Rock River Park Weather Forecast

    • 32
    • 38

    Slight Chance Rain/Snow

    • 24
    • 42

    Mostly Cloudy

    • 38
    • 41

    Slight Chance Rain

    • 35
    • 44

    Chance Rain

    • 29
    • 44

    Mostly Cloudy

    • 19
    • 40

    Mostly Cloudy

Today 22 Dec Jefferson

Not as cold. Cloudy. Chance of light snow in the Morning, then slight chance of light rain and snow in the afternoon. Highs in the upper 30s. South Winds 5 to 15 Mph. Chance of precipitation 40 percent.

Tonight 22 Dec Jefferson

Mostly cloudy until early morning then becoming partly cloudy. Lows in the lower 30s. Southwest Winds 5 to 10 Mph.

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Rock River Park Temperature Statistics

December Temperature

Watertown (17.4 miles)

  • Lowest 14 December, 2025

    -7.2 °F

  • Average December

    17.7 °F

  • Highest 18 December, 2025

    43.2 °F

Climate (2020–Present)

Watertown (17.4 miles)

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  • Average Low 2020–2025

    35.6 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    54.5 °F
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