Summit Weather Forecast

    • 23
    • 23

    Snow

    • 11
    • 30

    Snow Likely

    • 16
    • 22

    Partly Sunny

    • 16
    • 28

    Partly Sunny

    • 19
    • 27

    Partly Sunny

    • 27
    • 33

    Mostly Cloudy

    • 23
    • 35

    Mostly Cloudy

Today 30 Dec Central Cook

Mostly cloudy. A chance of Flurries early in the afternoon. Snow likely late. Little or no snow accumulation. Highs in the mid 20s. West Winds around 10 Mph. Chance of precipitation 70 percent.

Tonight 30 Dec Central Cook

A chance of snow Early, then snow in the evening. Snow accumulation around an inch. Lows in the lower 20s. West Winds 10 to 15 Mph. Chance of precipitation near 100 percent.

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Summit Temperature Statistics

December Temperature

Chicago, Chicago Midway Airport (2.5 miles)

  • Lowest 14 December, 2025

    -0.9 °F

  • Average December

    29.2 °F

  • Highest 28 December, 2025

    57.9 °F

Climate (2020–Present)

Chicago, Chicago Midway Airport (2.5 miles)

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  • Average Low 2020–2025

    46.8 °F

  • Average 2020–2025

    54.3 °F

  • Average High 2020–2025

    61.9 °F
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