Every 1 September to 10 October in Washington, DC from 1871 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 | 71.6 | 24 | 79.4 | 35 | 63.8 | 13 | 4.92 | 48 | 0 |
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| 2025 | 70.5 | 34 | 79 | 40 | 62.1 | 27 | 3.81 | 80 | 0 |
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| 2024 | 71.1 | 31 | 78.4 | 55 | 63.9 | 12 | 3.79 | 84 | 0 |
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| 2023 | 71.8 | 21 | 80.4 | 26 | 63.3 | 18 | 3.67 | 88 | 0 |
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| 2022 | 69.1 | 55 | 77.8 | 62 | 60.3 | 52 | 4.02 | 73 | 0 |
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| 2021 | 72.7 | 12 | 80.8 | 18 | 64.6 | 7 | 4.09 | 72 | 0 |
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| 2020 | 68.3 | 74 | 76.5 | 91 | 60.1 | 63 | 5.66 | 38 | 0 |
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| 2019 | 75 | 3 | 84.1 | 2 | 65.9 | 3 | 0.27 | 155 | 0 |
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| 2018 | 75.5 | 1 | 82 | 13 | 69 | 1 | 9.73 | 9 | 0 |
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| 2017 | 72.2 | 15 | 80.6 | 24 | 63.8 | 13 | 2.05 | 129 | 0 |
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| 2016 | 73.4 | 8 | 80.4 | 26 | 66.4 | 2 | 3.09 | 106 | 0 |
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| 2015 | 71.5 | 27 | 79.8 | 31 | 63.2 | 21 | 4.48 | 60 | 0 |
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| 2014 | 71.7 | 22 | 79.8 | 31 | 63.6 | 15 | 1.51 | 142 | 0 |
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| 2013 | 71.2 | 29 | 80.7 | 21 | 61.6 | 37 | 4.26 | 68 | 0 |
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| 2012 | 70.2 | 39 | 78.5 | 54 | 61.9 | 32 | 4.97 | 47 | 0 |
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| 2011 | 68.4 | 71 | 75.5 | 114 | 61.4 | 39 | 9.31 | 11 | 0 |
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| 2010 | 72.2 | 15 | 81.9 | 14 | 62.5 | 24 | 6.86 | 32 | 0 |
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| 2009 | 68.7 | 65 | 76.8 | 80 | 60.6 | 47 | 3.34 | 98 | 0 |
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| 2008 | 71.6 | 24 | 79.8 | 31 | 63.5 | 16 | 6.45 | 33 | 0 |
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| 2007 | 73.6 | 6 | 82.9 | 7 | 64.2 | 8 | 0.60 | 154 | 0 |
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| 2006 | 66.8 | 104 | 74.4 | 133 | 59.2 | 79 | 8.56 | 12 | 0 |
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| 2005 | 73.3 | 9 | 82.6 | 9 | 64.1 | 10 | 7.45 | 27 | 0 |
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| 2004 | 69.4 | 49 | 77.1 | 74 | 61.7 | 35 | 4.83 | 51 | 0 |
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| 2003 | 67.5 | 89 | 75.1 | 121 | 59.8 | 67 | 6.87 | 30 | 0 |
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| 2002 | 72.1 | 17 | 80.8 | 18 | 63.5 | 16 | 2.68 | 118 | 0 |
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| 2001 | 66.9 | 100 | 76.4 | 93 | 57.3 | 106 | 1.58 | 138 | 0 |
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| 2000 | 65.9 | 122 | 74 | 138 | 57.9 | 102 | 4.92 | 48 | 0 |
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| 1999 | 67.5 | 89 | 75.4 | 117 | 59.6 | 73 | 11.54 | 3 | 0 |
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| 1998 | 72 | 18 | 80.9 | 16 | 63.1 | 23 | 2.40 | 125 | 0 |
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| 1997 | 70.2 | 39 | 80 | 29 | 60.4 | 49 | 1.60 | 137 | 0 |
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| 1996 | 67.4 | 94 | 75.1 | 121 | 59.7 | 69 | 9.95 | 8 | 0 |
