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compiled a ranking of the coldest Decembers in Illinois 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.

#9. December 1919 (tie)
- Average temperature: 22.6°F
- Monthly high temperature: 30.9°F
- Monthly low temperature: 14.2°F
- Total precipitation: 0.72"

#9. December 1914 (tie)
- Average temperature: 22.6°F
- Monthly high temperature: 30°F
- Monthly low temperature: 15.2°F
- Total precipitation: 2.36"

#8. December 1950
- Average temperature: 21.5°F
- Monthly high temperature: 30.4°F
- Monthly low temperature: 12.7°F
- Total precipitation: 1.4"

#7. December 1985
- Average temperature: 20.9°F
- Monthly high temperature: 30.4°F
- Monthly low temperature: 11.5°F
- Total precipitation: 2.31"

#6. December 1917
- Average temperature: 20.6°F
- Monthly high temperature: 29.3°F
- Monthly low temperature: 11.9°F
- Total precipitation: 0.85"

#5. December 1909
- Average temperature: 20.2°F
- Monthly high temperature: 28.1°F
- Monthly low temperature: 12.3°F
- Total precipitation: 3.03"

#3. December 1989 (tie)
- Average temperature: 18°F
- Monthly high temperature: 27.6°F
- Monthly low temperature: 8.4°F
- Total precipitation: 0.85"

#3. December 1963 (tie)
- Average temperature: 18°F
- Monthly high temperature: 27°F
- Monthly low temperature: 9°F
- Total precipitation: 0.87"

#2. December 2000
- Average temperature: 17.6°F
- Monthly high temperature: 25.9°F
- Monthly low temperature: 9.3°F
- Total precipitation: 1.94"

#1. December 1983
- Average temperature: 17.3°F
- Monthly high temperature: 24.3°F
- Monthly low temperature: 10.3°F
- Total precipitation: 3.46"