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31. Denver, Colorado
> High average December temperature, 1991-2020: 46°F
> Low average December temperature, 1991-2020: 18°F
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30. Seattle, Washington
> High average December temperature, 1991-2020: 47°F
> Low average December temperature, 1991-2020: 37°F
24/7 Tempo
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29. Louisville, Kentucky
> High average December temperature, 1991-2020: 47°F
> Low average December temperature, 1991-2020: 32°F
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28. Baltimore, Maryland
> High average December temperature, 1991-2020: 48°F
> Low average December temperature, 1991-2020: 30°F
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27. Washington, DC
> High average December temperature, 1991-2020: 49°F
> Low average December temperature, 1991-2020: 35°F
