Every 1 September to 10 October in Westfield, MA from 1926 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 | 61.6 | 18 | 72.3 | 23 | 51 | 16 | 4.17 | 50 | 1 |
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| 2025 | | | | | | | | | 10 |
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| 2024 | 62.8 | 15 | 75.3 | 7 | 50.4 | 19 | 0.86 | 85 | 0 |
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| 2023 | 64 | 7 | 74.7 | 10 | 53.4 | 8 | 8.48 | 13 | 0 |
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| 2022 | 60.6 | 27 | 71.3 | 29 | 49.9 | 21 | 7.30 | 22 | 0 |
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| 2021 | 63.8 | 9 | 74.1 | 13 | 53.6 | 7 | 7.91 | 18 | 0 |
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| 2020 | 61.5 | 19 | 74 | 14 | 49 | 26 | 3.75 | 55 | 0 |
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| 2019 | 61.1 | 23 | 73.4 | 18 | 48.8 | 27 | 2.93 | 68 | 0 |
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| 2018 | 65.2 | 3 | 74 | 14 | 56.4 | 1 | 12.19 | 4 | 0 |
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| 2017 | 65.3 | 2 | 77 | 2 | 53.7 | 6 | 2.91 | 69 | 0 |
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| 2016 | 63.1 | 11 | 74.9 | 8 | 51.3 | 14 | 2.77 | 70 | 0 |
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| 2015 | 64 | 7 | 76.4 | 5 | 51.5 | 13 | 5.12 | 37 | 0 |
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| 2014 | 61.5 | 19 | 73.5 | 16 | 49.6 | 23 | 2.57 | 74 | 0 |
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| 2013 | 60.7 | 26 | 73.2 | 19 | 48.3 | 29 | 3.89 | 52 | 0 |
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| 2012 | 61.3 | 21 | 72.1 | 25 | 50.6 | 18 | 6.66 | 27 | 0 |
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| 2011 | 64.4 | 4 | 74.4 | 11 | 54.4 | 5 | 9.19 | 10 | 0 |
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| 2010 | 63.7 | 10 | 75.5 | 6 | 52 | 11 | 6.63 | 28 | 0 |
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| 2009 | 58.7 | 34 | 70.1 | 33 | 47.2 | 33 | 3.36 | 61 | 2 |
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| 2008 | 60.6 | 27 | 71.9 | 26 | 49.3 | 24 | 8.71 | 12 | 0 |
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| 2007 | 64.1 | 6 | 77.1 | 1 | 51.2 | 15 | 2.62 | 72 | 0 |
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| 2006 | 59.5 | 32 | 71.2 | 30 | 47.8 | 31 | 5.13 | 36 | 0 |
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| 2005 | 64.3 | 5 | 76.6 | 3 | 52.1 | 10 | 9.97 | 9 | 0 |
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| 2004 | 61.2 | 22 | 73 | 21 | 49.3 | 24 | 8.38 | 14 | 0 |
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| 2003 | 59 | 33 | 69.9 | 34 | 48.2 | 30 | 12.30 | 3 | 0 |
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| 2002 | 62.9 | 13 | 74.8 | 9 | 50.9 | 17 | 3.48 | 59 | 0 |
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| 2001 | 59.6 | 31 | 73.5 | 16 | 45.8 | 34 | 3.98 | 51 | 0 |
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| 2000 | 57.3 | 35 | 69.5 | 35 | 45.1 | 35 | 3.87 | 53 | 0 |
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| 1999 | 60.8 | 25 | 71.8 | 27 | 49.8 | 22 | 15.14 | 1 | 0 |
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| 1998 | 60.3 | 29 | 73.1 | 20 | 47.6 | 32 | 4.61 | 44 | 0 |
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| 1993 | | | | | | | 5.97 | 30 | 40 |
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| 1992 | | | | | | | 3.10 | 65 | 40 |
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| 1991 | | | | | | | 8.75 | 11 | 40 |
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| 1990 | | | | | | | 1.34 | 83 | 40 |
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| 1989 | | | | | | | 6.89 | 26 | 40 |
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| 1987 | | | | | | | 10.59 | 6 | 40 |
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| 1986 | | | | | | | 3.02 | 67 | 40 |
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| 1985 | | | | | | | 7.72 | 19 | 40 |
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| 1984 | | | | | | | 3.06 | 66 | 40 |
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| 1983 | | | | | | | 3.67 | 57 | 40 |
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| 1982 | | | | | | | 4.67 | 42 | 40 |
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| 1981 | | | | | | | 4.42 | 47 | 40 |
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| 1980 | | | | | | | 2.27 | 76 | 40 |
