Chambersburg Weather Forecast

    • 15
    • 28

    Clearing Late

    • 20
    • 31

    Partly Sunny

    • 22
    • 42

    Mostly Cloudy

    • 37
    • 52

    Rain

    • 22
    • 47

    Mostly Cloudy

    • 32
    • 39

    Chance Rain

Today 15 Dec Mercer

Sunny this Morning, then becoming mostly cloudy. Cold with Highs in the upper 20s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 15 Dec Mercer

Mostly cloudy. Cold with Lows around 14. Southwest Winds around 5 Mph.

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Chambersburg Temperature Statistics

December Temperature

Trenton, Mercer County Airport (5.6 miles)

  • Lowest 9 December, 2025

    10.9 °F

  • Average December

    31.1 °F

  • Highest 10 December, 2025

    43 °F

Climate (2020–Present)

Trenton, Mercer County Airport (5.6 miles)

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  • Average Low 2020–2025

    46.2 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    64.3 °F
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