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compiled a ranking of the coldest Septembers in Wyoming 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.

#10. September 1970 (tie)
- Average temperature: 50.1°F
- Monthly high temperature: 64.6°F
- Monthly low temperature: 35.6°F
- Total precipitation: 1.35"

#10. September 1934 (tie)
- Average temperature: 50.1°F
- Monthly high temperature: 64.9°F
- Monthly low temperature: 35.3°F
- Total precipitation: 1.09"

#8. September 1986 (tie)
- Average temperature: 49.9°F
- Monthly high temperature: 61.7°F
- Monthly low temperature: 38°F
- Total precipitation: 2.12"

#8. September 1971 (tie)
- Average temperature: 49.9°F
- Monthly high temperature: 64°F
- Monthly low temperature: 35.7°F
- Total precipitation: 1.52"

#6. September 1929 (tie)
- Average temperature: 49.6°F
- Monthly high temperature: 61.4°F
- Monthly low temperature: 37.8°F
- Total precipitation: 2.11"

#6. September 1903 (tie)
- Average temperature: 49.6°F
- Monthly high temperature: 63°F
- Monthly low temperature: 36.1°F
- Total precipitation: 1.65"

#5. September 1926
- Average temperature: 49.5°F
- Monthly high temperature: 64.4°F
- Monthly low temperature: 34.6°F
- Total precipitation: 1.44"

#4. September 1985
- Average temperature: 49.3°F
- Monthly high temperature: 62.3°F
- Monthly low temperature: 36.4°F
- Total precipitation: 1.91"

#3. September 1961
- Average temperature: 47.7°F
- Monthly high temperature: 59.9°F
- Monthly low temperature: 35.6°F
- Total precipitation: 2.71"

#2. September 1912
- Average temperature: 45.4°F
- Monthly high temperature: 56.3°F
- Monthly low temperature: 34.5°F
- Total precipitation: 2.23"

#1. September 1965
- Average temperature: 44.6°F
- Monthly high temperature: 56.2°F
- Monthly low temperature: 33°F
- Total precipitation: 2.21"