Every 1 September to 10 October in Dubuque, IA from 1873 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 | 65 | 12 | 73.7 | 37 | 56.3 | 4 | 10.06 | 9 | 0 |
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| 2025 | | | | | | | | | 10 |
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| 2024 | 64.7 | 16 | 77.6 | 3 | 51.8 | 66 | 0.08 | 152 | 0 |
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| 2023 | 64 | 30 | 74.2 | 30 | 53.8 | 32 | 2.55 | 114 | 0 |
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| 2022 | 61.6 | 73 | 72.4 | 58 | 50.7 | 87 | 0.64 | 151 | 0 |
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| 2021 | 66 | 6 | 76.7 | 5 | 55.2 | 13 | 2.18 | 124 | 0 |
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| 2020 | 58.6 | 118 | 69.3 | 115 | 48 | 128 | 8.26 | 20 | 0 |
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| 2019 | 63.9 | 32 | 72.6 | 53 | 55.1 | 15 | 18.73 | 1 | 0 |
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| 2018 | 62.8 | 47 | 72.1 | 62 | 53.5 | 39 | 15.17 | 3 | 0 |
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| 2017 | 64.1 | 28 | 75.1 | 17 | 53.2 | 42 | 4.95 | 55 | 0 |
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| 2016 | 64.2 | 26 | 73.7 | 37 | 54.7 | 20 | 5.57 | 48 | 0 |
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| 2015 | 64.4 | 22 | 74.3 | 25 | 54.5 | 23 | 4.03 | 79 | 0 |
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| 2014 | 57.9 | 132 | 68.5 | 127 | 47.3 | 138 | 2.61 | 110 | 0 |
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| 2013 | 63.4 | 37 | 74.3 | 25 | 52.5 | 52 | 3.43 | 92 | 0 |
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| 2012 | 56.7 | 148 | 69.6 | 110 | 43.9 | 152 | 1.26 | 145 | 0 |
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| 2011 | 59.1 | 113 | 69.8 | 107 | 48.3 | 123 | 2.50 | 116 | 0 |
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| 2010 | 60 | 101 | 71.7 | 70 | 48.2 | 127 | 2.57 | 112 | 0 |
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| 2009 | 58.2 | 129 | 67.6 | 138 | 48.8 | 115 | 3.31 | 95 | 0 |
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| 2008 | 60.8 | 86 | 70.6 | 93 | 51.1 | 84 | 4.27 | 74 | 0 |
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| 2007 | 64.4 | 22 | 75.8 | 10 | 53.1 | 43 | 5.31 | 51 | 0 |
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| 2006 | 58.7 | 116 | 69 | 120 | 48.4 | 122 | 4.87 | 61 | 0 |
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| 2005 | 64.1 | 28 | 75.8 | 10 | 52.5 | 52 | 2.15 | 125 | 0 |
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| 2004 | 61.5 | 74 | 74.3 | 25 | 48.7 | 118 | 1.79 | 135 | 0 |
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| 2003 | 58.7 | 116 | 71.1 | 80 | 46.2 | 145 | 3.73 | 86 | 0 |
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| 2002 | 62.2 | 61 | 73 | 46 | 51.4 | 75 | 5.93 | 43 | 0 |
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| 2001 | 57.7 | 140 | 67.9 | 134 | 47.6 | 132 | 6.01 | 40 | 0 |
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| 2000 | 58.9 | 115 | 69.2 | 118 | 48.7 | 118 | 3.98 | 81 | 0 |
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| 1999 | 57.8 | 137 | 69 | 120 | 46.7 | 142 | 2.05 | 129 | 0 |
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| 1998 | 62.5 | 57 | 72 | 66 | 53 | 45 | 5.79 | 45 | 0 |
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| 1997 | 63.2 | 40 | 73.4 | 43 | 53 | 45 | 4.24 | 75 | 0 |
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| 1996 | 58.5 | 122 | 68.5 | 127 | 48.6 | 121 | 2.14 | 126 | 0 |
