Jamestown Weather Forecast

    • 26
    • 30

    Mostly Cloudy

    • 33
    • 38

    Mostly Cloudy

    • 29
    • 42

    Mostly Cloudy

    • 36
    • 41

    Cloudy

    • 34
    • 47

    Mostly Cloudy

    • 30
    • 43

    Mostly Cloudy

    • 20
    • 40

    Mostly Cloudy

Today 21 Dec Grant

Mostly sunny. Colder with Highs in the upper 20s. South Winds 5 to 10 Mph.

Tonight 21 Dec Grant

Mostly cloudy. A chance of freezing rain with a slight chance of snow after midnight. Not as cool with Lows in the mid 20s. Temperature rising into the lower 30s after midnight. South Winds 5 to 10 Mph. Chance of precipitation 30 percent.

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Jamestown Temperature Statistics

December Temperature

Platteville Municipal Airport (8.7 miles)

  • Lowest 14 December, 2025

    -7.8 °F

  • Average December

    18.5 °F

  • Highest 18 December, 2025

    39 °F

Climate (2020–Present)

Platteville Municipal Airport (8.7 miles)

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  • Average Low 2020–2025

    40.7 °F

  • Average 2020–2025

    49.8 °F

  • Average High 2020–2025

    58.6 °F
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