Every January in Jerome, ID from 1916 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 | 31.7 | 22 | 37.7 | 44 | 25.6 | 11 | 0.59 | 76 | 0 |
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| 2025 | 27 | 61 | 34.8 | 62 | 19.2 | 59 | 0.19 | 106 | 0 |
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| 2024 | 30.3 | 36 | 36.2 | 51 | 24.5 | 18 | 0.65 | 74 | 0 |
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| 2023 | 27 | 61 | 32.7 | 79 | 21.4 | 46 | 0.68 | 72 | 0 |
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| 2022 | 23 | 86 | 29.1 | 100 | 16.8 | 75 | 0.70 | 70 | 0 |
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| 2021 | 33 | 8 | 39.9 | 20 | 26.2 | 7 | 0.43 | 91 | 0 |
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| 2020 | 32.5 | 15 | 38 | 40 | 27 | 5 | 0.80 | 64 | 0 |
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| 2019 | 31.2 | 26 | 38.3 | 34 | 24.1 | 21 | 1.15 | 40 | 0 |
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| 2018 | 35.6 | 3 | 42.8 | 5 | 28.5 | 2 | 1.30 | 32 | 0 |
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| 2017 | 19.2 | 103 | 26 | 106 | 12.4 | 97 | 1.29 | 34 | 3 |
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| 2016 | 27.1 | 60 | 32.8 | 78 | 21.5 | 42 | 1.21 | 37 | 0 |
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| 2015 | 29.6 | 46 | 35.4 | 58 | 23.9 | 24 | 1.19 | 38 | 0 |
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| 2014 | 30.5 | 32 | 38.1 | 36 | 22.9 | 30 | 0.74 | 66 | 0 |
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| 2013 | 18.9 | 104 | 25.7 | 107 | 12.1 | 98 | 0.28 | 103 | 0 |
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| 2012 | 31.3 | 25 | 39.6 | 21 | 23 | 29 | 3.26 | 4 | 0 |
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| 2011 | 26 | 66 | 32.4 | 80 | 19.7 | 54 | 0.69 | 71 | 0 |
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| 2010 | 30.2 | 37 | 36.1 | 52 | 24.3 | 20 | 1.11 | 44 | 0 |
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| 2009 | 25.1 | 73 | 31.6 | 86 | 18.6 | 63 | 0.58 | 79 | 0 |
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| 2008 | 21.8 | 96 | 29.3 | 99 | 14.4 | 86 | 0.59 | 76 | 0 |
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| 2007 | 24.3 | 78 | 33 | 76 | 15.6 | 79 | 0.22 | 105 | 0 |
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| 2006 | 31.5 | 23 | 37.6 | 45 | 25.4 | 13 | 2.45 | 13 | 0 |
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| 2005 | 28.3 | 53 | 34.4 | 65 | 22.3 | 33 | 0.52 | 82 | 0 |
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| 2004 | 22.9 | 88 | 28.4 | 102 | 17.4 | 71 | 0.43 | 91 | 0 |
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| 2003 | 35.1 | 4 | 42.2 | 7 | 27.9 | 4 | 0.36 | 99 | 2 |
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| 2002 | 23.8 | 81 | 29.8 | 98 | 17.8 | 68 | 0.54 | 81 | 0 |
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| 2001 | 24.1 | 80 | 30.4 | 96 | 17.9 | 67 | 0.49 | 83 | 0 |
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| 2000 | 29.7 | 44 | 35.7 | 56 | 23.6 | 27 | 2.10 | 16 | 0 |
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| 1999 | 30.7 | 29 | 37.3 | 47 | 24.1 | 21 | 2.80 | 5 | 0 |
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| 1998 | 34.9 | 5 | 43.7 | 3 | 26.5 | 6 | 2.39 | 14 | 2 |
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| 1997 | 30.2 | 37 | 38.3 | 34 | 21.5 | 42 | 2.79 | 6 | 3 |
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| 1996 | 30.6 | 31 | 39.1 | 25 | 22.2 | 35 | 2.57 | 12 | 0 |
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| 1995 | 30.7 | 29 | 38.8 | 28 | 22.5 | 32 | 2.21 | 15 | 1 |
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| 1994 | 32.6 | 12 | 42.4 | 6 | 22.7 | 31 | 0.44 | 90 | 0 |
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| 1993 | 21.1 | 99 | 31.1 | 93 | 11.1 | 101 | 1.30 | 32 | 2 |
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| 1992 | 31.5 | 23 | 41.9 | 8 | 21 | 48 | 0.07 | 108 | 0 |
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| 1991 | 25 | 74 | 35.8 | 54 | 14.3 | 87 | 0.49 | 83 | 0 |
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| 1990 | 30.5 | 32 | 39.4 | 23 | 21.6 | 41 | 1.51 | 26 | 0 |