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| 1995 | 58.6 | 118 | 69.4 | 113 | 47.7 | 131 | 2.57 | 112 | 0 |
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| 1994 | 62.2 | 61 | 71.6 | 73 | 52.8 | 49 | 4.77 | 65 | 0 |
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| 1993 | 56.1 | 150 | 65.6 | 152 | 46.6 | 143 | 5.75 | 46 | 0 |
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| 1992 | 58.5 | 122 | 68.7 | 126 | 48.3 | 123 | 4.92 | 57 | 0 |
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| 1991 | 58.6 | 118 | 69.3 | 115 | 47.9 | 129 | 5.00 | 54 | 0 |
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| 1990 | 61.5 | 74 | 71.5 | 75 | 51.6 | 71 | 1.54 | 140 | 0 |
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| 1989 | 55.9 | 151 | 67.4 | 142 | 44.4 | 149 | 3.42 | 93 | 0 |
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| 1988 | 60.7 | 88 | 72.1 | 62 | 49.3 | 107 | 2.77 | 105 | 0 |
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| 1987 | 57.7 | 140 | 67.8 | 135 | 47.5 | 133 | 3.31 | 95 | 0 |
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| 1986 | 60.6 | 91 | 69 | 120 | 52.1 | 63 | 13.95 | 6 | 0 |
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| 1985 | 58 | 130 | 66.7 | 146 | 49.3 | 107 | 6.95 | 26 | 0 |
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| 1984 | 60.5 | 93 | 71.2 | 79 | 49.9 | 99 | 3.23 | 98 | 0 |
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| 1983 | 61.8 | 65 | 73.1 | 45 | 50.5 | 91 | 3.62 | 88 | 0 |
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| 1982 | 61.5 | 74 | 72.6 | 53 | 50.4 | 93 | | | 0 |
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| 1981 | 59.3 | 111 | 69.9 | 104 | 48.8 | 115 | 4.91 | 60 | 0 |
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| 1980 | 61.1 | 83 | 71.8 | 69 | 50.3 | 95 | 6.50 | 32 | 0 |
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| 1979 | 60 | 101 | 71 | 82 | 49 | 113 | 0.76 | 150 | 0 |
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| 1978 | 62.3 | 58 | 73 | 46 | 51.6 | 71 | 6.09 | 37 | 0 |
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| 1977 | 58.5 | 122 | 66.6 | 147 | 50.3 | 95 | 4.80 | 64 | 0 |
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| 1976 | 58 | 130 | 70 | 99 | 46 | 146 | 2.11 | 127 | 0 |
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| 1975 | 56.4 | 149 | 66.9 | 144 | 46 | 146 | 1.91 | 131 | 0 |
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| 1974 | 55.4 | 152 | 66.3 | 150 | 44.4 | 149 | 2.09 | 128 | 0 |
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| 1973 | 62.3 | 58 | 70 | 99 | 54.5 | 23 | 7.70 | 23 | 0 |
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| 1972 | 60 | 101 | 69.3 | 115 | 50.7 | 87 | 5.89 | 44 | 0 |
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| 1971 | 62.6 | 54 | 73 | 46 | 52.2 | 61 | 4.39 | 71 | 0 |
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| 1970 | 61.4 | 77 | 71.1 | 80 | 51.6 | 71 | 9.63 | 12 | 0 |
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| 1969 | 61.8 | 65 | 72.4 | 58 | 51.2 | 80 | 2.33 | 122 | 0 |
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| 1968 | 57.9 | 132 | 67.6 | 138 | 48.3 | 123 | 6.18 | 35 | 0 |
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| 1967 | 59.6 | 108 | 69.9 | 104 | 49.3 | 107 | 14.65 | 4 | 0 |
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| 1966 | 59.2 | 112 | 71.3 | 77 | 47.1 | 140 | 1.66 | 139 | 0 |
