Every August in Glasgow, MT from 1894 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 | 70.5 | 49 | 84.5 | 69 | 56.4 | 38 | 0.64 | 80 | 0 |
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| 2025 | 71.4 | 35 | 84.9 | 62 | 57.9 | 16 | 1.03 | 54 | 0 |
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| 2024 | 72.7 | 20 | 86.4 | 41 | 59 | 10 | 1.23 | 45 | 0 |
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| 2023 | 73.9 | 9 | 88.6 | 25 | 59.2 | 9 | 0.53 | 86 | 0 |
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| 2022 | 77 | 2 | 92.3 | 2 | 61.8 | 1 | 0.29 | 103 | 0 |
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| 2021 | 71.2 | 37 | 84.5 | 69 | 57.9 | 16 | 1.82 | 31 | 0 |
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| 2020 | 73.3 | 13 | 90.1 | 11 | 56.5 | 35 | 0.29 | 103 | 0 |
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| 2019 | 70.2 | 56 | 82.8 | 90 | 57.7 | 18 | 2.74 | 16 | 0 |
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| 2018 | 71.5 | 33 | 86.1 | 45 | 57 | 27 | 0.56 | 84 | 0 |
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| 2017 | 69.4 | 72 | 84.4 | 74 | 54.5 | 68 | 0.28 | 105 | 0 |
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| 2016 | 69 | 79 | 83.3 | 87 | 54.7 | 66 | 0.52 | 87 | 0 |
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| 2015 | 70.3 | 54 | 85.9 | 47 | 54.8 | 64 | 0.84 | 72 | 0 |
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| 2014 | 69.7 | 67 | 82.2 | 98 | 57.2 | 19 | 6.72 | 1 | 0 |
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| 2013 | 72.5 | 23 | 86.9 | 37 | 58.1 | 13 | 0.18 | 113 | 0 |
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| 2012 | 71 | 39 | 87.1 | 36 | 55 | 57 | 0.76 | 76 | 0 |
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| 2011 | 71.8 | 30 | 86.3 | 44 | 57.2 | 19 | 0.91 | 61 | 0 |
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| 2010 | 69.7 | 67 | 83.5 | 85 | 55.9 | 42 | 2.99 | 13 | 0 |
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| 2009 | 67.6 | 96 | 81.6 | 104 | 53.7 | 76 | 2.21 | 24 | 0 |
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| 2008 | 70.6 | 45 | 86.1 | 45 | 55 | 57 | 0.71 | 78 | 0 |
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| 2007 | 70.4 | 52 | 84.2 | 77 | 56.6 | 31 | 0.23 | 108 | 0 |
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| 2006 | 71.7 | 32 | 86.7 | 39 | 56.6 | 31 | 0.48 | 90 | 0 |
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| 2005 | 68.6 | 85 | 83.9 | 81 | 53.3 | 83 | 0.88 | 64 | 0 |
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| 2004 | 64.6 | 120 | 77.6 | 121 | 51.5 | 106 | 1.07 | 53 | 0 |
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| 2003 | 76 | 4 | 90.6 | 6 | 61.5 | 3 | 0.86 | 68 | 0 |
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| 2002 | 65.4 | 112 | 77.5 | 122 | 53.2 | 87 | 2.58 | 20 | 0 |
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| 2001 | 72.9 | 17 | 88.7 | 24 | 57.1 | 23 | trace | 128 | 0 |
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| 2000 | 70.6 | 45 | 85.9 | 47 | 55.3 | 51 | 0.26 | 106 | 0 |
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| 1999 | 70.9 | 41 | 84.5 | 69 | 57.2 | 19 | 1.26 | 43 | 0 |
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| 1998 | 74.7 | 7 | 90.1 | 11 | 59.4 | 8 | 0.48 | 90 | 0 |
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| 1997 | 69.9 | 64 | 84.7 | 64 | 55 | 57 | 2.63 | 19 | 0 |
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| 1996 | 72.6 | 21 | 89.2 | 19 | 55.9 | 42 | 0.09 | 121 | 0 |
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| 1995 | 69.9 | 64 | 84.5 | 69 | 55.2 | 53 | 0.95 | 57 | 0 |