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| 1995 | 70.5 | 34 | 79.3 | 38 | 61.8 | 34 | 5.90 | 36 | 0 |
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| 1994 | 67.7 | 86 | 76.8 | 80 | 58.6 | 90 | 3.13 | 104 | 0 |
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| 1993 | 68.3 | 74 | 77.1 | 74 | 59.6 | 73 | 3.87 | 79 | 0 |
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| 1992 | 66.6 | 108 | 74.9 | 126 | 58.3 | 96 | 4.48 | 60 | 0 |
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| 1991 | 69.4 | 49 | 78.6 | 49 | 60.3 | 52 | 3.88 | 77 | 0 |
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| 1990 | 69.5 | 47 | 78.7 | 48 | 60.3 | 52 | 1.08 | 148 | 0 |
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| 1989 | 68.2 | 77 | 76.5 | 91 | 60 | 65 | 8.51 | 13 | 0 |
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| 1988 | 66.2 | 119 | 75.1 | 121 | 57.2 | 109 | 2.20 | 127 | 0 |
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| 1987 | 68 | 80 | 76.6 | 87 | 59.5 | 76 | 5.97 | 35 | 0 |
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| 1986 | 70.4 | 36 | 78.8 | 42 | 62 | 29 | 0.63 | 153 | 0 |
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| 1985 | 69.5 | 47 | 78.9 | 41 | 60.2 | 60 | 8.09 | 19 | 0 |
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| 1984 | 66.4 | 115 | 74.5 | 132 | 58.4 | 92 | 3.79 | 84 | 0 |
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| 1983 | 71.2 | 29 | 80.8 | 18 | 61.6 | 37 | 2.90 | 111 | 0 |
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| 1982 | 70.3 | 38 | 78.8 | 42 | 61.7 | 35 | 1.71 | 136 | 0 |
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| 1981 | 68.6 | 66 | 77.2 | 73 | 60 | 65 | 2.75 | 117 | 0 |
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| 1980 | 73.8 | 4 | 82.8 | 8 | 64.8 | 6 | 2.51 | 122 | 0 |
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| 1979 | 69.1 | 55 | 76.3 | 101 | 62 | 29 | 11.37 | 4 | 0 |
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| 1978 | 70.2 | 39 | 78.4 | 55 | 62 | 29 | 1.86 | 132 | 0 |
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| 1977 | 71 | 32 | 78.8 | 42 | 63.2 | 21 | 1.43 | 143 | 0 |
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| 1976 | 68.9 | 62 | 77.5 | 68 | 60.4 | 49 | 9.98 | 7 | 0 |
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| 1975 | 66.9 | 100 | 75 | 124 | 58.8 | 86 | 13.57 | 2 | 0 |
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| 1974 | 66.6 | 108 | 76.6 | 87 | 56.7 | 116 | 4.39 | 62 | 0 |
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| 1973 | 73 | 10 | 81.9 | 14 | 64.2 | 8 | 2.81 | 114 | 0 |
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| 1972 | 68.4 | 71 | 77.3 | 72 | 59.4 | 78 | 2.16 | 128 | 0 |
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| 1971 | 71.3 | 28 | 78.6 | 49 | 64 | 11 | 5.64 | 39 | 0 |
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| 1970 | 72.6 | 13 | 83.3 | 4 | 61.9 | 32 | 1.57 | 139 | 0 |
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| 1969 | 69 | 58 | 78.3 | 57 | 59.7 | 69 | 6.08 | 34 | 0 |
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| 1968 | 69.7 | 46 | 80.5 | 25 | 58.9 | 85 | 4.51 | 58 | 0 |
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| 1967 | 67.2 | 97 | 77.9 | 59 | 56.6 | 117 | 0.89 | 150 | 0 |
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| 1966 | 66.3 | 116 | 75.6 | 113 | 57 | 111 | 7.95 | 21 | 0 |
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| 1965 | 69.2 | 53 | 78.8 | 42 | 59.6 | 73 | 4.22 | 69 | 0 |
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| 1964 | 66.3 | 116 | 76.4 | 93 | 56.2 | 126 | 3.68 | 87 | 0 |
