Gilbert Bay Weather Forecast

    • 20
    • 24

    Snow Likely

    • 2
    • 27

    Snow Likely

    • 10
    • 18

    Mostly Cloudy

    • 9
    • 22

    Mostly Cloudy

    • 16
    • 24

    Mostly Cloudy

    • 19
    • 31

    Mostly Cloudy

Today 30 Dec Jefferson

Partly sunny. A 50 percent chance of light snow in the afternoon. Highs in the mid 20s. West Winds 5 to 15 Mph.

Tonight 30 Dec Jefferson

Not as cold. Mostly cloudy. A 20 percent chance of light snow through around midnight. Lows around 19. West Winds 10 to 15 Mph.

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Gilbert Bay Temperature Statistics

December Temperature

Janesville-Rock County (18.6 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    23.6 °F

  • Highest 18 December, 2025

    46.4 °F

Climate (2020–Present)

Janesville-Rock County (18.6 miles)

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  • Average Low 2020–2025

    40.4 °F

  • Average 2020–2025

    48.7 °F

  • Average High 2020–2025

    60.3 °F
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