Olsons Bay Weather Forecast

    • 25
    • 35

    Mostly Cloudy

    • 31
    • 35

    Chance Rain

    • 6
    • 41

    Partly Sunny

    • 16
    • 24

    Mostly Cloudy

Today 16 Dec Jefferson

Not as cold. Mostly sunny until late afternoon then becoming mostly cloudy. Highs in the mid 30s. Southwest Winds 5 to 15 Mph.

Tonight 16 Dec Jefferson

Not as cold. Mostly cloudy until early morning then becoming partly cloudy. Lows in the mid 20s. West Winds 10 to 15 Mph.

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Olsons Bay Temperature Statistics

December Temperature

Janesville-Rock County (17.4 miles)

  • Lowest 4 December, 2025

    -5.8 °F

  • Average December

    18.8 °F

  • Highest 10 December, 2025

    37.4 °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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