Tri-County Airport Weather Forecast

    • 21
    • 43

    Becoming Sunny

    • 24
    • 35

    Mostly Sunny

    • 37
    • 44

    Mostly Cloudy

    • 35
    • 53

    Mostly Cloudy

    • 48
    • 54

    Mostly Cloudy

    • 40
    • 65

    Mostly Cloudy

Today 20 Dec Knox

Partly sunny. Not as cool with Highs in the lower 40s. Temperature falling into the mid 30s in the afternoon. Southwest Winds 10 to 15 Mph with Gusts up to 30 Mph, becoming northwest with Gusts up to 20 Mph in the afternoon.

Tonight 20 Dec Knox

Mostly cloudy and not as cool. Near steady temperature in the lower 30s. South Winds 15 to 20 Mph with Gusts up to 30 Mph.

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Tri-County Airport Temperature Statistics

December Temperature

Peoria - General Downing-Peoria International Airport (21.1 miles)

  • Lowest 14 December, 2025

    -6 °F

  • Average December

    22.4 °F

  • Highest 10 December, 2025

    44.1 °F

Climate (2020–Present)

Peoria - General Downing-Peoria International Airport (21.1 miles)

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  • Average Low 2020–2025

    45.2 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    64.1 °F
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