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compiled a ranking of the coldest Septembers in Montana since 1895 using data from the . Rankings are based on the lowest average temperature in each month. For each of the coldest months listed below, we've included the average state temperature, state-wide highs and lows for the month, and the total precipitation.

#9. September 1929 (tie)
- Average temperature: 49.4°F
- Monthly high temperature: 61.9°F
- Monthly low temperature: 36.9°F
- Total precipitation: 1.54"

#9. September 1896 (tie)
- Average temperature: 49.4°F
- Monthly high temperature: 61.9°F
- Monthly low temperature: 37°F
- Total precipitation: 2.3"

#8. September 1984
- Average temperature: 49.1°F
- Monthly high temperature: 61.6°F
- Monthly low temperature: 36.5°F
- Total precipitation: 1.61"

#7. September 1986
- Average temperature: 48.9°F
- Monthly high temperature: 57.9°F
- Monthly low temperature: 39.9°F
- Total precipitation: 3.94"

#6. September 1901
- Average temperature: 48.7°F
- Monthly high temperature: 59°F
- Monthly low temperature: 38.3°F
- Total precipitation: 2.18"

#5. September 1961
- Average temperature: 48.1°F
- Monthly high temperature: 59.9°F
- Monthly low temperature: 36.2°F
- Total precipitation: 2.8"

#4. September 1985
- Average temperature: 47.8°F
- Monthly high temperature: 57.9°F
- Monthly low temperature: 37.8°F
- Total precipitation: 3.09"

#3. September 1912
- Average temperature: 47°F
- Monthly high temperature: 58.4°F
- Monthly low temperature: 35.6°F
- Total precipitation: 1.9"

#2. September 1926
- Average temperature: 46.7°F
- Monthly high temperature: 58.4°F
- Monthly low temperature: 35.1°F
- Total precipitation: 2.59"

#1. September 1965
- Average temperature: 43.6°F
- Monthly high temperature: 53.4°F
- Monthly low temperature: 33.8°F
- Total precipitation: 2.38"