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compiled a ranking of the coldest Decembers in Washington 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: 24.8°F
- Monthly high temperature: 29.9°F
- Monthly low temperature: 19.7°F
- Total precipitation: 4.52"

#8. December 1924 (tie)
- Average temperature: 24.6°F
- Monthly high temperature: 31°F
- Monthly low temperature: 18.1°F
- Total precipitation: 5.82"

#8. December 1914 (tie)
- Average temperature: 24.6°F
- Monthly high temperature: 31.2°F
- Monthly low temperature: 18.1°F
- Total precipitation: 2.14"

#6. December 1984 (tie)
- Average temperature: 24.5°F
- Monthly high temperature: 30.7°F
- Monthly low temperature: 18.3°F
- Total precipitation: 5.03"

#6. December 1948 (tie)
- Average temperature: 24.5°F
- Monthly high temperature: 30.8°F
- Monthly low temperature: 18.2°F
- Total precipitation: 8.08"

#5. December 1922
- Average temperature: 24.4°F
- Monthly high temperature: 30.1°F
- Monthly low temperature: 18.6°F
- Total precipitation: 7.81"

#4. December 1990
- Average temperature: 24.2°F
- Monthly high temperature: 30.5°F
- Monthly low temperature: 17.9°F
- Total precipitation: 5.42"

#3. December 1985
- Average temperature: 23.9°F
- Monthly high temperature: 29.4°F
- Monthly low temperature: 18.4°F
- Total precipitation: 1.78"

#2. December 1919
- Average temperature: 23.7°F
- Monthly high temperature: 30.2°F
- Monthly low temperature: 17.3°F
- Total precipitation: 4.6"

#1. December 1983
- Average temperature: 22.7°F
- Monthly high temperature: 28.3°F
- Monthly low temperature: 17.1°F
- Total precipitation: 4.99"