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| 1963 | 65.3 | 132 | 76.4 | 93 | 54.2 | 144 | 3.61 | 89 | 0 |
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| 1962 | 66.8 | 104 | 75.3 | 119 | 58.2 | 97 | 4.39 | 62 | 0 |
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| 1961 | 71.7 | 22 | 80.9 | 16 | 62.5 | 24 | 1.31 | 144 | 0 |
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| 1960 | 68.6 | 66 | 76.7 | 84 | 60.6 | 47 | 4.55 | 57 | 0 |
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| 1959 | 73.7 | 5 | 82.2 | 12 | 65.2 | 5 | 2.45 | 123 | 0 |
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| 1958 | 66.9 | 100 | 76.2 | 104 | 57.5 | 105 | 3.81 | 80 | 0 |
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| 1957 | 69 | 58 | 76.6 | 87 | 61.4 | 39 | 5.04 | 46 | 0 |
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| 1956 | 65 | 135 | 73.5 | 142 | 56.6 | 117 | 4.39 | 62 | 0 |
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| 1955 | 68.6 | 66 | 76.4 | 93 | 60.8 | 44 | 1.85 | 133 | 0 |
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| 1954 | 72.3 | 14 | 82.4 | 11 | 62.1 | 27 | 1.08 | 148 | 0 |
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| 1953 | 67.3 | 96 | 77.5 | 68 | 57.1 | 110 | 4.20 | 70 | 0 |
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| 1952 | 66.5 | 111 | 76.2 | 104 | 56.9 | 113 | 4.59 | 56 | 0 |
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| 1951 | 69.4 | 49 | 78.6 | 49 | 60.3 | 52 | 3.49 | 92 | 0 |
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| 1950 | 65.9 | 122 | 73.7 | 141 | 58.2 | 97 | 8.16 | 17 | 0 |
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| 1949 | 67.5 | 89 | 76.6 | 87 | 58.4 | 92 | 3.60 | 90 | 0 |
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| 1948 | 66.9 | 100 | 75.8 | 111 | 58 | 100 | 5.29 | 43 | 0 |
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| 1947 | 67.7 | 86 | 76.2 | 104 | 59.2 | 79 | 4.70 | 54 | 0 |
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| 1946 | 68.2 | 77 | 77.8 | 62 | 58.7 | 87 | 3.16 | 102 | 0 |
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| 1945 | 69 | 58 | 76.9 | 78 | 61.1 | 42 | 4.80 | 52 | 0 |
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| 1944 | 68.4 | 71 | 76.4 | 93 | 60.4 | 49 | 6.88 | 29 | 0 |
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| 1943 | 65.7 | 125 | 76.1 | 107 | 55.4 | 133 | 2.98 | 109 | 0 |
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| 1942 | 68.6 | 66 | 78 | 58 | 59.1 | 82 | 2.89 | 112 | 0 |
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| 1941 | 73.5 | 7 | 83.7 | 3 | 63.3 | 18 | 1.19 | 146 | 0 |
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| 1940 | 65.3 | 132 | 74.2 | 135 | 56.4 | 120 | 2.63 | 119 | 0 |
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| 1939 | 69.2 | 53 | 78.8 | 42 | 59.7 | 69 | 9.41 | 10 | 0 |
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| 1938 | 64.3 | 141 | 72.5 | 150 | 56.1 | 130 | 4.28 | 67 | 0 |
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| 1937 | 64.3 | 141 | 73.4 | 143 | 55.3 | 134 | 3.50 | 91 | 0 |
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| 1936 | 70 | 42 | 78.8 | 42 | 61.3 | 41 | 3.02 | 108 | 0 |
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| 1935 | 63.2 | 148 | 72.7 | 149 | 53.8 | 148 | 8.49 | 14 | 0 |
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| 1934 | 67.8 | 83 | 75.5 | 114 | 60.2 | 60 | 17.99 | 1 | 0 |
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| 1933 | 69 | 58 | 77.7 | 64 | 60.3 | 52 | 3.77 | 86 | 0 |
