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compiled a ranking of the coldest Decembers 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. December 1972
- Average temperature: 14°F
- Monthly high temperature: 24.1°F
- Monthly low temperature: 4°F
- Total precipitation: 1.36"

#9. December 1924
- Average temperature: 13.7°F
- Monthly high temperature: 23.7°F
- Monthly low temperature: 3.6°F
- Total precipitation: 1.41"

#7. December 1927 (tie)
- Average temperature: 12.8°F
- Monthly high temperature: 23.8°F
- Monthly low temperature: 1.8°F
- Total precipitation: 1.11"

#7. December 1914 (tie)
- Average temperature: 12.8°F
- Monthly high temperature: 24.2°F
- Monthly low temperature: 1.5°F
- Total precipitation: 0.4"

#6. December 1990
- Average temperature: 12.7°F
- Monthly high temperature: 24.6°F
- Monthly low temperature: 0.9°F
- Total precipitation: 0.82"

#5. December 1916
- Average temperature: 12.6°F
- Monthly high temperature: 21.7°F
- Monthly low temperature: 3.4°F
- Total precipitation: 1.38"

#4. December 1932
- Average temperature: 11.2°F
- Monthly high temperature: 21.6°F
- Monthly low temperature: 0.8°F
- Total precipitation: 1.09"

#3. December 1978
- Average temperature: 11°F
- Monthly high temperature: 21.5°F
- Monthly low temperature: 0.5°F
- Total precipitation: 1.8"

#1. December 1983 (tie)
- Average temperature: 9.1°F
- Monthly high temperature: 18.9°F
- Monthly low temperature: -0.7°F
- Total precipitation: 1.59"

#1. December 1909 (tie)
- Average temperature: 9.1°F
- Monthly high temperature: 18.4°F
- Monthly low temperature: -0.1°F
- Total precipitation: 1.57"