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| 1965 | 57.9 | 132 | 66.4 | 148 | 49.3 | 107 | 16.12 | 2 | 0 |
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| 1964 | 57.6 | 142 | 67.5 | 140 | 47.8 | 130 | 2.48 | 118 | 0 |
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| 1963 | 62.7 | 52 | 73.7 | 37 | 51.7 | 68 | 3.09 | 101 | 0 |
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| 1962 | 58.6 | 118 | 68.3 | 130 | 48.9 | 114 | 5.42 | 50 | 0 |
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| 1961 | 60.6 | 91 | 70.7 | 89 | 50.5 | 91 | 13.93 | 7 | 0 |
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| 1960 | 62.6 | 54 | 72.8 | 50 | 52.5 | 52 | 4.16 | 78 | 0 |
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| 1959 | 60.2 | 97 | 69 | 120 | 51.3 | 78 | 6.55 | 30 | 0 |
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| 1958 | 60.2 | 97 | 70.8 | 87 | 49.5 | 104 | 4.58 | 67 | 0 |
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| 1957 | 57.9 | 132 | 69 | 120 | 46.9 | 141 | 1.33 | 144 | 0 |
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| 1956 | 58.3 | 127 | 70.7 | 89 | 45.9 | 148 | 1.78 | 136 | 0 |
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| 1955 | 62.7 | 52 | 74.6 | 21 | 50.8 | 86 | 4.92 | 57 | 0 |
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| 1954 | 62.3 | 58 | 72.5 | 56 | 52.2 | 61 | 6.43 | 33 | 0 |
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| 1953 | 60.8 | 86 | 74.2 | 30 | 47.4 | 136 | 1.23 | 146 | 0 |
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| 1952 | 57.3 | 145 | 70.4 | 95 | 44.3 | 151 | 0.85 | 149 | 0 |
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| 1951 | 57.9 | 132 | 68.3 | 130 | 47.4 | 136 | 4.24 | 75 | 0 |
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| 1950 | 61.7 | 70 | 71.7 | 70 | 51.7 | 68 | 2.99 | 102 | 0 |
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| 1949 | 60.7 | 88 | 70.7 | 89 | 50.6 | 90 | 2.49 | 117 | 0 |
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| 1948 | 64.2 | 26 | 74.4 | 24 | 54.1 | 30 | 3.57 | 89 | 0 |
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| 1947 | 66 | 6 | 76.3 | 7 | 55.7 | 7 | 2.42 | 120 | 0 |
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| 1946 | 63.5 | 34 | 74.1 | 34 | 52.9 | 47 | 9.44 | 13 | 0 |
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| 1945 | 59.9 | 104 | 69.2 | 118 | 50.7 | 87 | 7.41 | 24 | 0 |
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| 1944 | 62.8 | 47 | 70.8 | 87 | 54.8 | 18 | 4.00 | 80 | 0 |
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| 1943 | 59.8 | 106 | 69.9 | 104 | 49.6 | 101 | 1.86 | 133 | 0 |
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| 1942 | 61.3 | 81 | 70.2 | 96 | 52.4 | 55 | 4.50 | 69 | 0 |
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| 1941 | 65 | 12 | 74.7 | 20 | 55.3 | 10 | 9.82 | 10 | 0 |
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| 1940 | 63.4 | 37 | 74.2 | 30 | 52.6 | 51 | 2.48 | 118 | 0 |
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| 1939 | 67.2 | 3 | 78.9 | 2 | 55.4 | 9 | 1.08 | 148 | 0 |
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| 1938 | 64.7 | 16 | 74.2 | 30 | 55.3 | 10 | 9.10 | 17 | 0 |
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| 1937 | 63 | 44 | 73.7 | 37 | 52.3 | 58 | 2.68 | 108 | 0 |
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| 1936 | 63.7 | 33 | 72.8 | 50 | 54.7 | 20 | 5.97 | 41 | 0 |
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| 1935 | 59.9 | 104 | 69.8 | 107 | 50 | 98 | 2.79 | 104 | 0 |
