Grass Lake Weather Forecast

    • 21
    • 27

    Increasing Clouds

    • 32
    • 37

    Mostly Cloudy

    • 25
    • 41

    Mostly Cloudy

    • 35
    • 42

    Chance Rain

    • 31
    • 46

    Mostly Cloudy

    • 27
    • 38

    Mostly Cloudy

Today 21 Dec Dane

Colder, sunny. Highs in the upper 20s. West Winds up to 5 Mph shifting to the southwest in the afternoon.

Tonight 21 Dec Dane

Not as cold. Partly cloudy through around Midnight, then cloudy with a 30 percent chance of light snow after midnight. Lows around 20. South Winds 5 to 15 Mph.

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Grass Lake Temperature Statistics

December Temperature

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

  • Lowest 14 December, 2025

    -7.1 °F

  • Average December

    18.6 °F

  • Highest 18 December, 2025

    42.1 °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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