Thornton Weather Forecast

    • 5
    • 21

    Increasing Clouds

    • 22
    • 28

    Slight Chance Snow

    • 18
    • 30

    Chance Snow

    • 11
    • 29

    Slight Chance Snow

    • 15
    • 22

    Chance Snow

    • 23
    • 33

    Chance Rain/Snow

Today 4 Dec Southern Cook

Mostly sunny late in the Morning, then becoming partly cloudy. Very cold. Highs in the lower 20s. Northwest Winds around 5 Mph.

Tonight 4 Dec Southern Cook

Mostly clear in the Evening, then becoming partly cloudy. Very cold with Lows around 4 above. South Winds 5 to 10 Mph. Wind chill Values as low as 9 below.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Thornton Temperature Statistics

December Temperature

Lansing Municipal Airport (4.3 miles)

  • Lowest 1 December, 2025

    13.8 °F

  • Average December

    21.1 °F

  • Highest 1 December, 2025

    28.4 °F

Climate (2020–Present)

Lansing Municipal Airport (4.3 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    51.5 °F

  • Average High 2020–2025

    60.4 °F
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