Janesville Weather Forecast

    • 21
    • 29

    Slight Chance Freezing Drizzle

    • 13
    • 44

    Partly Sunny

    • 12
    • 23

    Mostly Sunny

    • 21
    • 31

    Mostly Sunny

    • 29
    • 44

    Mostly Sunny

    • 39
    • 47

    Chance Rain

Today 3 Dec Cumberland

Sunny. Highs around 30. West Winds around 5 Mph.

Tonight 3 Dec Cumberland

Mostly clear in the Evening, then partly cloudy with a slight chance of freezing drizzle after midnight. Lows around 20. Temperature rising into the mid 20s after midnight. South Winds 10 to 15 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Janesville Temperature Statistics

December Temperature

Mattoon / Charleston, Coles County Memorial Airport (6.8 miles)

  • Lowest 1 December, 2024

    14 °F

  • Average December

    21.7 °F

  • Highest 1 December, 2024

    28 °F

Climate (2019–Present)

Mattoon / Charleston, Coles County Memorial Airport (6.8 miles)

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  • Average Low 2019–2024

    45.9 °F

  • Average 2019–2024

    55.1 °F

  • Average High 2019–2024

    64.3 °F
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