Cottonwood Lake Weather Forecast

    • -2
    • 8

    Cold

    • 14
    • 28

    Mostly Cloudy

    • 3
    • 31

    Mostly Cloudy

    • 14
    • 23

    Mostly Cloudy

    • 16
    • 27

    Mostly Cloudy

    • 8
    • 31

    Mostly Cloudy

    • 5
    • 24

    Partly Sunny

Today 20 Dec McHenry

Sunny. Much Colder. Highs zero to 5 above. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 20 Dec McHenry

Partly cloudy. Lows around 5 below. Temperature rising after midnight. West Winds around 5 Mph, becoming southeast around 5 Mph after midnight.

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Cottonwood Lake Temperature Statistics

December Temperature

Harvey Municipal Airport (34.8 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 (34.8 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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