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| 1994 | 70.6 | 45 | 84.7 | 64 | 56.6 | 31 | 0.86 | 68 | 0 |
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| 1993 | 64.5 | 122 | 76.1 | 125 | 52.9 | 90 | 4.31 | 7 | 0 |
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| 1992 | 66.2 | 104 | 80.3 | 112 | 52 | 97 | 0.90 | 62 | 0 |
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| 1991 | 75 | 5 | 89.5 | 16 | 60.5 | 5 | 0.49 | 89 | 0 |
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| 1990 | 72 | 27 | 85.9 | 47 | 58.1 | 13 | 1.45 | 35 | 0 |
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| 1989 | 70.2 | 56 | 83.2 | 88 | 57.1 | 23 | 1.48 | 33 | 0 |
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| 1988 | 70.4 | 52 | 85.4 | 58 | 55.5 | 49 | 0.47 | 92 | 0 |
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| 1987 | 64.5 | 122 | 77.1 | 123 | 52 | 97 | 0.88 | 64 | 0 |
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| 1986 | 69.4 | 72 | 84 | 79 | 54.7 | 66 | 0.83 | 74 | 0 |
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| 1985 | 64.5 | 122 | 76.1 | 125 | 53 | 88 | 5.74 | 2 | 0 |
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| 1984 | 74.4 | 8 | 88.3 | 28 | 60.5 | 5 | 0.43 | 93 | 0 |
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| 1983 | 76.5 | 3 | 91.3 | 4 | 61.7 | 2 | 0.03 | 127 | 0 |
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| 1982 | 69.3 | 75 | 83.6 | 84 | 55 | 57 | 1.19 | 47 | 0 |
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| 1981 | 73.1 | 16 | 87.9 | 29 | 58.3 | 12 | 0.23 | 108 | 0 |
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| 1980 | 64.6 | 120 | 77.9 | 120 | 51.4 | 107 | 1.36 | 40 | 0 |
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| 1979 | 69.6 | 69 | 82.8 | 90 | 56.5 | 35 | 0.76 | 76 | 0 |
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| 1978 | 65.9 | 107 | 80.1 | 113 | 51.7 | 101 | 0.16 | 116 | 0 |
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| 1977 | 61.2 | 129 | 74.2 | 129 | 48.1 | 127 | 0.58 | 82 | 0 |
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| 1976 | 70 | 62 | 83.9 | 81 | 56 | 40 | 1.16 | 48 | 0 |
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| 1975 | 64.9 | 119 | 78.7 | 116 | 51.1 | 110 | 1.37 | 39 | 0 |
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| 1974 | 63.9 | 126 | 76 | 127 | 51.9 | 99 | 2.69 | 18 | 0 |
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| 1973 | 72.9 | 17 | 87.3 | 33 | 58.5 | 11 | 1.21 | 46 | 0 |
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| 1972 | 71 | 39 | 84.9 | 62 | 57.2 | 19 | 2.40 | 21 | 0 |
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| 1971 | 77.1 | 1 | 92.8 | 1 | 61.5 | 3 | 0.78 | 75 | 0 |
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| 1970 | 72.1 | 25 | 88.8 | 23 | 55.5 | 49 | 0.04 | 126 | 0 |
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| 1969 | 73.4 | 12 | 89.7 | 14 | 57.1 | 23 | 0.05 | 125 | 0 |
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| 1968 | 65 | 116 | 78.3 | 119 | 51.7 | 101 | 2.00 | 27 | 0 |
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| 1967 | 70.5 | 49 | 85.7 | 53 | 55.3 | 51 | 0.18 | 113 | 0 |
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| 1966 | 65.4 | 112 | 78.4 | 118 | 52.4 | 95 | 3.65 | 9 | 0 |
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| 1965 | 69.4 | 72 | 81.7 | 103 | 57 | 27 | 3.01 | 12 | 0 |
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| 1964 | 67.9 | 91 | 82.4 | 93 | 53.5 | 79 | 0.85 | 70 | 0 |
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| 1963 | 70.8 | 43 | 84.7 | 64 | 56.9 | 29 | 3.30 | 10 | 0 |
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| 1962 | 68.5 | 89 | 81.3 | 106 | 55.6 | 48 | 1.87 | 30 | 0 |
