Every 1 to 10 October in Casper, WY from 1940 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 | 60.3 | 2 | 80.5 | 1 | 40.1 | 15 | 0.02 | 66 | 0 |
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| 2025 | 52.3 | 32 | 67.3 | 38 | 37.3 | 26 | 0.66 | 18 | 0 |
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| 2024 | 56.1 | 10 | 77.7 | 3 | 34.4 | 53 | 0.00 | 78 | 0 |
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| 2023 | 52.2 | 34 | 68.3 | 33 | 36.1 | 36 | 0.05 | 58 | 0 |
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| 2022 | 51.1 | 42 | 68.4 | 32 | 33.7 | 60 | 0.07 | 55 | 0 |
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| 2021 | 55 | 18 | 69.9 | 23 | 40 | 17 | 0.10 | 54 | 0 |
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| 2020 | 56 | 12 | 76.1 | 5 | 35.8 | 40 | 0.00 | 78 | 0 |
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| 2019 | 43.4 | 82 | 58.2 | 73 | 28.5 | 84 | 0.42 | 31 | 0 |
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| 2018 | 44.6 | 74 | 55.2 | 83 | 34 | 55 | 1.44 | 5 | 0 |
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| 2017 | 43.6 | 80 | 55.6 | 81 | 31.5 | 77 | 0.90 | 11 | 0 |
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| 2016 | 51 | 43 | 65.9 | 49 | 36.1 | 36 | 0.05 | 58 | 0 |
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| 2015 | 56.8 | 7 | 70.3 | 21 | 43.2 | 3 | 0.07 | 55 | 0 |
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| 2014 | 50.9 | 45 | 67 | 40 | 34.8 | 47 | 0.58 | 24 | 0 |
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| 2013 | 43.4 | 82 | 53.7 | 84 | 33.1 | 66 | 2.41 | 2 | 0 |
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| 2012 | 44 | 77 | 58.4 | 72 | 29.6 | 81 | 0.15 | 46 | 0 |
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| 2011 | 54.8 | 21 | 67.2 | 39 | 42.3 | 4 | 1.11 | 7 | 0 |
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| 2010 | 56.6 | 8 | 72.8 | 12 | 40.3 | 12 | 0.12 | 48 | 0 |
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| 2009 | 33.9 | 87 | 43.3 | 87 | 24.4 | 87 | 0.79 | 12 | 0 |
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| 2008 | 49.7 | 54 | 66.1 | 48 | 33.2 | 65 | 0.68 | 17 | 0 |
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| 2007 | 52.8 | 29 | 69.3 | 26 | 36.3 | 33 | 0.38 | 33 | 0 |
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| 2006 | 52 | 35 | 63.8 | 55 | 40.2 | 13 | 0.28 | 41 | 0 |
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| 2005 | 48.4 | 61 | 60.7 | 64 | 36.1 | 36 | 1.16 | 6 | 0 |
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| 2004 | 52.7 | 30 | 69 | 29 | 36.3 | 33 | 0.11 | 52 | 0 |
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| 2003 | 52.9 | 28 | 73 | 11 | 32.7 | 70 | trace | 72 | 0 |
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| 2002 | 45.1 | 73 | 57.2 | 76 | 33 | 67 | 0.43 | 30 | 0 |
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| 2001 | 49 | 57 | 64 | 54 | 34 | 55 | 0.33 | 37 | 0 |
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| 2000 | 43.9 | 78 | 60 | 66 | 27.7 | 85 | 0.01 | 69 | 0 |
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| 1999 | 48.8 | 58 | 66.7 | 43 | 30.8 | 79 | 0.04 | 63 | 0 |
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| 1998 | 48.6 | 60 | 61.5 | 62 | 35.6 | 43 | 0.93 | 9 | 0 |
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| 1997 | 55.6 | 13 | 72.8 | 12 | 38.4 | 19 | 0.30 | 40 | 0 |
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| 1996 | 54.5 | 22 | 74 | 8 | 34.9 | 46 | 0.05 | 58 | 0 |
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| 1995 | 46.7 | 67 | 59.4 | 68 | 34 | 55 | 0.50 | 27 | 0 |
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| 1994 | 47.3 | 65 | 57.9 | 74 | 36.6 | 32 | 1.98 | 3 | 0 |
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| 1993 | 51.6 | 39 | 66.4 | 45 | 36.8 | 30 | 0.73 | 14 | 0 |
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| 1992 | 52.3 | 32 | 68.5 | 31 | 36.1 | 36 | 0.20 | 44 | 0 |
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| 1991 | 54.1 | 24 | 71.4 | 18 | 36.8 | 30 | 0.12 | 48 | 0 |
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| 1990 | 47.4 | 64 | 61.2 | 63 | 33.6 | 62 | 0.12 | 48 | 0 |
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| 1989 | 48.7 | 59 | 62.6 | 59 | 34.8 | 47 | trace | 72 | 0 |
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| 1988 | 51.9 | 36 | 69.1 | 27 | 34.7 | 50 | 0.01 | 69 | 0 |
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| 1987 | 50.9 | 45 | 68.3 | 33 | 33.4 | 64 | 0.00 | 78 | 0 |
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| 1986 | 45.3 | 71 | 56.1 | 79 | 34.5 | 52 | 1.82 | 4 | 0 |
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| 1985 | 40.2 | 86 | 55.7 | 80 | 24.6 | 86 | 0.36 | 35 | 0 |
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| 1984 | 51.3 | 41 | 68.3 | 33 | 34.2 | 54 | 0.05 | 58 | 0 |
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| 1983 | 52.6 | 31 | 67.4 | 37 | 37.7 | 22 | 0.42 | 31 | 0 |