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| 1989 | 22.9 | 88 | 33.1 | 74 | 12.7 | 96 | 0.43 | 91 | 0 |
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| 1988 | 26.1 | 65 | 34.7 | 63 | 17.5 | 70 | 0.58 | 79 | 0 |
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| 1987 | 24.4 | 77 | 33.4 | 72 | 15.4 | 81 | 1.07 | 47 | 1 |
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| 1986 | 29.5 | 48 | 37.4 | 46 | 21.5 | 42 | 1.01 | 51 | 0 |
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| 1985 | 18.1 | 106 | 28.4 | 102 | 7.9 | 106 | 0.37 | 98 | 0 |
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| 1984 | 20.9 | 100 | 29.1 | 100 | 12.8 | 95 | 0.25 | 104 | 0 |
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| 1983 | 33.1 | 7 | 40.6 | 14 | 25.5 | 12 | 0.96 | 56 | 2 |
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| 1982 | 22.5 | 93 | 31 | 95 | 14.1 | 88 | 1.14 | 41 | 1 |
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| 1981 | 33 | 8 | 41.6 | 10 | 23.9 | 24 | 0.74 | 66 | 1 |
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| 1980 | 25.5 | 69 | 33.7 | 71 | 17.3 | 72 | 3.33 | 3 | 0 |
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| 1979 | 15.9 | 108 | 24.6 | 108 | 7.3 | 109 | | | 0 |
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| 1978 | 32.6 | 12 | 39.5 | 22 | 25.8 | 9 | 1.70 | 20 | 0 |
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| 1977 | 23.3 | 85 | 31.3 | 91 | 15.2 | 84 | 0.49 | 83 | 0 |
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| 1976 | 28 | 55 | 36.7 | 50 | 19.2 | 59 | 1.54 | 22 | 0 |
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| 1975 | 25.5 | 69 | 34.2 | 68 | 16.6 | 76 | 0.85 | 61 | 1 |
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| 1974 | 25.5 | 69 | 33.4 | 72 | 17.6 | 69 | 1.35 | 30 | 0 |
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| 1973 | 27.2 | 59 | 34.3 | 67 | 20.1 | 52 | 0.81 | 63 | 0 |
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| 1972 | 27 | 61 | 34.4 | 65 | 19.7 | 54 | 2.75 | 8 | 0 |
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| 1971 | 30.8 | 28 | 37.9 | 42 | 23.7 | 26 | 1.97 | 18 | 0 |
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| 1970 | 31.9 | 20 | 38.9 | 27 | 24.8 | 17 | 4.07 | 2 | 1 |
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| 1969 | 30.2 | 37 | 38.1 | 36 | 22.3 | 33 | 1.29 | 34 | 0 |
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| 1968 | 28.1 | 54 | 38.1 | 36 | 18.2 | 65 | 0.49 | 83 | 0 |
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| 1967 | 33.9 | 6 | 41.8 | 9 | 26 | 8 | 1.77 | 19 | 0 |
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| 1966 | 30.5 | 32 | 39.1 | 25 | 21.9 | 39 | 0.49 | 83 | 0 |
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| 1965 | 31.9 | 20 | 38.7 | 31 | 25.2 | 14 | 1.09 | 46 | 0 |
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| 1964 | 23.6 | 82 | 31.9 | 84 | 15.4 | 81 | 1.53 | 24 | 0 |
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| 1963 | 20.7 | 101 | 32 | 83 | 9.6 | 103 | 1.16 | 39 | 1 |
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| 1962 | 21.2 | 97 | 31.6 | 86 | 11 | 102 | 0.41 | 94 | 1 |
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| 1961 | 32.3 | 16 | 44.9 | 2 | 19.7 | 54 | 0.13 | 107 | 0 |
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| 1960 | 24.3 | 78 | 31.6 | 86 | 16.9 | 73 | 0.86 | 60 | 0 |
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| 1959 | 32.3 | 16 | 40.1 | 17 | 24.5 | 18 | 1.55 | 21 | 0 |
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| 1958 | 29.4 | 49 | 37.2 | 48 | 21.5 | 42 | 1.12 | 43 | 0 |
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| 1957 | 21.2 | 97 | 31.1 | 93 | 11.5 | 99 | 0.59 | 76 | 1 |
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| 1956 | 32.8 | 11 | 40.6 | 14 | 25 | 16 | 2.76 | 7 | 0 |
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| 1955 | 22.8 | 90 | 32.3 | 81 | 13.3 | 93 | 0.98 | 54 | 0 |
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| 1954 | 32.2 | 18 | 41.3 | 12 | 23.2 | 28 | 0.78 | 65 | 0 |
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| 1953 | 38.2 | 1 | 47.4 | 1 | 28.9 | 1 | 2.68 | 9 | 0 |
