Flat Lake Weather Forecast

    • 5
    • 11

    Chance Snow

    • -9
    • 21

    Chance Snow

    • -14
    • -2

    Cold

    • -18
    • -4

    Cold

    • 3
    • 15

    Cold

    • 11
    • 25

    Mostly Cloudy

Today 10 Dec McHenry

Mostly cloudy. A chance of snow late. Much Colder. Highs around 10. Northwest Winds around 20 Mph with Gusts up to 30 Mph, Diminishing to 5 to 15 Mph with Gusts up to 25 Mph. Chance of snow 30 percent.

Tonight 10 Dec McHenry

Cloudy. A chance of snow after midnight. Little or no new snow accumulation. Lows zero to 5 above. Temperature rising after midnight. Southeast Winds 5 to 15 Mph. Chance of snow 30 percent.

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Flat Lake Temperature Statistics

December Temperature

Harvey Municipal Airport (22.4 miles)

  • Lowest 7 December, 2025

    -18.4 °F

  • Average December

    8.8 °F

  • Highest 2 December, 2025

    33.8 °F

Climate (2020–Present)

Harvey Municipal Airport (22.4 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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