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| 1982 | 43.9 | 78 | 55.3 | 82 | 32.5 | 73 | 0.60 | 22 | 0 |
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| 1981 | 51.9 | 36 | 66.4 | 45 | 37.3 | 26 | 0.05 | 58 | 0 |
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| 1980 | 53.7 | 26 | 72.7 | 15 | 34.6 | 51 | 0.00 | 78 | 0 |
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| 1979 | 53.8 | 25 | 71.7 | 17 | 35.8 | 40 | 0.04 | 63 | 0 |
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| 1978 | 50.5 | 48 | 67.9 | 36 | 33 | 67 | 0.00 | 78 | 0 |
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| 1977 | 46 | 69 | 59.8 | 67 | 32.1 | 74 | 0.47 | 28 | 0 |
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| 1976 | 50.2 | 50 | 63.1 | 57 | 37.3 | 26 | 0.62 | 21 | 0 |
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| 1975 | 56.3 | 9 | 73.8 | 9 | 38.7 | 18 | 0.01 | 69 | 0 |
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| 1974 | 50.1 | 51 | 64.9 | 52 | 35.3 | 44 | 0.38 | 33 | 0 |
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| 1973 | 49.7 | 54 | 63.6 | 56 | 35.7 | 42 | 0.60 | 22 | 0 |
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| 1972 | 50.9 | 45 | 65.4 | 50 | 36.3 | 33 | 0.91 | 10 | 0 |
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| 1971 | 49.9 | 53 | 65 | 51 | 34.8 | 47 | 0.15 | 46 | 0 |
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| 1970 | 44.3 | 75 | 58.9 | 71 | 29.6 | 81 | 0.73 | 14 | 0 |
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| 1969 | 44.3 | 75 | 56.9 | 77 | 31.6 | 76 | 0.52 | 26 | 0 |
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| 1968 | 47.8 | 63 | 62.8 | 58 | 32.7 | 70 | 0.28 | 41 | 0 |
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| 1967 | 55.5 | 14 | 69.1 | 27 | 41.9 | 5 | 0.76 | 13 | 0 |
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| 1966 | 50 | 52 | 66.2 | 47 | 33.8 | 59 | 0.34 | 36 | 0 |
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| 1965 | 57.7 | 4 | 74.8 | 7 | 40.6 | 10 | 0.00 | 78 | 0 |
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| 1964 | 48.1 | 62 | 67 | 40 | 29.2 | 83 | 0.00 | 78 | 0 |
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| 1963 | 63.3 | 1 | 78.3 | 2 | 48.2 | 1 | 0.00 | 78 | 0 |
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| 1962 | 55 | 18 | 68.6 | 30 | 41.3 | 6 | 2.49 | 1 | 0 |
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| 1961 | 46.4 | 68 | 57.8 | 75 | 35 | 45 | 0.63 | 20 | 0 |
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| 1960 | 55.1 | 15 | 69.5 | 25 | 40.6 | 10 | 0.23 | 43 | 0 |
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| 1959 | 43.2 | 84 | 56.3 | 78 | 30.1 | 80 | 0.18 | 45 | 0 |
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| 1958 | 53.7 | 26 | 69.7 | 24 | 37.7 | 22 | 0.02 | 66 | 0 |
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| 1957 | 51.5 | 40 | 64.7 | 53 | 38.2 | 20 | 0.12 | 48 | 0 |
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| 1956 | 57.2 | 5 | 73.6 | 10 | 40.7 | 9 | trace | 72 | 0 |
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| 1955 | 56.1 | 10 | 71.1 | 19 | 41.1 | 8 | 0.02 | 66 | 0 |
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| 1954 | 55.1 | 15 | 70 | 22 | 40.1 | 15 | 0.32 | 39 | 0 |
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| 1953 | 55.1 | 15 | 72.8 | 12 | 37.4 | 24 | 0.03 | 65 | 0 |
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| 1952 | 49.7 | 54 | 66.6 | 44 | 32.7 | 70 | trace | 72 | 0 |
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| 1951 | 51.9 | 36 | 62.5 | 60 | 41.2 | 7 | 0.47 | 28 | 0 |
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| 1950 | 45.3 | 71 | 59.3 | 69 | 31.2 | 78 | 0.72 | 16 | 0 |
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| 1949 | 45.6 | 70 | 59.3 | 69 | 31.8 | 75 | 1.05 | 8 | 0 |
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| 1948 | 50.4 | 49 | 66.8 | 42 | 34 | 55 | 0.33 | 37 | 0 |
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| 1947 | 59.8 | 3 | 75.4 | 6 | 44.2 | 2 | trace | 72 | 0 |
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| 1946 | 42.2 | 85 | 51.4 | 86 | 32.9 | 69 | 0.66 | 18 | 0 |
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| 1945 | 54.3 | 23 | 70.5 | 20 | 38 | 21 | 0.00 | 78 | 0 |
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| 1944 | 47 | 66 | 60.4 | 65 | 33.5 | 63 | 0.07 | 55 | 0 |
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| 1943 | 57.2 | 5 | 76.9 | 4 | 37.4 | 24 | 0.00 | 78 | 0 |
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| 1942 | 54.9 | 20 | 72.5 | 16 | 37.3 | 26 | trace | 72 | 0 |
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| 1941 | 43.6 | 80 | 53.5 | 85 | 33.7 | 60 | 0.58 | 24 | 0 |
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| 1940 | 51 | 43 | 61.8 | 61 | 40.2 | 13 | 0.11 | 52 | 0 |
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