Round Lake Weather Forecast

    • 10
    • 25

    Slight Chance Snow

    • 3
    • 25

    Chance Wintry Mix

    • 12
    • 19

    Mostly Cloudy

    • 13
    • 25

    Mostly Cloudy

    • 6
    • 29

    Mostly Cloudy

    • 3
    • 21

    Mostly Cloudy

Today 21 Dec McHenry

Mostly sunny. Not as cold. Highs in the lower 20s. South Winds around 5 Mph.

Tonight 21 Dec McHenry

Mostly cloudy with isolated snow Showers. Lows around 5 below. Southeast Winds around 5 Mph.

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Round Lake Temperature Statistics

December Temperature

Harvey Municipal Airport (23 miles)

  • Lowest 7 December, 2025

    -18.4 °F

  • Average December

    12.5 °F

  • Highest 16 December, 2025

    44.6 °F

Climate (2020–Present)

Harvey Municipal Airport (23 miles)

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  • Average Low 2020–2025

    30.3 °F

  • Average 2020–2025

    41.3 °F

  • Average High 2020–2025

    52 °F
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