Every April in Klamath Falls, OR from 1899 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 | 44.1 | 75 | 60.1 | 49 | 28 | 112 | 0.46 | 85 | 0 |
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| 2025 | 46.8 | 40 | 62.8 | 27 | 30.9 | 71 | 0.58 | 74 | 0 |
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| 2024 | 43.8 | 86 | 58.4 | 69 | 29.1 | 101 | 1.36 | 23 | 0 |
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| 2023 | 43.1 | 95 | 58.1 | 73 | 28.1 | 109 | 0.33 | 95 | 0 |
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| 2022 | 40.3 | 115 | 53.8 | 111 | 26.3 | 122 | 0.98 | 48 | 1 |
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| 2021 | 45.1 | 62 | 63.6 | 19 | 26.5 | 120 | 0.69 | 62 | 0 |
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| 2020 | 45.4 | 57 | 61.4 | 39 | 29.4 | 97 | 0.23 | 105 | 0 |
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| 2019 | 47 | 39 | 59.6 | 53 | 34.3 | 28 | 1.64 | 12 | 0 |
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| 2018 | 44.6 | 70 | 57.7 | 79 | 31.5 | 63 | 1.69 | 10 | 0 |
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| 2017 | 42.3 | 104 | 54.5 | 107 | 30.1 | 83 | 0.84 | 55 | 0 |
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| 2016 | 48.1 | 26 | 63.5 | 21 | 32.7 | 40 | 0.69 | 62 | 0 |
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| 2015 | 43.3 | 93 | 60.2 | 48 | 26.4 | 121 | 0.08 | 120 | 0 |
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| 2014 | 45.1 | 62 | 61.7 | 35 | 28.6 | 106 | 0.20 | 108 | 0 |
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| 2013 | 44 | 78 | 58.7 | 65 | 29.3 | 98 | 1.05 | 42 | 0 |
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| 2012 | 44.8 | 69 | 57.9 | 76 | 31.8 | 60 | 1.00 | 47 | 0 |
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| 2011 | 39.3 | 120 | 50.6 | 119 | 27.9 | 114 | 1.29 | 29 | 0 |
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| 2010 | 40.1 | 116 | 52.4 | 117 | 27.8 | 116 | 1.46 | 17 | 0 |
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| 2009 | 42.5 | 103 | 56.9 | 87 | 28.1 | 109 | 0.58 | 74 | 0 |
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| 2008 | 39.6 | 118 | 53.9 | 110 | 25.4 | 125 | 0.16 | 114 | 0 |
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| 2007 | 43.8 | 86 | 58.7 | 65 | 28.9 | 103 | 0.63 | 67 | 0 |
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| 2006 | 43.9 | 82 | 55.9 | 96 | 32 | 59 | 1.07 | 40 | 0 |
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| 2005 | 41.9 | 109 | 55.1 | 102 | 28.7 | 105 | 1.91 | 6 | 0 |
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| 2004 | 45.8 | 50 | 61.2 | 41 | 30.3 | 82 | 0.62 | 69 | 0 |
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| 2003 | 39.3 | 120 | 49.4 | 124 | 29.2 | 99 | 1.56 | 15 | 0 |
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| 2002 | 44.3 | 74 | 58.2 | 71 | 30.4 | 78 | 2.06 | 3 | 0 |
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| 2001 | 39.7 | 117 | 52.7 | 115 | 26.7 | 119 | 1.05 | 42 | 0 |
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| 2000 | | | | | | | | | 14 |
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| 1999 | | | | | | | | | 14 |
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| 1998 | 45.2 | 60 | 58.5 | 67 | 32.3 | 52 | 0.45 | 87 | 1 |
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| 1997 | 45.8 | 50 | 58.9 | 62 | 32.7 | 40 | 1.35 | 24 | 1 |
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| 1996 | 47.7 | 32 | 62.7 | 28 | 32.8 | 38 | 0.90 | 53 | 2 |
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| 1995 | 45 | 66 | 58.2 | 71 | 32.1 | 57 | 2.62 | 1 | 1 |
