 1945 | 63.5 | 32 | 73.8 | 46 | 53.2 | 29 | 2.42 | 100 | 0 |
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| 1944 | 63.3 | 36 | 74.6 | 30 | 52 | 51 | 9.03 | 12 | 0 |
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| 1943 | 61.3 | 85 | 73.4 | 52 | 49.3 | 104 | 1.01 | 120 | 0 |
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| 1942 | 61.8 | 73 | 72.9 | 66 | 50.7 | 73 | 3.53 | 82 | 0 |
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| 1941 | 64.5 | 20 | 77.6 | 7 | 51.5 | 56 | 1.33 | 113 | 0 |
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| 1940 | 60.2 | 101 | 71.6 | 85 | 48.8 | 109 | 3.83 | 72 | 0 |
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| 1939 | 62.7 | 48 | 72.5 | 72 | 52.9 | 32 | 4.02 | 66 | 0 |
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| 1938 | 59.4 | 114 | 69.2 | 114 | 49.6 | 99 | 14.59 | 1 | 0 |
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| 1937 | 60.6 | 96 | 70.4 | 105 | 50.7 | 73 | 4.22 | 63 | 0 |
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| 1936 | 62.8 | 44 | 71.6 | 85 | 53.9 | 21 | 5.22 | 44 | 0 |
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| 1935 | 58.6 | 117 | 67.5 | 122 | 49.6 | 99 | 5.29 | 41 | 0 |
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| 1934 | 63.5 | 32 | 72 | 79 | 54.9 | 12 | 9.97 | 8 | 0 |
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| 1933 | 63.9 | 26 | 72.4 | 75 | 55.5 | 6 | 5.91 | 30 | 0 |
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| 1932 | 63.8 | 28 | 73.4 | 52 | 54.2 | 19 | 4.76 | 54 | 0 |
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| 1931 | 67.1 | 2 | 77.1 | 9 | 57.2 | 2 | 1.29 | 115 | 0 |
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| 1930 | 64.1 | 23 | 74.4 | 36 | 53.9 | 21 | 1.31 | 114 | 0 |
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| 1929 | 62.2 | 62 | 72.4 | 75 | 52.1 | 48 | 4.13 | 65 | 0 |
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| 1928 | 59.8 | 109 | 68.8 | 117 | 50.9 | 65 | 4.48 | 58 | 0 |
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| 1927 | 64.7 | 19 | 74.6 | 30 | 54.8 | 13 | 2.89 | 95 | 0 |
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| 1926 | 61.1 | 89 | 69.9 | 110 | 52.3 | 44 | 2.76 | 98 | 0 |
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| 1925 | 60.7 | 93 | 69.2 | 114 | 52.1 | 48 | 4.29 | 61 | 0 |
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| 1924 | 59.8 | 109 | 70.4 | 105 | 49.2 | 106 | 4.81 | 53 | 0 |
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| 1923 | 62.3 | 59 | 72 | 79 | 52.6 | 39 | 2.39 | 102 | 0 |
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| 1922 | 65.6 | 12 | 75.9 | 15 | 55.2 | 9 | 3.01 | 91 | 0 |
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| 1921 | 66.1 | 6 | 76.1 | 14 | 56.2 | 4 | 3.60 | 80 | 0 |
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| 1920 | 63.9 | 26 | 74.2 | 41 | 53.6 | 26 | 7.97 | 19 | 0 |
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| 1919 | 62.2 | 62 | 71 | 101 | 53.5 | 27 | 4.84 | 52 | 0 |
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| 1918 | 58.6 | 117 | 68.5 | 119 | 48.7 | 110 | 5.28 | 43 | 0 |
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| 1917 | 57.8 | 119 | 67.8 | 121 | 47.7 | 116 | 2.01 | 110 | 0 |
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| 1916 | 62.5 | 55 | 73.8 | 46 | 51.3 | 59 | 3.46 | 85 | 0 |
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| 1915 | 64 | 25 | 72.8 | 67 | 55.1 | 10 | 3.79 | 75 | 0 |
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| 1914 | 62.6 | 52 | 74.4 | 36 | 50.7 | 73 | 0.20 | 122 | 0 |
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| 1913 | 61.4 | 81 | 69.9 | 110 | 52.9 | 32 | 4.94 | 50 | 0 |
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| 1912 | 62 | 66 | 71.4 | 94 | 52.5 | 41 | 2.14 | 106 | 0 |
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| 1911 | 59.9 | 105 | 69 | 116 | 50.9 | 65 | 3.81 | 73 | 0 |
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| 1910 | 63 | 37 | 72.5 | 72 | 53.5 | 27 | 3.66 | 78 | 0 |
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| 1909 | 61.5 | 78 | 71.2 | 98 | 51.7 | 53 | 3.85 | 71 | 0 |
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| 1908 | 62.8 | 44 | 73.4 | 52 | 52.2 | 46 | 1.16 | 117 | 0 |
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| 1907 | 62 | 66 | 70.1 | 109 | 53.9 | 21 | 13.35 | 2 | 0 |
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| 1906 | 63.6 | 30 | 74.2 | 41 | 53.1 | 31 | 4.65 | 55 | 0 |
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| 1905 | 62 | 66 | 71.2 | 98 | 52.8 | 35 | 3.66 | 78 | 0 |
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