Every December in McAllen, TX from 1941 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 | 68.8 | 4 | 78.7 | 4 | 58.9 | 4 | 0.79 | 38 | 0 |
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| 2024 | 69.4 | 2 | 79.4 | 2 | 59.4 | 3 | 0.61 | 47 | 0 |
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| 2023 | 65.2 | 16 | 75.1 | 26 | 55.3 | 18 | 0.56 | 49 | 0 |
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| 2022 | 64.3 | 24 | 73.5 | 40 | 55.1 | 20 | 0.77 | 39 | 0 |
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| 2021 | 71.5 | 1 | 81 | 1 | 62 | 1 | 0.97 | 33 | 0 |
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| 2020 | 63 | 37 | 76.1 | 18 | 49.8 | 62 | 0.48 | 54 | 0 |
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| 2019 | 65.1 | 17 | 76.5 | 14 | 53.7 | 25 | 0.41 | 57 | 0 |
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| 2018 | 64.7 | 22 | 76.4 | 15 | 53.1 | 27 | 0.51 | 53 | 0 |
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| 2017 | 60.8 | 60 | 70 | 68 | 51.7 | 45 | 1.23 | 23 | 0 |
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| 2016 | 67.9 | 6 | 77.2 | 12 | 58.7 | 6 | 0.63 | 44 | 0 |
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| 2015 | 67.2 | 9 | 78.1 | 8 | 56.3 | 14 | 0.04 | 73 | 0 |
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| 2014 | 64.1 | 26 | 71.7 | 53 | 56.4 | 13 | 0.85 | 36 | 0 |
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| 2013 | 58.5 | 76 | 67.1 | 77 | 50 | 59 | 3.03 | 5 | 0 |
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| 2012 | 67.5 | 7 | 78 | 10 | 57 | 9 | trace | 76 | 0 |
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| 2011 | 61.8 | 51 | 70.8 | 62 | 52.7 | 30 | 2.27 | 10 | 0 |
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| 2010 | 65 | 18 | 76.9 | 13 | 53.1 | 27 | 0.09 | 68 | 0 |
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| 2009 | 58.6 | 75 | 66.9 | 79 | 50.4 | 56 | 4.99 | 1 | 0 |
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| 2008 | 62.9 | 39 | 73.7 | 38 | 52 | 38 | 0.17 | 65 | 0 |
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| 2007 | 67.3 | 8 | 79.1 | 3 | 55.5 | 17 | trace | 76 | 0 |
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| 2006 | 61.2 | 56 | 70.4 | 65 | 52 | 38 | 2.69 | 7 | 0 |
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| 2005 | 61.4 | 54 | 71.6 | 54 | 51.2 | 50 | 0.46 | 55 | 0 |
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| 2004 | 60.4 | 64 | 71.6 | 54 | 49.2 | 67 | 0.85 | 36 | 0 |
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| 2003 | 61 | 58 | 73.8 | 37 | 48.2 | 73 | 0.02 | 75 | 0 |
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| 2002 | 62.9 | 39 | 73.4 | 43 | 52.4 | 32 | 0.19 | 64 | 0 |
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| 2001 | 62.9 | 39 | 73 | 45 | 52.8 | 29 | 1.27 | 21 | 2 |
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| 2000 | 56.2 | 81 | 66.1 | 80 | 46.2 | 82 | 1.14 | 25 | 0 |
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| 1999 | 61.9 | 49 | 73.9 | 35 | 49.8 | 62 | 0.76 | 40 | 0 |
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| 1998 | 62 | 47 | 72 | 50 | 52 | 38 | 0.28 | 61 | 0 |
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| 1997 | 59.8 | 67 | 71.5 | 57 | 48.1 | 74 | | | 0 |
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| 1996 | 65 | 18 | 76 | 19 | 54.1 | 24 | | | 2 |
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| 1995 | 64.1 | 26 | 72 | 50 | 56.1 | 15 | 2.03 | 14 | 0 |
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| 1994 | 65.5 | 14 | 73.6 | 39 | 57.4 | 7 | 1.92 | 16 | 0 |
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| 1993 | 64.3 | 24 | 73.9 | 35 | 54.7 | 21 | 1.03 | 31 | 0 |
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| 1992 | 64.1 | 26 | 72.5 | 47 | 55.7 | 16 | 0.65 | 43 | 0 |
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| 1991 | 63.3 | 35 | 70.1 | 67 | 56.5 | 11 | 2.90 | 6 | 0 |
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| 1990 | 63.4 | 33 | 74.7 | 30 | 52 | 38 | 0.37 | 59 | 0 |
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| 1989 | 51.5 | 85 | 61 | 85 | 42 | 85 | 2.56 | 9 | 0 |
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| 1988 | 64.5 | 23 | 75.4 | 23 | 53.7 | 25 | 0.07 | 71 | 0 |
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| 1987 | 65 | 18 | 75.4 | 23 | 54.6 | 22 | 0.53 | 52 | 0 |
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| 1986 | 59.6 | 71 | 67 | 78 | 52.3 | 34 | 3.60 | 3 | 0 |
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| 1985 | 59.7 | 70 | 69.1 | 71 | 50.4 | 56 | 1.41 | 20 | 0 |
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| 1984 | 69.4 | 2 | 78.1 | 8 | 60.6 | 2 | 1.90 | 17 | 0 |
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| 1983 | 55.3 | 83 | 65.4 | 82 | 45.2 | 83 | 1.26 | 22 | 0 |
