Fullerton Weather Forecast

    • 14
    • 37

    Clearing Late

    • 18
    • 27

    Mostly Sunny

    • 18
    • 33

    Partly Sunny

    • 18
    • 32

    Partly Sunny

    • 27
    • 37

    Mostly Cloudy

    • 29
    • 46

    Partly Sunny

Today 31 Dec De Witt

Cloudy. Not as cool with Highs in the upper 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

Tonight 31 Dec De Witt

Mostly cloudy with a chance of Flurries in the Evening, then partly cloudy after midnight. Cooler with Lows around 14. Northwest Winds 10 to 15 Mph, becoming north after midnight.

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Fullerton Temperature Statistics

December Temperature

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (20.5 miles)

  • Lowest 14 December, 2025

    -9 °F

  • Average December

    28.7 °F

  • Highest 28 December, 2025

    69.1 °F

Climate (2020–Present)

Bloomington/Normal, Central Illinois Regional Airport at Bloomington-Normal (20.5 miles)

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  • Average Low 2020–2025

    43.6 °F

  • Average 2020–2025

    52.9 °F

  • Average High 2020–2025

    62.2 °F
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