Lake Koshkonong Weather Forecast

    • -4
    • 3

    Flurries

    • 8
    • 15

    Partly Sunny

    • 4
    • 23

    Chance Snow

    • -9
    • 15

    Mostly Cloudy

    • -19
    • -2

    Slight Chance Snow

    • -13
    • 0

    Chance Snow

Today 19 Jan Jefferson

Bitterly cold. Colder, breezy. Partly sunny. Scattered snow Showers in the morning. Patchy blowing snow until late afternoon. Highs around 3. West Winds 15 to 25 Mph with Gusts to around 40 Mph. Chance of snow 20 percent. Lowest wind chill Readings 19 below to 29 below zero until late afternoon.

Tonight 19 Jan Jefferson

Mostly cloudy in the evening then becoming partly cloudy. Lows around 4 below. West Winds 5 to 15 Mph.

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Lake Koshkonong Temperature Statistics

January Temperature

Watertown (20.5 miles)

  • Lowest 4 January, 2026

    4.5 °F

  • Average January

    27.6 °F

  • Highest 9 January, 2026

    55.2 °F

Climate (2021–Present)

Watertown (20.5 miles)

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  • Average Low 2021–2026

    35.6 °F

  • Average 2021–2026

    45.5 °F

  • Average High 2021–2026

    54.6 °F
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