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| 1994 | 48.1 | 26 | 63.7 | 18 | 32.6 | 47 | 0.42 | 89 | 1 |
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| 1993 | 44.6 | 70 | 56.4 | 92 | 32.7 | 40 | 1.73 | 8 | 1 |
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| 1992 | 51.8 | 6 | 67.3 | 3 | 36.5 | 9 | 0.83 | 56 | 3 |
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| 1991 | 42.9 | 97 | 55.4 | 100 | 30.4 | 78 | 0.86 | 54 | 0 |
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| 1990 | 51.3 | 7 | 65.4 | 7 | 37.1 | 6 | 1.37 | 21 | 1 |
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| 1989 | 50.4 | 9 | 63.8 | 17 | 37.1 | 6 | 1.66 | 11 | 1 |
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| 1988 | 48.5 | 21 | 61 | 42 | 36 | 11 | 0.98 | 48 | 1 |
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| 1987 | 52.3 | 4 | 69.6 | 2 | 34.8 | 21 | 0.16 | 114 | 2 |
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| 1986 | 46.4 | 44 | 59.3 | 58 | 33.3 | 35 | 0.18 | 111 | 2 |
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| 1985 | 49.7 | 10 | 65 | 9 | 34.4 | 25 | 0.29 | 100 | 0 |
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| 1984 | 42.7 | 100 | 54.2 | 108 | 31.3 | 65 | 1.10 | 37 | 0 |
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| 1983 | 41.8 | 110 | 53 | 113 | 30.6 | 74 | 1.44 | 18 | 1 |
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| 1982 | 42 | 108 | 54.7 | 105 | 29.2 | 99 | 0.65 | 64 | 0 |
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| 1981 | 47.6 | 36 | 61.5 | 38 | 33.8 | 31 | 1.02 | 46 | 0 |
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| 1980 | 46.7 | 42 | 60.7 | 43 | 32.8 | 38 | 0.61 | 72 | 0 |
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| 1979 | 43.9 | 82 | 56.5 | 90 | 30.9 | 71 | 1.39 | 20 | 1 |
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| 1978 | 42.6 | 102 | 53 | 113 | 32.2 | 54 | 1.71 | 9 | 0 |
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| 1977 | 47.9 | 30 | 63.9 | 16 | 32.3 | 52 | 0.09 | 119 | 1 |
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| 1976 | 43 | 96 | 55.8 | 97 | 30.1 | 83 | 0.11 | 118 | 0 |
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| 1975 | 39.3 | 120 | 50.4 | 120 | 28.3 | 108 | 0.65 | 64 | 0 |
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| 1974 | 43.7 | 88 | 57.8 | 78 | 29.8 | 86 | 0.92 | 50 | 2 |
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| 1973 | 45.8 | 50 | 62 | 33 | 29.6 | 92 | 0.16 | 114 | 1 |
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| 1972 | 42.7 | 100 | 56.4 | 92 | 29 | 102 | 0.62 | 69 | 0 |
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| 1971 | 43.5 | 90 | 57.2 | 83 | 29.7 | 90 | 0.50 | 81 | 0 |
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| 1970 | 39 | 123 | 52 | 118 | 25.9 | 124 | 0.29 | 100 | 0 |
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| 1969 | 44.1 | 75 | 58.5 | 67 | 29.6 | 92 | 0.45 | 87 | 0 |
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| 1968 | 44 | 78 | 60.1 | 49 | 27.9 | 114 | 0.17 | 112 | 1 |
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| 1967 | 36.8 | 125 | 47.2 | 125 | 26.3 | 122 | 1.44 | 18 | 0 |
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| 1966 | 47.7 | 32 | 63.6 | 19 | 31.7 | 61 | 0.48 | 83 | 0 |
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| 1965 | 45.8 | 50 | 57.2 | 83 | 34.3 | 28 | 1.62 | 13 | 0 |
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| 1964 | 42.3 | 104 | 57.7 | 79 | 26.9 | 118 | 0.25 | 103 | 1 |
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| 1963 | 38.7 | 124 | 49.5 | 122 | 27.8 | 116 | 1.78 | 7 | 0 |
