Grass Lake Weather Forecast

    • 9
    • 22

    Chance Snow

    • -1
    • 24

    Chance Snow

    • -10
    • 4

    Slight Chance Snow

    • -6
    • 6

    Cold

    • 8
    • 22

    Mostly Cloudy

    • 25
    • 32

    Mostly Cloudy

Today 11 Dec Dane

Partly sunny late in the morning then becoming cloudy. Highs in the lower 20s. West Winds up to 5 Mph shifting to the southwest in the afternoon.

Tonight 11 Dec Dane

Mostly cloudy. A 30 percent chance of light snow through around midnight. Lows around 8. Northeast Winds up to 5 Mph.

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Grass Lake Temperature Statistics

December Temperature

Madison, Dane County Regional-Truax Field (17.4 miles)

  • Lowest 4 December, 2025

    -2 °F

  • Average December

    18.3 °F

  • Highest 9 December, 2025

    36 °F

Climate (2020–Present)

Madison, Dane County Regional-Truax Field (17.4 miles)

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  • Average Low 2020–2025

    39.9 °F

  • Average 2020–2025

    49.6 °F

  • Average High 2020–2025

    58.8 °F
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