Crystal Lake Weather Forecast

    • 17
    • 32

    Mostly Sunny

    • 24
    • 45

    Partly Sunny

    • 19
    • 51

    Mostly Sunny

    • 24
    • 47

    Partly Sunny

    • 24
    • 47

    Partly Sunny

    • 23
    • 46

    Partly Sunny

Today 29 Dec Brown

Sunny. Highs in the lower 30s. Northwest Winds 10 to 15 Mph.

Tonight 29 Dec Brown

Mostly clear. Lows around 18. Light and variable Winds, becoming west around 10 Mph after midnight.

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Crystal Lake Temperature Statistics

December Temperature

Ainsworth Regional Airport (19.3 miles)

  • Lowest 13 December, 2025

    -3.8 °F

  • Average December

    35.2 °F

  • Highest 22 December, 2025

    77.9 °F

Climate (2020–Present)

Ainsworth Regional Airport (19.3 miles)

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  • Average Low 2020–2025

    37.8 °F

  • Average 2020–2025

    49.5 °F

  • Average High 2020–2025

    61.9 °F
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