Cook County Forest Preserve Weather Forecast

    • 6
    • 19

    Increasing Clouds

    • 25
    • 28

    Chance Wintry Mix

    • 19
    • 30

    Chance Snow

    • 11
    • 27

    Chance Snow

    • 16
    • 24

    Snow Likely

    • 24
    • 33

    Rain/Snow Likely

    • 14
    • 35

    Chance Rain/Snow

Today 4 Dec Northern Cook

Sunny. Very cold. Highs around 19. Northwest Winds 5 to 10 Mph, becoming west in the afternoon.

Tonight 4 Dec Northern Cook

Clear in the Evening, then becoming partly cloudy. Patchy freezing fog after midnight. Very cold. Lows zero to 6 above zero. Temperature rising to around 11 after midnight. Southwest Winds 5 to 10 Mph. Wind chill Values as low as 14 below.

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Cook County Forest Preserve Temperature Statistics

December Temperature

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

  • Lowest 2 December, 2025

    17.1 °F

  • Average December

    21.6 °F

  • Highest 1 December, 2025

    30 °F

Climate (2020–Present)

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

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  • Average Low 2020–2025

    45.5 °F

  • Average 2020–2025

    53.5 °F

  • Average High 2020–2025

    61.7 °F
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