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| 1934 | 61.4 | 77 | 71 | 82 | 51.9 | 65 | 6.54 | 31 | 0 |
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| 1933 | 64.5 | 19 | 74.6 | 21 | 54.4 | 25 | 3.63 | 87 | 0 |
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| 1932 | 59.4 | 110 | 70.1 | 97 | 48.7 | 118 | 2.85 | 103 | 0 |
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| 1931 | 68.5 | 1 | 77.5 | 4 | 59.5 | 1 | 7.96 | 21 | 0 |
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| 1930 | 64.5 | 19 | 74.8 | 19 | 54.3 | 27 | 3.98 | 81 | 0 |
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| 1929 | 59.8 | 106 | 69.4 | 113 | 50.2 | 97 | 1.72 | 137 | 0 |
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| 1928 | 60.2 | 97 | 70.9 | 85 | 49.6 | 101 | 2.24 | 123 | 0 |
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| 1927 | 63.5 | 34 | 72.7 | 52 | 54.4 | 25 | 14.26 | 5 | 0 |
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| 1926 | 61.7 | 70 | 69 | 120 | 54.3 | 27 | 6.74 | 28 | 0 |
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| 1925 | 63.2 | 40 | 71.7 | 70 | 54.7 | 20 | 5.53 | 49 | 0 |
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| 1924 | 58.4 | 126 | 67.5 | 140 | 49.3 | 107 | 2.61 | 110 | 0 |
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| 1923 | 60.5 | 93 | 69.8 | 107 | 51.2 | 80 | 5.04 | 53 | 0 |
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| 1922 | 64.8 | 14 | 75.3 | 16 | 54.3 | 27 | 3.47 | 90 | 0 |
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| 1921 | 62.9 | 45 | 72.4 | 58 | 53.4 | 40 | 9.42 | 14 | 0 |
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| 1920 | 64.6 | 18 | 75.5 | 14 | 53.7 | 35 | 1.46 | 142 | 0 |
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| 1919 | 65.5 | 8 | 74.9 | 18 | 56.1 | 6 | 9.34 | 16 | 0 |
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| 1918 | 57.2 | 146 | 67.3 | 143 | 47.2 | 139 | 1.89 | 132 | 0 |
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| 1917 | 58.5 | 122 | 67.8 | 135 | 49.1 | 112 | 2.51 | 115 | 0 |
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| 1916 | 61.7 | 70 | 72 | 66 | 51.3 | 78 | 6.29 | 34 | 0 |
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| 1915 | 60.9 | 84 | 70 | 99 | 51.8 | 66 | 9.73 | 11 | 0 |
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| 1914 | 64.5 | 19 | 73.8 | 36 | 55.1 | 15 | 5.27 | 52 | 0 |
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| 1913 | 63.5 | 34 | 73.3 | 44 | 53.8 | 32 | 4.81 | 63 | 0 |
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| 1912 | 62.2 | 61 | 71 | 82 | 53.3 | 41 | 6.16 | 36 | 0 |
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| 1911 | 61.4 | 77 | 70 | 99 | 52.7 | 50 | 4.48 | 70 | 0 |
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| 1910 | 61.8 | 65 | 71.3 | 77 | 52.3 | 58 | 3.32 | 94 | 0 |
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| 1909 | 61.8 | 65 | 72 | 66 | 51.6 | 71 | 4.95 | 55 | 0 |
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| 1908 | 64 | 30 | 75.7 | 13 | 52.4 | 55 | 1.34 | 143 | 0 |
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| 1907 | 60.4 | 95 | 69.5 | 112 | 51.4 | 75 | 6.60 | 29 | 0 |
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| 1906 | 64.3 | 24 | 74.5 | 23 | 54.1 | 30 | 1.80 | 134 | 0 |
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| 1905 | 66.5 | 5 | 75.8 | 10 | 57.3 | 3 | 1.67 | 138 | 0 |
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| 1904 | 62.8 | 47 | 72.1 | 62 | 53.6 | 37 | 4.64 | 66 | 0 |
