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compiled a ranking of the coldest Decembers 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.

#10. December 1984
- Average temperature: 12.7°F
- Monthly high temperature: 22.9°F
- Monthly low temperature: 2.4°F
- Total precipitation: 1.43"

#9. December 1978
- Average temperature: 12.6°F
- Monthly high temperature: 21.7°F
- Monthly low temperature: 3.4°F
- Total precipitation: 1.53"

#8. December 1951
- Average temperature: 12.1°F
- Monthly high temperature: 21.5°F
- Monthly low temperature: 2.8°F
- Total precipitation: 2.17"

#7. December 2009
- Average temperature: 12°F
- Monthly high temperature: 21.4°F
- Monthly low temperature: 2.6°F
- Total precipitation: 1.05"

#6. December 1909
- Average temperature: 11.9°F
- Monthly high temperature: 20.1°F
- Monthly low temperature: 3.6°F
- Total precipitation: 1.38"

#5. December 1964
- Average temperature: 11.7°F
- Monthly high temperature: 20.8°F
- Monthly low temperature: 2.8°F
- Total precipitation: 2.92"

#4. December 1924
- Average temperature: 10.5°F
- Monthly high temperature: 20.1°F
- Monthly low temperature: 0.8°F
- Total precipitation: 1.59"

#3. December 1916
- Average temperature: 10.1°F
- Monthly high temperature: 19.2°F
- Monthly low temperature: 0.9°F
- Total precipitation: 1.71"

#2. December 1927
- Average temperature: 6.6°F
- Monthly high temperature: 16.6°F
- Monthly low temperature: -3.3°F
- Total precipitation: 1.82"

#1. December 1983
- Average temperature: 3.4°F
- Monthly high temperature: 12.9°F
- Monthly low temperature: -6.1°F
- Total precipitation: 1.26"