Round Lake Weather Forecast

    • 10
    • 24

    Mostly Sunny

    • 27
    • 34

    Partly Sunny

    • 21
    • 39

    Mostly Cloudy

    • 26
    • 32

    Mostly Cloudy

    • 31
    • 43

    Partly Sunny

    • 24
    • 43

    Partly Sunny

Today 20 Dec Clark

Mostly sunny. Highs in the mid 20s. Northwest Winds 15 to 20 Mph with Gusts up to 35 Mph.

Tonight 20 Dec Clark

Mostly clear. Near steady temperature around 15. Temperature rising to around 16 after midnight. North Winds 5 to 10 Mph with Gusts up to 20 Mph, becoming southeast after midnight.

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Round Lake Temperature Statistics

December Temperature

Watertown, Watertown Municipal Airport (31.7 miles)

  • Lowest 4 December, 2025

    -13 °F

  • Average December

    15.5 °F

  • Highest 16 December, 2025

    45 °F

Climate (2020–Present)

Watertown, Watertown Municipal Airport (31.7 miles)

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  • Average Low 2020–2025

    35.2 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    55.7 °F
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