Crystal Lake Weather Forecast

    • 14
    • 22

    Mostly Cloudy

    • 28
    • 34

    Mostly Cloudy

    • 32
    • 37

    Rain Likely

    • 8
    • 43

    Slight Chance Rain/Snow

    • 21
    • 28

    Mostly Cloudy

    • 20
    • 40

    Mostly Cloudy

Today 15 Dec McHenry

Mostly cloudy. Blustery. Highs in the lower 20s. Southwest Winds 15 to 20 Mph, Diminishing to 10 to 15 Mph in the afternoon. Gusts up to 30 Mph. Wind chill Values as low as 14 below in the morning.

Tonight 15 Dec McHenry

Partly cloudy. Patchy fog after midnight. Lows around 13. Southwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

December Temperature

Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)

  • Lowest 13 December, 2025

    1.9 °F

  • Average December

    23 °F

  • Highest 10 December, 2025

    39 °F

Climate (2020–Present)

Chicago / Wheeling, Pal-Waukee Airport (22.4 miles)

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  • Average Low 2020–2025

    44.2 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    61.5 °F
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