Crystal Lake Weather Forecast

    • 35
    • 51

    Decreasing Clouds

    • 31
    • 70

    Mostly Sunny

    • 37
    • 53

    Mostly Cloudy

    • 41
    • 67

    Partly Sunny

    • 32
    • 65

    Mostly Cloudy

    • 31
    • 57

    Partly Sunny

Today 21 Dec Brown

Mostly sunny. Highs in the lower 50s. South Winds 10 to 20 Mph.

Tonight 21 Dec Brown

Mostly cloudy in the evening then clearing. Lows in the mid 30s. Southwest Winds 10 to 20 Mph.

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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

    31.2 °F

  • Highest 16 December, 2025

    66.6 °F

Climate (2020–Present)

Ainsworth Regional Airport (19.3 miles)

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  • Average Low 2020–2025

    37.8 °F

  • Average 2020–2025

    49.4 °F

  • Average High 2020–2025

    61.8 °F
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