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| 1982 | 61.9 | 49 | 71.9 | 52 | 51.9 | 43 | 1.16 | 24 | 0 |
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| 1981 | 63.7 | 31 | 75.5 | 22 | 52 | 38 | 0.22 | 63 | 0 |
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| 1980 | 60.5 | 63 | 70.6 | 64 | 50.5 | 54 | 0.54 | 51 | 0 |
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| 1979 | 60.6 | 61 | 69.9 | 69 | 51.2 | 50 | 3.53 | 4 | 0 |
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| 1978 | 61.6 | 52 | 71.5 | 57 | 51.7 | 45 | 1.04 | 30 | 0 |
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| 1977 | 63.1 | 36 | 74.8 | 29 | 51.4 | 47 | trace | 76 | 0 |
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| 1976 | 55.7 | 82 | 64.5 | 83 | 47 | 79 | 1.57 | 18 | 0 |
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| 1975 | 61.2 | 56 | 72.4 | 49 | 50 | 59 | 0.86 | 35 | 0 |
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| 1974 | 59.8 | 67 | 69 | 72 | 50.7 | 53 | 0.41 | 57 | 0 |
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| 1973 | 62.3 | 45 | 74.9 | 28 | 49.7 | 64 | 0.55 | 50 | 0 |
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| 1972 | 59.6 | 71 | 71.3 | 61 | 47.9 | 76 | 0.42 | 56 | 0 |
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| 1971 | 66.1 | 12 | 75.6 | 21 | 56.5 | 11 | 0.75 | 41 | 0 |
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| 1970 | 68.6 | 5 | 78.3 | 7 | 58.9 | 4 | 0.10 | 67 | 0 |
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| 1969 | 63.4 | 33 | 74.6 | 33 | 52.2 | 36 | 0.09 | 68 | 0 |
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| 1968 | 63 | 37 | 74.7 | 30 | 51.3 | 48 | 0.08 | 70 | 0 |
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| 1967 | 59.4 | 73 | 68.8 | 73 | 49.9 | 61 | 2.23 | 12 | 0 |
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| 1966 | 60.6 | 61 | 72.5 | 47 | 48.7 | 69 | trace | 76 | 0 |
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| 1965 | 64.9 | 21 | 72.8 | 46 | 57 | 9 | 3.88 | 2 | 0 |
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| 1964 | 60 | 66 | 70.4 | 65 | 49.7 | 64 | 1.05 | 29 | 0 |
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| 1963 | 52.8 | 84 | 62.6 | 84 | 43 | 84 | 2.04 | 13 | 0 |
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| 1962 | 58.1 | 77 | 67.8 | 75 | 48.5 | 71 | 1.93 | 15 | 0 |
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| 1961 | 62.5 | 42 | 73.1 | 44 | 51.9 | 43 | trace | 76 | 0 |
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| 1960 | 56.8 | 80 | 65.5 | 81 | 48 | 75 | 2.24 | 11 | 0 |
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| 1959 | 62.5 | 42 | 74.7 | 30 | 50.3 | 58 | 0.17 | 65 | 0 |
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| 1958 | 57.4 | 78 | 68 | 74 | 46.8 | 80 | 1.07 | 28 | 0 |
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| 1957 | 64.1 | 26 | 76 | 19 | 52.2 | 36 | 2.59 | 8 | 0 |
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| 1956 | 63.8 | 30 | 75.3 | 25 | 52.4 | 32 | 1.08 | 27 | 0 |
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| 1955 | 62 | 47 | 73.5 | 40 | 50.5 | 54 | 0.07 | 71 | 0 |
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| 1954 | 63.6 | 32 | 76.3 | 16 | 50.8 | 52 | trace | 76 | 0 |
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| 1953 | 57 | 79 | 67.7 | 76 | 46.4 | 81 | 0.97 | 33 | 0 |
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| 1952 | 59.8 | 67 | 70.7 | 63 | 48.9 | 68 | 0.62 | 45 | 0 |
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| 1951 | 66 | 13 | 77.8 | 11 | 54.2 | 23 | 0.03 | 74 | 0 |
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| 1950 | 62.4 | 44 | 76.2 | 17 | 48.5 | 71 | trace | 76 | 0 |
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| 1949 | 66.2 | 11 | 75.1 | 26 | 57.4 | 7 | 0.62 | 45 | 0 |
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| 1948 | 67 | 10 | 78.7 | 4 | 55.3 | 18 | trace | 76 | 0 |
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| 1947 | 61.4 | 54 | 71.6 | 54 | 51.3 | 48 | 1.01 | 32 | 0 |
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| 1946 | 61 | 58 | 74.5 | 34 | 47.5 | 78 | 0.23 | 62 | 0 |
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| 1945 | 61.5 | 53 | 73.5 | 40 | 49.4 | 66 | 0.72 | 42 | 0 |
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| 1944 | 60.2 | 65 | 71.4 | 60 | 48.6 | 70 | 0.59 | 48 | 1 |
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| 1943 | 58.7 | 74 | 69.9 | 69 | 47.9 | 76 | 1.12 | 26 | 2 |
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| 1942 | 65.4 | 15 | 78.5 | 6 | 52.3 | 34 | 0.37 | 59 | 0 |
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| 1941 | 62.1 | 46 | 71.5 | 57 | 52.7 | 30 | 1.48 | 19 | 0 |
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