Cottonwood Lake Weather Forecast

    • 13
    • 21

    Increasing Clouds

    • 4
    • 34

    Chance Snow

    • -2
    • 14

    Chance Snow

    • 3
    • 14

    Mostly Cloudy

    • 5
    • 16

    Mostly Cloudy

    • 3
    • 20

    Mostly Cloudy

Today 29 Dec McHenry

Mostly cloudy. Highs 15 to 20. Southwest Winds 5 to 10 Mph.

Tonight 29 Dec McHenry

Mostly cloudy. A slight chance of snow after midnight. Not as cold. Lows around 10. Temperature rising into the in the mid 20s after midnight. West Winds 5 to 15 Mph. Chance of snow 20 percent.

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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

    13.5 °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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