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| 1961 | 75 | 5 | 90.1 | 11 | 59.8 | 7 | 0.38 | 97 | 0 |
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| 1960 | 68.6 | 85 | 82.3 | 96 | 54.9 | 62 | 0.95 | 57 | 0 |
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| 1959 | 69 | 79 | 83 | 89 | 55.1 | 55 | 0.59 | 81 | 0 |
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| 1958 | 72.6 | 21 | 87.3 | 33 | 58 | 15 | 0.52 | 87 | 0 |
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| 1957 | 69.2 | 76 | 81.8 | 102 | 56.6 | 31 | 2.01 | 26 | 0 |
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| 1956 | 67.1 | 99 | 80.7 | 108 | 53.5 | 79 | 2.03 | 25 | 0 |
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| 1955 | 73.3 | 13 | 90.3 | 9 | 56.3 | 39 | 0.09 | 121 | 0 |
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| 1954 | 68.8 | 84 | 81.9 | 100 | 55.7 | 47 | 4.88 | 6 | 0 |
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| 1953 | 71.4 | 35 | 86.8 | 38 | 55.9 | 42 | 0.98 | 56 | 0 |
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| 1952 | 68.9 | 82 | 84.2 | 77 | 53.5 | 79 | 1.39 | 37 | 0 |
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| 1951 | 66.5 | 102 | 79.9 | 114 | 53 | 88 | 1.43 | 36 | 0 |
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| 1950 | 65.4 | 112 | 80.5 | 110 | 50.2 | 117 | 2.27 | 23 | 0 |
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| 1949 | 73.8 | 10 | 90.6 | 6 | 56.9 | 29 | 0.69 | 79 | 0 |
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| 1948 | 72.8 | 19 | 89 | 20 | 56.5 | 35 | 0.88 | 64 | 0 |
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| 1947 | 70.9 | 41 | 85.9 | 47 | 55.9 | 42 | 5.55 | 3 | 0 |
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| 1946 | 67.9 | 91 | 83.5 | 85 | 52.3 | 96 | 0.36 | 100 | 0 |
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| 1945 | 69.6 | 69 | 85.6 | 54 | 53.6 | 77 | 0.42 | 94 | 0 |
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| 1944 | 67.2 | 98 | 80.7 | 108 | 53.6 | 77 | 2.79 | 15 | 0 |
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| 1943 | 70.5 | 49 | 85.8 | 52 | 55.2 | 53 | 1.47 | 34 | 0 |
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| 1942 | 67.9 | 91 | 84.3 | 76 | 51.6 | 104 | 0.85 | 70 | 0 |
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| 1941 | 70.2 | 56 | 84.6 | 67 | 55.9 | 42 | 1.90 | 29 | 0 |
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| 1940 | 71.1 | 38 | 88.9 | 22 | 53.3 | 83 | 0.10 | 120 | 0 |
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| 1939 | 68.6 | 85 | 86.4 | 41 | 50.8 | 113 | 1.30 | 41 | 0 |
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| 1938 | 68.9 | 82 | 87.3 | 33 | 50.5 | 115 | 1.08 | 52 | 0 |
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| 1937 | 71.9 | 29 | 90.4 | 8 | 53.3 | 83 | 0.11 | 118 | 0 |
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| 1936 | 72.2 | 24 | 88.5 | 26 | 56 | 40 | 0.84 | 72 | 0 |
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| 1935 | 67.9 | 91 | 84.6 | 67 | 51.3 | 108 | 0.42 | 94 | 0 |
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| 1934 | 69.6 | 69 | 87.7 | 30 | 51.6 | 104 | 0.19 | 112 | 0 |
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| 1933 | 70 | 62 | 86.5 | 40 | 53.5 | 79 | 5.28 | 4 | 0 |
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| 1932 | 70.3 | 54 | 85.6 | 54 | 55 | 57 | 2.74 | 16 | 0 |
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| 1931 | 69.8 | 66 | 86.4 | 41 | 53.3 | 83 | 0.38 | 97 | 0 |
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| 1930 | 73.6 | 11 | 90.2 | 10 | 57.1 | 23 | 0.20 | 111 | 0 |