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| 1903 | 60.4 | 95 | 70 | 99 | 50.9 | 85 | 4.85 | 62 | 0 |
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| 1902 | 58.3 | 127 | 67.7 | 137 | 48.8 | 115 | 4.28 | 72 | 0 |
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| 1901 | 60.7 | 88 | 70.1 | 97 | 51.2 | 80 | 4.28 | 72 | 0 |
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| 1900 | 64.8 | 14 | 74.3 | 25 | 55.3 | 10 | 3.75 | 85 | 0 |
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| 1899 | 61.2 | 82 | 72.1 | 62 | 50.4 | 93 | 1.18 | 147 | 0 |
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| 1898 | 64.3 | 24 | 73.7 | 37 | 55 | 17 | 3.83 | 84 | 0 |
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| 1897 | 68 | 2 | 79.8 | 1 | 56.2 | 5 | 3.20 | 99 | 0 |
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| 1896 | 57.6 | 142 | 66.9 | 144 | 48.3 | 123 | 5.95 | 42 | 0 |
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| 1895 | 65.5 | 8 | 75.9 | 9 | 55.2 | 13 | 2.71 | 106 | 0 |
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| 1894 | 62.6 | 54 | 73.5 | 42 | 51.7 | 68 | 3.46 | 91 | 0 |
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| 1893 | 62.8 | 47 | 74.3 | 25 | 51.4 | 75 | 4.18 | 77 | 0 |
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| 1892 | 63.1 | 42 | 72.6 | 53 | 53.6 | 37 | 3.85 | 83 | 0 |
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| 1891 | 65.5 | 8 | 76.3 | 7 | 54.8 | 18 | 2.66 | 109 | 0 |
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| 1890 | 59.6 | 108 | 69.6 | 110 | 49.6 | 101 | 6.03 | 39 | 0 |
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| 1889 | 60.2 | 97 | 70.9 | 85 | 49.5 | 104 | 1.54 | 140 | 0 |
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| 1888 | 57.4 | 144 | 68.4 | 129 | 46.4 | 144 | 2.01 | 130 | 0 |
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| 1887 | 61.4 | 77 | 70.5 | 94 | 52.4 | 55 | 9.38 | 15 | 0 |
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| 1886 | 63.1 | 42 | 74 | 35 | 52.3 | 58 | 3.10 | 100 | 0 |
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| 1885 | 59.1 | 113 | 68.3 | 130 | 49.9 | 99 | 4.92 | 57 | 0 |
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| 1884 | 67.1 | 4 | 76.7 | 5 | 57.5 | 2 | 7.23 | 25 | 0 |
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| 1883 | 57.8 | 137 | 68.2 | 133 | 47.5 | 133 | 4.57 | 68 | 0 |
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| 1882 | 61.8 | 65 | 71.6 | 73 | 52 | 64 | 5.64 | 47 | 0 |
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| 1881 | 65.5 | 8 | 75.5 | 14 | 55.6 | 8 | 10.87 | 8 | 0 |
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| 1880 | 60.9 | 84 | 70.7 | 89 | 51.2 | 80 | 6.87 | 27 | 0 |
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| 1879 | 62.9 | 45 | 72.2 | 61 | 53.7 | 35 | 3.25 | 97 | 0 |
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| 1878 | 62.8 | 47 | 72.5 | 56 | 53.1 | 43 | 8.35 | 18 | 0 |
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| 1877 | 63.4 | 37 | 73 | 46 | 53.8 | 32 | 2.71 | 106 | 0 |
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| 1876 | 57.8 | 137 | 66.1 | 151 | 49.5 | 104 | 6.05 | 38 | 0 |
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| 1875 | 57 | 147 | 66.4 | 148 | 47.5 | 133 | 8.29 | 19 | 0 |
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| 1874 | 62.2 | 61 | 71.4 | 76 | 52.9 | 47 | 7.94 | 22 | 0 |
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| 1873 | | | | | | | 2.41 | 121 | 40 |
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