Crystal Lake Weather Forecast

    • 1
    • 19

    Partly Sunny

    • 15
    • 28

    Mostly Cloudy

    • 6
    • 32

    Mostly Cloudy

    • 5
    • 29

    Mostly Cloudy

    • -6
    • 17

    Mostly Cloudy

    • -6
    • 9

    Chance Snow

Today 19 Jan Dakota

Mostly sunny. Cooler with Highs around 19. Northwest Winds 10 to 15 Mph with Gusts up to 25 Mph. Wind chill Values as low as 19 below in the morning.

Tonight 19 Jan Dakota

Mostly cloudy in the Evening, then clearing. Cold with Lows around 2 above. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

January Temperature

Sioux City, Sioux Gateway Airport (5 miles)

  • Lowest 16 January, 2026

    8.1 °F

  • Average January

    31 °F

  • Highest 7 January, 2026

    63 °F

Climate (2021–Present)

Sioux City, Sioux Gateway Airport (5 miles)

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  • Average Low 2021–2026

    39 °F

  • Average 2021–2026

    50.9 °F

  • Average High 2021–2026

    62.8 °F
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