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| 1979 | | | | | | | 8.37 | 15 | 40 |
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| 1978 | | | | | | | 3.34 | 62 | 40 |
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| 1977 | | | | | | | 10.04 | 8 | 40 |
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| 1976 | | | | | | | 3.22 | 63 | 40 |
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| 1975 | | | | | | | 10.62 | 5 | 40 |
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| 1974 | | | | | | | 7.00 | 25 | 40 |
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| 1973 | | | | | | | 2.60 | 73 | 15 |
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| 1972 | | | | | | | 4.50 | 46 | 40 |
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| 1971 | | | | | | | 3.73 | 56 | 40 |
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| 1970 | | | | | | | 3.56 | 58 | 40 |
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| 1969 | | | | | | | 4.53 | 45 | 40 |
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| 1968 | | | | | | | 4.67 | 42 | 40 |
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| 1967 | | | | | | | 1.71 | 79 | 40 |
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| 1966 | | | | | | | 7.05 | 24 | 40 |
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| 1964 | | | | | | | 1.53 | 82 | 40 |
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| 1963 | | | | | | | 3.87 | 53 | 40 |
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| 1962 | | | | | | | 6.43 | 29 | 40 |
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| 1961 | | | | | | | 5.02 | 39 | 40 |
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| 1960 | | | | | | | 8.31 | 16 | 40 |
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| 1959 | | | | | | | 5.90 | 32 | 40 |
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| 1958 | | | | | | | 7.34 | 21 | 40 |
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| 1957 | | | | | | | 3.18 | 64 | 40 |
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| 1956 | | | | | | | 7.10 | 23 | 40 |
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| 1955 | | | | | | | 5.95 | 31 | 40 |
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| 1954 | | | | | | | 10.38 | 7 | 40 |
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| 1953 | | | | | | | 2.32 | 75 | 40 |
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| 1952 | | | | | | | 4.90 | 40 | 40 |
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| 1951 | | | | | | | 5.51 | 34 | 40 |
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| 1950 | | | | | | | 2.23 | 77 | 40 |
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| 1949 | | | | | | | 4.29 | 48 | 40 |
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| 1948 | | | | | | | 2.09 | 78 | 40 |
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| 1947 | | | | | | | 4.71 | 41 | 40 |
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| 1946 | | | | | | | 4.21 | 49 | 40 |
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| 1945 | | | | | | | 3.45 | 60 | 40 |
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| 1944 | | | | | | | 7.46 | 20 | 40 |
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| 1942 | | | | | | | 5.33 | 35 | 40 |
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| 1941 | | | | | | | 1.66 | 80 | 40 |
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| 1934 | 62.8 | 15 | 70.9 | 32 | 54.6 | 4 | 13.33 | 2 | 0 |
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| 1933 | 63 | 12 | 71.2 | 30 | 54.8 | 3 | 8.19 | 17 | 0 |
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| 1932 | 62.6 | 17 | 72.6 | 22 | 52.7 | 9 | 5.58 | 33 | 0 |
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| 1931 | 65.8 | 1 | 76.5 | 4 | 55 | 2 | 0.91 | 84 | 0 |
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| 1930 | 62.9 | 13 | 74.3 | 12 | 51.6 | 12 | 1.59 | 81 | 0 |
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| 1929 | 60.3 | 29 | 72.3 | 23 | 48.4 | 28 | 5.11 | 38 | 2 |
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| 1928 | | | | | | | | | 13 |
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| 1927 | 61.1 | 23 | 71.7 | 28 | 50.4 | 19 | | | 2 |
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| 1926 | | | 68.6 | 36 | | | 2.67 | 71 | 5 |
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