Whitewater Lake Weather Forecast

    • 15
    • 20

    Increasing Clouds

    • 8
    • 36

    Slight Chance Rain/Snow

    • 15
    • 22

    Partly Sunny

    • 32
    • 36

    Mostly Cloudy

    • 26
    • 42

    Mostly Cloudy

    • 36
    • 46

    Slight Chance Rain

    • 31
    • 52

    Mostly Cloudy

Today 19 Dec Walworth

Partly sunny. Southwest Winds 5 to 10 Mph.

Tonight 19 Dec Walworth

Mostly cloudy then becoming partly cloudy in the late evening and early morning then becoming mostly cloudy. Lows around 16. South Winds 5 to 15 Mph increasing to 15 to 20 Mph after midnight.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Whitewater Lake Temperature Statistics

December Temperature

Janesville-Rock County (19.9 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    18.2 °F

  • Highest 10 December, 2025

    37.4 °F

Climate (2020–Present)

Janesville-Rock County (19.9 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.2 °F
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