Olsons Bay Weather Forecast

    • 4
    • 31

    Snow Likely

    • 10
    • 18

    Mostly Cloudy

    • 9
    • 22

    Partly Sunny

    • 11
    • 22

    Mostly Cloudy

    • 21
    • 29

    Mostly Cloudy

    • 21
    • 34

    Mostly Cloudy

Today 31 Dec Jefferson

Cloudy. Chance of light snow and patchy light freezing drizzle late in the morning. Light snow likely early in the Afternoon, then chance of light snow late in the afternoon. Snow accumulation up to 1 inch. Total snow accumulation up to 2 Inches. Highs in the upper 20s. Northwest Winds 5 to 15 Mph. Chance of precipitation 60 percent.

Tonight 31 Dec Jefferson

Colder. Partly cloudy. Lows around 4. Northwest Winds 5 to 15 Mph.

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Olsons Bay Temperature Statistics

December Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 14 December, 2025

    -7.6 °F

  • Average December

    23.4 °F

  • Highest 18 December, 2025

    46.4 °F

Climate (2020–Present)

Janesville-Rock County (17.4 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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