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| 1952 | 22.7 | 91 | 31.7 | 85 | 13.6 | 92 | 1.36 | 28 | 0 |
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| 1951 | 24.9 | 75 | 35.1 | 60 | 14.7 | 85 | 1.06 | 48 | 0 |
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| 1950 | 22.7 | 91 | 34 | 70 | 11.5 | 99 | 2.65 | 10 | 0 |
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| 1949 | 7.2 | 110 | 19.6 | 110 | -5.3 | 111 | 1.10 | 45 | 0 |
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| 1948 | 28.6 | 51 | 38.1 | 36 | 19.2 | 59 | 0.90 | 57 | 0 |
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| 1947 | 23 | 86 | 32.1 | 82 | 13.9 | 90 | 0.38 | 97 | 0 |
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| 1946 | 24.8 | 76 | 34.2 | 68 | 15.4 | 81 | 1.36 | 28 | 0 |
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| 1945 | 29.7 | 44 | 38.4 | 32 | 21.1 | 47 | 0.39 | 95 | 0 |
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| 1944 | 23.5 | 83 | 33 | 76 | 14 | 89 | 0.73 | 69 | 0 |
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| 1943 | 27.8 | 57 | 36.1 | 52 | 19.5 | 58 | 0.88 | 58 | 0 |
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| 1942 | 22 | 95 | 30.4 | 96 | 13.7 | 91 | 1.43 | 27 | 0 |
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| 1941 | 32 | 19 | 40 | 19 | 24.1 | 21 | 0.66 | 73 | 0 |
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| 1940 | 28.5 | 52 | 37 | 49 | 20 | 53 | 2.63 | 11 | 0 |
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| 1939 | 30.5 | 32 | 38.8 | 28 | 22.2 | 35 | 0.31 | 102 | 0 |
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| 1938 | 32.6 | 12 | 40.1 | 17 | 25.1 | 15 | 0.74 | 66 | 0 |
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| 1937 | 13.9 | 109 | 22.7 | 109 | 5 | 110 | 1.14 | 41 | 0 |
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| 1936 | 25.9 | 67 | 33.1 | 74 | 18.8 | 62 | 4.49 | 1 | 0 |
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| 1935 | 29.6 | 46 | 38.8 | 28 | 20.4 | 51 | 0.47 | 88 | 0 |
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| 1934 | 36.1 | 2 | 43.7 | 3 | 28.5 | 2 | 1.00 | 52 | 0 |
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| 1933 | 25.6 | 68 | 35.1 | 60 | 16.2 | 77 | 1.54 | 22 | 0 |
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| 1932 | 23.5 | 83 | 31.3 | 91 | 15.6 | 79 | 0.99 | 53 | 0 |
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| 1931 | 26.4 | 64 | 35.8 | 54 | 16.9 | 73 | 0.32 | 100 | 0 |
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| 1930 | 18.4 | 105 | 28.1 | 104 | 8.6 | 105 | 0.88 | 58 | 0 |
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| 1929 | 19.6 | 102 | 31.5 | 90 | 7.7 | 108 | 2.00 | 17 | 0 |
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| 1928 | 29.8 | 43 | 37.8 | 43 | 22 | 37 | 0.61 | 75 | 1 |
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| 1927 | 30 | 40 | 38 | 40 | 22 | 37 | 0.84 | 62 | 0 |
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| 1926 | 27.9 | 56 | 35.3 | 59 | 20.5 | 50 | 0.46 | 89 | 0 |
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| 1925 | 27.6 | 58 | 35.6 | 57 | 19.6 | 57 | 1.53 | 24 | 0 |
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| 1924 | 25.2 | 72 | 34.5 | 64 | 15.8 | 78 | 0.32 | 100 | 0 |
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| 1923 | 30.9 | 27 | 41 | 13 | 20.7 | 49 | 1.05 | 49 | 0 |
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| 1922 | | | | | 7.8 | 107 | 1.31 | 31 | 4 |
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| 1921 | 30 | 40 | 38.4 | 32 | 21.7 | 40 | | | 3 |
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| 1920 | 29.2 | 50 | 39.2 | 24 | 18.4 | 64 | 0.07 | 108 | 3 |
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| 1919 | 29.9 | 42 | 41.6 | 10 | 18.2 | 65 | 0.39 | 95 | 1 |
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| 1918 | 33 | 8 | 40.3 | 16 | 25.7 | 10 | 1.05 | 49 | 0 |
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| 1917 | 18.1 | 106 | 27.2 | 105 | 8.8 | 104 | 1.24 | 36 | 1 |
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| 1916 | 22.2 | 94 | 31.6 | 86 | 13.2 | 94 | 0.98 | 54 | 1 |
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