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| 1962 | 47.7 | 32 | 64.4 | 13 | 31.1 | 69 | 0.23 | 105 | 0 |
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| 1961 | 45.4 | 57 | 60.5 | 46 | 30.4 | 78 | 0.20 | 108 | 0 |
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| 1960 | 44 | 78 | 58.1 | 73 | 29.8 | 86 | 0.36 | 92 | 0 |
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| 1959 | 47.8 | 31 | 65.1 | 8 | 30.5 | 77 | 0.32 | 96 | 0 |
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| 1958 | 42.9 | 97 | 55.3 | 101 | 30.4 | 78 | 0.39 | 91 | 0 |
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| 1957 | 45.9 | 48 | 57.3 | 82 | 34.4 | 25 | 0.79 | 60 | 1 |
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| 1956 | 48.3 | 24 | 59.6 | 53 | 37.1 | 6 | 0.40 | 90 | 0 |
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| 1955 | 39.6 | 118 | 49.5 | 122 | 29.8 | 86 | 1.03 | 45 | 0 |
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| 1954 | 48 | 29 | 60.3 | 47 | 35.7 | 13 | 1.13 | 36 | 0 |
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| 1953 | 44.1 | 75 | 55.5 | 98 | 32.7 | 40 | 0.60 | 73 | 0 |
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| 1952 | 49.2 | 15 | 62.2 | 31 | 36.2 | 10 | 0.22 | 107 | 0 |
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| 1951 | 51.9 | 5 | 64.8 | 10 | 38.9 | 2 | 1.28 | 30 | 0 |
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| 1950 | 45.9 | 48 | 58.9 | 62 | 32.9 | 37 | 0.75 | 61 | 0 |
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| 1949 | 50.7 | 8 | 66.1 | 5 | 35.4 | 17 | 0.17 | 112 | 0 |
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| 1948 | 40.4 | 114 | 49.8 | 121 | 31 | 70 | 1.23 | 34 | 0 |
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| 1947 | 48.8 | 19 | 61.9 | 34 | 35.7 | 13 | 0.63 | 67 | 0 |
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| 1946 | 48.9 | 18 | 63.3 | 23 | 34.5 | 24 | 0.08 | 120 | 0 |
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| 1945 | 45.1 | 62 | 58 | 75 | 32.2 | 54 | 0.46 | 85 | 0 |
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| 1944 | 43.5 | 90 | 54.9 | 103 | 32.2 | 54 | 1.32 | 27 | 0 |
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| 1943 | 49.6 | 12 | 61.7 | 35 | 37.5 | 5 | 2.00 | 5 | 0 |
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| 1942 | 45.8 | 50 | 58.9 | 62 | 32.7 | 40 | 1.08 | 39 | 0 |
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| 1941 | 47.1 | 38 | 59 | 60 | 35.1 | 19 | 0.80 | 58 | 0 |
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| 1940 | 48.2 | 25 | 60.7 | 43 | 35.7 | 13 | 0.83 | 56 | 0 |
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| 1939 | 52.5 | 3 | 67.3 | 3 | 37.7 | 4 | trace | 123 | 0 |
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| 1938 | 46 | 47 | 57.2 | 83 | 34.8 | 21 | 0.54 | 79 | 0 |
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| 1937 | 43.9 | 82 | 56.5 | 90 | 31.4 | 64 | 1.37 | 21 | 0 |
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| 1936 | 49.7 | 10 | 63.3 | 23 | 36 | 11 | 1.27 | 31 | 0 |
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| 1935 | 45 | 66 | 55.5 | 98 | 34.4 | 25 | 2.50 | 2 | 0 |
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| 1934 | 54.3 | 1 | 69.8 | 1 | 38.7 | 3 | 0.50 | 81 | 1 |
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| 1933 | 46.1 | 46 | 59.6 | 53 | 32.6 | 47 | 1.32 | 27 | 0 |
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| 1932 | 44 | 78 | 56.7 | 88 | 31.2 | 66 | 1.33 | 26 | 0 |
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| 1931 | 49.3 | 14 | 64 | 15 | 34.6 | 23 | 0.57 | 76 | 0 |
