Cook County Forest Preserve Weather Forecast

    • 23
    • 27

    Cloudy

    • 6
    • 30

    Chance Snow

    • -2
    • 13

    Chance Snow

    • 0
    • 11

    Partly Sunny

    • 17
    • 23

    Mostly Cloudy

    • 31
    • 36

    Mostly Cloudy

    • 33
    • 42

    Chance Rain

Today 11 Dec Northern Cook

Mostly cloudy. Highs in the upper 20s. West Winds 5 to 10 Mph.

Tonight 11 Dec Northern Cook

Mostly cloudy. Near steady temperature in the lower 20s. North Winds around 5 Mph.

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Cook County Forest Preserve Temperature Statistics

December Temperature

Chicago, Chicago-O'Hare International Airport (2.5 miles)

  • Lowest 4 December, 2025

    7 °F

  • Average December

    23.1 °F

  • Highest 9 December, 2025

    37.9 °F

Climate (2020–Present)

Chicago, Chicago-O'Hare International Airport (2.5 miles)

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  • Average Low 2020–2025

    45.4 °F

  • Average 2020–2025

    53.5 °F

  • Average High 2020–2025

    61.7 °F
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