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| 1929 | 72 | 27 | 91.5 | 3 | 52.5 | 94 | 0.87 | 67 | 0 |
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| 1928 | 65.8 | 109 | 82.4 | 93 | 49.2 | 121 | 1.09 | 51 | 0 |
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| 1927 | 67 | 100 | 84.4 | 74 | 49.9 | 118 | 1.39 | 37 | 1 |
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| 1926 | 68.6 | 85 | 85.5 | 57 | 51.8 | 100 | 1.66 | 32 | 0 |
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| 1925 | 70.2 | 56 | 89.4 | 17 | 51.1 | 110 | 0.09 | 121 | 0 |
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| 1924 | 65.9 | 107 | 82.5 | 92 | 49.3 | 120 | 3.10 | 11 | 0 |
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| 1923 | 65.3 | 115 | 81.6 | 104 | 49 | 122 | 1.16 | 48 | 0 |
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| 1922 | 72.1 | 25 | 89.4 | 17 | 54.9 | 62 | 2.37 | 22 | 0 |
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| 1921 | 71.5 | 33 | 89 | 20 | 53.9 | 73 | 0.07 | 124 | 0 |
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| 1920 | 71.8 | 30 | 89.6 | 15 | 54.1 | 72 | 1.27 | 42 | 0 |
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| 1919 | 70.6 | 45 | 87.4 | 32 | 53.9 | 73 | 0.89 | 63 | 0 |
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| 1918 | 69.1 | 77 | 84 | 79 | 54.2 | 70 | 4.26 | 8 | 0 |
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| 1917 | 67.4 | 97 | 84.5 | 69 | 50.3 | 116 | 0.32 | 101 | 0 |
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| 1916 | 65.8 | 109 | 82.1 | 99 | 49.5 | 119 | 0.95 | 57 | 0 |
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| 1915 | 70.2 | 56 | 85.6 | 54 | 54.8 | 64 | 0.58 | 82 | 0 |
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| 1914 | 66.8 | 101 | 82.4 | 93 | 51.3 | 108 | 2.99 | 13 | 0 |
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| 1913 | 69.1 | 77 | 85.4 | 58 | 52.8 | 92 | 1.11 | 50 | 0 |
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| 1912 | 63 | 128 | 74.4 | 128 | 51.7 | 101 | 5.12 | 5 | 0 |
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| 1911 | 63.9 | 126 | 79.3 | 115 | 48.6 | 125 | | | 0 |
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| 1907 | 65 | 116 | 81.9 | 100 | 48.1 | 127 | 1.97 | 28 | 0 |
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| 1906 | 66.2 | 104 | 78.5 | 117 | 53.9 | 73 | 1.26 | 43 | 1 |
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| 1905 | 70.2 | 56 | 85.9 | 47 | 54.5 | 68 | 0.18 | 113 | 0 |
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| 1904 | 64.2 | 125 | 80.5 | 110 | 47.8 | 129 | 0.42 | 94 | 0 |
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| 1903 | 65 | 116 | 77 | 124 | 52.9 | 90 | 1.02 | 55 | 0 |
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| 1902 | 67.9 | 91 | 85.2 | 60 | 50.6 | 114 | 0.32 | 101 | 0 |
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| 1900 | 69 | 79 | 85.2 | 60 | 52.7 | 93 | 0.93 | 60 | 0 |
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| 1899 | 66.1 | 106 | 81.2 | 107 | 51 | 112 | 0.25 | 107 | 0 |
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| 1898 | 70.8 | 43 | 87.5 | 31 | 54.2 | 70 | 0.11 | 118 | 0 |
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| 1897 | 68.3 | 90 | 88.5 | 26 | 48.2 | 126 | 0.12 | 117 | 0 |
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| 1896 | 65.5 | 111 | 82.3 | 96 | 48.7 | 123 | 0.22 | 110 | 0 |
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| 1895 | 66.3 | 103 | 83.9 | 81 | 48.7 | 123 | 0.54 | 85 | 0 |
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| 1894 | 73.2 | 15 | 91.3 | 4 | 55.1 | 55 | 0.37 | 99 | 0 |
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