Lake Koshkonong Weather Forecast

    • 19
    • 26

    Chance Wintry Mix

    • 10
    • 24

    Snow

    • -4
    • 20

    Chance Snow

    • 12
    • 20

    Snow Likely

    • 24
    • 33

    Snow

    • 6
    • 33

    Chance Snow

Today 5 Dec Jefferson

Not as cold. Mostly cloudy. A 40 percent chance of light snow in the afternoon. Highs in the mid 20s. Southwest Winds 10 to 15 Mph.

Tonight 5 Dec Jefferson

Not as cold. Cloudy. Chance of light Snow, possibly mixed with freezing drizzle through around midnight. Lows around 17. West Winds 5 to 10 Mph. Chance of precipitation 50 percent.

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Lake Koshkonong Temperature Statistics

December Temperature

Watertown (20.5 miles)

  • Lowest 1 December, 2025

    1.4 °F

  • Average December

    18.6 °F

  • Highest 3 December, 2025

    29.8 °F

Climate (2020–Present)

Watertown (20.5 miles)

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  • Average Low 2020–2025

    35.8 °F

  • Average 2020–2025

    45.5 °F

  • Average High 2020–2025

    54.6 °F
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