Clear Lake Weather Forecast

    • 14
    • 24

    Decreasing Clouds

    • 26
    • 32

    Partly Sunny

    • 20
    • 38

    Mostly Cloudy

    • 22
    • 31

    Partly Sunny

    • 23
    • 38

    Mostly Cloudy

    • 23
    • 38

    Partly Sunny

    • 28
    • 43

    Mostly Cloudy

Today 29 Dec Sangamon

Partly sunny with a 20 percent chance of snow. Brisk and much cooler. Near steady temperature in the lower 20s. Northwest Winds 20 to 25 Mph with Gusts up to 35 Mph.

Tonight 29 Dec Sangamon

Partly cloudy in the Evening, then becoming mostly clear. Lows around 14. Northwest Winds 15 to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Clear Lake Temperature Statistics

December Temperature

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

  • Lowest 14 December, 2025

    -6 °F

  • Average December

    30.9 °F

  • Highest 23 December, 2025

    60.1 °F

Climate (2020–Present)

Springfield - Abraham Lincoln Capital Airport (6.2 miles)

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  • Average Low 2020–2025

    44.9 °F

  • Average 2020–2025

    55.2 °F

  • Average High 2020–2025

    65.1 °F
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