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compiled a ranking of the coldest Decembers in Idaho 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 1909
- Average temperature: 17.4°F
- Monthly high temperature: 24.2°F
- Monthly low temperature: 10.5°F
- Total precipitation: 2.73"

#9. December 1983
- Average temperature: 17.3°F
- Monthly high temperature: 24.4°F
- Monthly low temperature: 10.2°F
- Total precipitation: 4.34"

#8. December 1948
- Average temperature: 16.9°F
- Monthly high temperature: 25.3°F
- Monthly low temperature: 8.5°F
- Total precipitation: 3.92"

#7. December 1930
- Average temperature: 16.8°F
- Monthly high temperature: 25.8°F
- Monthly low temperature: 7.8°F
- Total precipitation: 0.89"

#5. December 1932 (tie)
- Average temperature: 16.5°F
- Monthly high temperature: 25.8°F
- Monthly low temperature: 7.2°F
- Total precipitation: 2.6"

#5. December 1914 (tie)
- Average temperature: 16.5°F
- Monthly high temperature: 26.3°F
- Monthly low temperature: 6.7°F
- Total precipitation: 1.02"

#4. December 1919
- Average temperature: 16.3°F
- Monthly high temperature: 25.6°F
- Monthly low temperature: 6.9°F
- Total precipitation: 2.43"

#3. December 1924
- Average temperature: 15.9°F
- Monthly high temperature: 24.4°F
- Monthly low temperature: 7.5°F
- Total precipitation: 3.08"

#2. December 1985
- Average temperature: 15.7°F
- Monthly high temperature: 24.4°F
- Monthly low temperature: 7°F
- Total precipitation: 1.33"

#1. December 1990
- Average temperature: 14.5°F
- Monthly high temperature: 24.1°F
- Monthly low temperature: 4.9°F
- Total precipitation: 2.02"