Every December in Georgetown, DE from 1946 to 2025, 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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| 2025 | 35.8 | 62 | 44.9 | 63 | 26.7 | 60 | 2.13 | 60 | 0 |
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| 2024 | 39.4 | 42 | 49 | 41 | 29.7 | 41 | 2.95 | 46 | 0 |
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| 2023 | 44 | 9 | 53.2 | 13 | 34.8 | 8 | 7.96 | 2 | 0 |
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| 2022 | 39.8 | 39 | 49.8 | 34 | 29.8 | 38 | 4.08 | 21 | 0 |
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| 2021 | 45.6 | 4 | 55.7 | 4 | 35.5 | 4 | 0.85 | 75 | 0 |
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| 2020 | 41.8 | 22 | 51.1 | 25 | 32.6 | 20 | 5.92 | 7 | 0 |
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| 2019 | 42 | 20 | 51.9 | 20 | 32.1 | 25 | 3.91 | 25 | 0 |
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| 2018 | 44.3 | 7 | 53.1 | 14 | 35.5 | 4 | 3.47 | 33 | 0 |
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| 2017 | 37.1 | 54 | 46.3 | 54 | 28 | 52 | 0.96 | 74 | 0 |
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| 2016 | 40.1 | 34 | 49.4 | 39 | 30.7 | 32 | 2.80 | 51 | 0 |
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| 2015 | 52.1 | 1 | 61.3 | 1 | 43 | 1 | 4.16 | 19 | 0 |
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| 2014 | 42.4 | 18 | 49.8 | 34 | 34.9 | 7 | 3.53 | 32 | 0 |
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| 2013 | 42.5 | 17 | 52 | 19 | 33.1 | 15 | 4.89 | 14 | 0 |
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| 2012 | 45.7 | 3 | 54.3 | 7 | 37.1 | 2 | 2.99 | 45 | 0 |
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| 2011 | 44.5 | 6 | 55.2 | 5 | 33.7 | 13 | 1.77 | 67 | 0 |
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| 2010 | 32.3 | 71 | 39.7 | 76 | 24.8 | 68 | 2.01 | 62 | 0 |
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| 2009 | 38.9 | 44 | 46.4 | 53 | 31.3 | 29 | 7.16 | 3 | 0 |
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| 2008 | 42.7 | 15 | 52.1 | 18 | 33.3 | 14 | 4.84 | 15 | 0 |
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| 2007 | 40.1 | 34 | 48.3 | 44 | 31.8 | 26 | 4.07 | 22 | 0 |
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| 2006 | 43.6 | 13 | 54.2 | 8 | 33 | 16 | 2.02 | 61 | 0 |
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| 2005 | 36.9 | 55 | 45.7 | 59 | 28.1 | 51 | 3.33 | 36 | 0 |
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| 2004 | 39.6 | 40 | 49.3 | 40 | 29.8 | 38 | 2.73 | 52 | 0 |
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| 2003 | 38.4 | 47 | 47.2 | 47 | 29.6 | 43 | 5.78 | 9 | 0 |
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| 2002 | 37.5 | 51 | 46.5 | 52 | 28.6 | 47 | 3.62 | 30 | 0 |
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| 2001 | 44 | 9 | 53.9 | 9 | 34.1 | 10 | 1.86 | 65 | 0 |
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| 2000 | 31.5 | 74 | 40.5 | 73 | 22.6 | 74 | 2.23 | 59 | 0 |
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| 1999 | 41 | 30 | 49.6 | 37 | 32.3 | 21 | 3.18 | 42 | 0 |
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| 1998 | 41.5 | 24 | 50.8 | 29 | 32.2 | 24 | 3.82 | 26 | 0 |
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| 1996 | 41.5 | 24 | 50.1 | 33 | 32.8 | 19 | 7.00 | 4 | 0 |
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| 1995 | 33.2 | 69 | 41.6 | 72 | 24.7 | 70 | 1.92 | 64 | 0 |
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| 1994 | 42.6 | 16 | 52.8 | 16 | 32.3 | 21 | 1.52 | 71 | 0 |
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| 1993 | 35.9 | 61 | 44.9 | 63 | 27 | 58 | 4.05 | 23 | 0 |
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| 1992 | 38.5 | 46 | 46.8 | 50 | 30.3 | 34 | 4.10 | 20 | 0 |
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| 1991 | 42.2 | 19 | 53.8 | 10 | 30.7 | 32 | 4.70 | 16 | 0 |
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| 1990 | 44 | 9 | 55.1 | 6 | 32.9 | 17 | 3.33 | 36 | 0 |
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| 1989 | 25.7 | 78 | 34.3 | 78 | 17.2 | 78 | 1.35 | 72 | 0 |
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| 1988 | 36.2 | 60 | 46.6 | 51 | 25.8 | 63 | 1.00 | 73 | 0 |
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| 1987 | 40.8 | 31 | 49.8 | 34 | 31.7 | 27 | 2.87 | 48 | 0 |
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| 1986 | 38.4 | 47 | 48.8 | 43 | 27.9 | 53 | 5.82 | 8 | 0 |
