Rock River Park Weather Forecast

    • 16
    • 20

    Increasing Clouds

    • 7
    • 36

    Partly Sunny

    • 15
    • 23

    Partly Sunny

    • 32
    • 37

    Mostly Cloudy

    • 25
    • 42

    Mostly Cloudy

    • 36
    • 46

    Slight Chance Rain

    • 30
    • 52

    Mostly Cloudy

Today 19 Dec Jefferson

Partly sunny. Southwest Winds 5 to 10 Mph.

Tonight 19 Dec Jefferson

Mostly cloudy. Lows around 16. South Winds 5 to 15 Mph.

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  • Temperature Real-Time

Rock River Park Temperature Statistics

December Temperature

Watertown (17.4 miles)

  • Lowest 14 December, 2025

    -7.2 °F

  • Average December

    17 °F

  • Highest 17 December, 2025

    37.4 °F

Climate (2020–Present)

Watertown (17.4 miles)

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  • Average Low 2020–2025

    35.7 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    54.5 °F
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