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| 1932 | 68.1 | 79 | 78.6 | 49 | 57.7 | 104 | 8.22 | 16 | 0 |
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| 1931 | 72.8 | 11 | 83.2 | 5 | 62.5 | 24 | 3.13 | 104 | 0 |
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| 1930 | 72 | 18 | 83 | 6 | 61.1 | 42 | 0.76 | 152 | 0 |
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| 1929 | 66.7 | 106 | 76.8 | 80 | 56.5 | 119 | 6.87 | 30 | 0 |
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| 1928 | 64.4 | 139 | 73 | 145 | 55.8 | 131 | 4.35 | 65 | 0 |
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| 1927 | 69.4 | 49 | 79.7 | 34 | 59.2 | 79 | 3.90 | 76 | 0 |
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| 1926 | 67.9 | 82 | 76.3 | 101 | 59.5 | 76 | 7.79 | 24 | 0 |
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| 1925 | 68.9 | 62 | 77.6 | 66 | 60.3 | 52 | 4.34 | 66 | 0 |
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| 1924 | 63.1 | 149 | 72.9 | 146 | 53.3 | 151 | 7.86 | 23 | 0 |
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| 1923 | 66.1 | 120 | 75.4 | 117 | 56.8 | 115 | 3.15 | 103 | 0 |
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| 1922 | 69.8 | 43 | 79.9 | 30 | 59.8 | 67 | 7.51 | 25 | 0 |
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| 1921 | 70.4 | 36 | 80.7 | 21 | 60.2 | 60 | 3.81 | 80 | 0 |
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| 1920 | 66.1 | 120 | 76 | 110 | 56.2 | 126 | 2.87 | 113 | 0 |
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| 1919 | 69.1 | 55 | 79.2 | 39 | 59 | 83 | 3.29 | 99 | 0 |
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| 1918 | 63.3 | 147 | 74.2 | 135 | 52.4 | 154 | 2.80 | 115 | 0 |
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| 1917 | 61.6 | 155 | 70.9 | 152 | 52.3 | 155 | 1.97 | 131 | 0 |
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| 1916 | 65.4 | 131 | 76.8 | 80 | 54.1 | 146 | 2.61 | 121 | 0 |
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| 1915 | 67.5 | 89 | 77.1 | 74 | 57.9 | 102 | 4.49 | 59 | 0 |
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| 1914 | 65.7 | 125 | 76.4 | 93 | 55 | 136 | 0.85 | 151 | 0 |
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| 1913 | 67 | 99 | 75.8 | 111 | 58.2 | 97 | 3.44 | 93 | 0 |
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| 1912 | 68.3 | 74 | 77.9 | 59 | 58.7 | 87 | 5.86 | 37 | 0 |
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| 1911 | 67.7 | 86 | 76.9 | 78 | 58.5 | 91 | 2.93 | 110 | 0 |
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| 1910 | 69.8 | 43 | 79.4 | 35 | 60.3 | 52 | 3.37 | 96 | 0 |
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| 1909 | 64.5 | 137 | 75 | 124 | 54.1 | 146 | 3.42 | 94 | 0 |
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| 1908 | 64.3 | 141 | 74.9 | 126 | 53.6 | 149 | 4.85 | 50 | 0 |
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| 1907 | 66.7 | 106 | 76.1 | 107 | 57.3 | 106 | 8.01 | 20 | 0 |
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| 1906 | 69.8 | 43 | 79.4 | 35 | 60.3 | 52 | 1.54 | 140 | 0 |
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| 1905 | 67.1 | 98 | 77.9 | 59 | 56.3 | 122 | 2.39 | 126 | 0 |
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| 1904 | 65.2 | 134 | 75.5 | 114 | 54.9 | 137 | 5.35 | 42 | 0 |
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| 1903 | 66.5 | 111 | 76.1 | 107 | 57 | 111 | 3.08 | 107 | 0 |
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| 1902 | 65.5 | 128 | 74.8 | 129 | 56.2 | 126 | 8.43 | 15 | 0 |