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| 1930 | 49 | 16 | 62.5 | 30 | 35.4 | 17 | 1.25 | 32 | 0 |
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| 1929 | 41.6 | 111 | 52.6 | 116 | 30.6 | 74 | 0.51 | 80 | 0 |
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| 1928 | 42.2 | 107 | 54.8 | 104 | 29.5 | 95 | 0.62 | 69 | 0 |
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| 1927 | 41.6 | 111 | 54.6 | 106 | 29.5 | 95 | 2.01 | 4 | 1 |
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| 1926 | 52.6 | 2 | 65.9 | 6 | 39.2 | 1 | 0.92 | 50 | 0 |
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| 1925 | 46.8 | 40 | 59.4 | 56 | 34.3 | 28 | 1.07 | 40 | 0 |
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| 1924 | 48.1 | 26 | 64.1 | 14 | 32.1 | 57 | 0.16 | 114 | 0 |
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| 1923 | 44.4 | 73 | 56 | 95 | 32.7 | 40 | 1.34 | 25 | 0 |
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| 1922 | 42.8 | 99 | 57.2 | 83 | 28.1 | 109 | 0.31 | 98 | 1 |
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| 1921 | 45.1 | 62 | 59 | 60 | 31.2 | 66 | 0.31 | 98 | 3 |
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| 1920 | 43.2 | 94 | 56.7 | 88 | 29.6 | 92 | 1.61 | 14 | 0 |
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| 1919 | 47.6 | 36 | 62.6 | 29 | 32.6 | 47 | 0.48 | 83 | 0 |
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| 1918 | 45 | 66 | 59.9 | 52 | 30 | 85 | 0.32 | 96 | 0 |
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| 1917 | 41.1 | 113 | 53.4 | 112 | 28.8 | 104 | 1.24 | 33 | 0 |
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| 1916 | 46.5 | 43 | 61.4 | 39 | 31.6 | 62 | 0.34 | 94 | 0 |
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| 1915 | 49.5 | 13 | 63.4 | 22 | 35.7 | 13 | 0.91 | 52 | 0 |
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| 1914 | 45.7 | 56 | 57.9 | 76 | 33.6 | 34 | 0.80 | 58 | 1 |
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| 1913 | 43.7 | 88 | 56.2 | 94 | 31.2 | 66 | 1.05 | 42 | 0 |
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| 1912 | 42.3 | 104 | 54 | 109 | 30.6 | 74 | 1.49 | 16 | 0 |
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| 1911 | 44.6 | 70 | 58.3 | 70 | 30.9 | 71 | 1.10 | 37 | 0 |
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| 1910 | 49 | 16 | 64.8 | 10 | 33.3 | 35 | 0.28 | 102 | 0 |
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| 1909 | 43.9 | 82 | 59.4 | 56 | 28.6 | 106 | 0.01 | 122 | 2 |
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| 1908 | 48.5 | 21 | 63.3 | 23 | 33.8 | 31 | 0.55 | 77 | 0 |
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| 1907 | 48.5 | 21 | 62.1 | 32 | 34.9 | 20 | 0.55 | 77 | 0 |
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| 1906 | 47.7 | 32 | 61.7 | 35 | 33.7 | 33 | 0.35 | 93 | 0 |
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| 1905 | 48.7 | 20 | 64.6 | 12 | 32.7 | 40 | 0.65 | 64 | 0 |
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| 1904 | | | | | | | | | 5 |
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| 1903 | 45.4 | 57 | 63.2 | 26 | 28 | 112 | 0.20 | 108 | 1 |
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| 1902 | 45.2 | 60 | 60.6 | 45 | 29.8 | 86 | 1.17 | 35 | 0 |
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| 1901 | 43.5 | 90 | 57.6 | 81 | 29.7 | 90 | | | 3 |
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| 1900 | 45.8 | 50 | 59.1 | 59 | 32.5 | 51 | | | 0 |
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| 1899 | 46.3 | 45 | 60 | 51 | 32.6 | 47 | 0.25 | 103 | 0 |
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