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| 1985 | 35.1 | 66 | 45.3 | 61 | 24.8 | 68 | 1.77 | 67 | 0 |
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| 1984 | 44.9 | 5 | 55.9 | 3 | 33.8 | 11 | 1.60 | 70 | 0 |
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| 1983 | 36.7 | 56 | 46.1 | 57 | 27.4 | 57 | 5.19 | 12 | 0 |
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| 1982 | 44.2 | 8 | 53 | 15 | 35.4 | 6 | 3.14 | 43 | 0 |
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| 1981 | 35.8 | 62 | 45.3 | 61 | 26.3 | 62 | 3.77 | 27 | 0 |
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| 1980 | 35.3 | 64 | 44.9 | 63 | 25.7 | 64 | 0.67 | 78 | 0 |
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| 1979 | 39.9 | 37 | 48.9 | 42 | 30.9 | 30 | 1.74 | 69 | 0 |
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| 1978 | 39.4 | 42 | 50.2 | 31 | 28.6 | 47 | 4.47 | 18 | 0 |
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| 1977 | 36.3 | 59 | 45.8 | 58 | 26.7 | 60 | 7.99 | 1 | 0 |
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| 1976 | 32.2 | 73 | 42.6 | 69 | 21.3 | 75 | 2.68 | 53 | 1 |
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| 1975 | 38.9 | 44 | 48.1 | 46 | 29.6 | 43 | 2.00 | 63 | 0 |
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| 1974 | 39.9 | 37 | 50.2 | 31 | 29.8 | 38 | 4.70 | 16 | 1 |
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| 1973 | 40.4 | 33 | 50.5 | 30 | 30.3 | 34 | 5.69 | 10 | 0 |
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| 1972 | 42.9 | 14 | 51.4 | 23 | 34.4 | 9 | 4.92 | 13 | 0 |
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| 1971 | 43.8 | 12 | 53.8 | 10 | 33.8 | 11 | 1.78 | 66 | 0 |
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| 1970 | 36.7 | 56 | 46.3 | 54 | 27 | 58 | 3.43 | 34 | 0 |
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| 1969 | | | | | | | 2.88 | 47 | 7 |
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| 1968 | 35 | 67 | 44.8 | 67 | 25.2 | 66 | 2.33 | 57 | 0 |
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| 1967 | 38.2 | 49 | 47.2 | 47 | 29.2 | 45 | 6.25 | 6 | 0 |
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| 1966 | 37.2 | 53 | 46.2 | 56 | 28.3 | 50 | 3.33 | 36 | 1 |
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| 1965 | 40 | 36 | 51.5 | 22 | 28.5 | 49 | 0.70 | 77 | 1 |
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| 1964 | 42 | 20 | 51.1 | 25 | 32.9 | 17 | 2.34 | 56 | 1 |
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| 1963 | 31.5 | 74 | 39.7 | 76 | 23.2 | 73 | 2.82 | 49 | 0 |
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| 1962 | 32.3 | 71 | 40 | 74 | 25.2 | 66 | 3.62 | 30 | 2 |
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| 1961 | 36.5 | 58 | 45.5 | 60 | 27.6 | 56 | 4.00 | 24 | 0 |
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| 1960 | 31.2 | 76 | 42.1 | 70 | 20.3 | 76 | 3.26 | 41 | 0 |
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| 1959 | 41.4 | 26 | 51 | 27 | 31.7 | 27 | 3.33 | 36 | 0 |
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| 1958 | 29.4 | 77 | 39.9 | 75 | 18.9 | 77 | 2.58 | 54 | 0 |
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| 1957 | 41.6 | 23 | 51 | 27 | 32.3 | 21 | 6.26 | 5 | 0 |
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| 1956 | 46.4 | 2 | 56 | 2 | 36.7 | 3 | 3.69 | 29 | 0 |
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| 1955 | 32.6 | 70 | 42 | 71 | 23.3 | 72 | 0.85 | 75 | 0 |
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| 1954 | 37.5 | 51 | 47.1 | 49 | 27.9 | 53 | 3.43 | 34 | 0 |
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| 1953 | 41.3 | 27 | 51.8 | 21 | 30.9 | 30 | 2.81 | 50 | 0 |
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| 1952 | 38 | 50 | 48.3 | 44 | 27.7 | 55 | 3.31 | 40 | 0 |
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| 1951 | 41.2 | 28 | 52.4 | 17 | 30 | 37 | 3.74 | 28 | 0 |
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| 1950 | 35.2 | 65 | 44.9 | 63 | 25.6 | 65 | 2.56 | 55 | 0 |
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| 1949 | 40.7 | 32 | 51.3 | 24 | 30.1 | 36 | 0.61 | 79 | 0 |
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| 1948 | 39.6 | 40 | 49.5 | 38 | 29.7 | 41 | 5.44 | 11 | 0 |
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| 1947 | 34.5 | 68 | 44.3 | 68 | 24.6 | 71 | 3.05 | 44 | 0 |
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| 1946 | 41.1 | 29 | 53.3 | 12 | 28.9 | 46 | 2.32 | 58 | 0 |
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