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| 1901 | 64.5 | 137 | 74.8 | 129 | 54.2 | 144 | 1.98 | 130 | 0 |
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| 1900 | 72 | 18 | 80.7 | 21 | 63.3 | 18 | 5.37 | 41 | 0 |
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| 1899 | 62.9 | 151 | 73.4 | 143 | 52.5 | 153 | 7.48 | 26 | 0 |
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| 1898 | 70.6 | 33 | 80.4 | 26 | 60.8 | 44 | 1.15 | 147 | 0 |
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| 1897 | 65.9 | 122 | 77.4 | 70 | 54.3 | 142 | 1.54 | 140 | 0 |
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| 1896 | 64.4 | 139 | 74.1 | 137 | 54.7 | 139 | 3.19 | 100 | 0 |
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| 1895 | 67.8 | 83 | 78.6 | 49 | 56.9 | 113 | 1.29 | 145 | 0 |
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| 1894 | 68.9 | 62 | 77.7 | 64 | 60.1 | 63 | 3.38 | 95 | 0 |
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| 1893 | 64.8 | 136 | 73.9 | 139 | 55.7 | 132 | 4.62 | 55 | 0 |
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| 1892 | 63.8 | 145 | 74.3 | 134 | 53.4 | 150 | 3.88 | 77 | 0 |
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| 1891 | 68 | 80 | 77.1 | 74 | 59 | 83 | 3.35 | 97 | 0 |
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| 1890 | 66.6 | 108 | 74.9 | 126 | 58.4 | 92 | 5.39 | 40 | 0 |
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| 1889 | 62.7 | 152 | 70.9 | 152 | 54.6 | 140 | 3.98 | 74 | 0 |
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| 1888 | 62.1 | 154 | 70 | 155 | 54.3 | 142 | 7.14 | 28 | 0 |
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| 1887 | 65.5 | 128 | 74.8 | 129 | 56.3 | 122 | 3.19 | 100 | 0 |
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| 1886 | 66.5 | 111 | 76.7 | 84 | 56.3 | 122 | 1.79 | 134 | 0 |
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| 1885 | 64 | 144 | 72.9 | 146 | 55.1 | 135 | 3.93 | 75 | 0 |
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| 1884 | 71.6 | 24 | 82.6 | 9 | 60.7 | 46 | 0.25 | 156 | 0 |
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| 1883 | 63.4 | 146 | 72.4 | 151 | 54.5 | 141 | 5.24 | 44 | 0 |
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| 1882 | 68.6 | 66 | 77.4 | 70 | 59.7 | 69 | 7.87 | 22 | 0 |
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| 1881 | 75.4 | 2 | 85.5 | 1 | 65.3 | 4 | 2.63 | 119 | 0 |
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| 1880 | 66.3 | 116 | 76.3 | 101 | 56.3 | 122 | 4.18 | 71 | 0 |
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| 1879 | 66.5 | 111 | 76.7 | 84 | 56.4 | 120 | 1.78 | 135 | 0 |
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| 1878 | 67.5 | 89 | 76.4 | 93 | 58.7 | 87 | 2.78 | 116 | 0 |
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| 1877 | 65.5 | 128 | 73.8 | 140 | 57.3 | 106 | 10.62 | 6 | 0 |
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| 1876 | 62.5 | 153 | 70.2 | 154 | 54.8 | 138 | 11.28 | 5 | 0 |
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| 1875 | 63.1 | 149 | 72.9 | 146 | 53.2 | 152 | 2.41 | 124 | 0 |
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| 1874 | 67.4 | 94 | 76.4 | 93 | 58.4 | 92 | 8.12 | 18 | 0 |
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| 1873 | 65.7 | 125 | 75.3 | 119 | 56.2 | 126 | 5.07 | 45 | 0 |
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| 1872 | 67.8 | 83 | 77.6 | 66 | 58 | 100 | 4.74 | 53 | 0 |
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| 1871 | | | | | | | 3.81 | 80 | 40 |
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