Chambersburg Weather Forecast

    • 22
    • 40

    Mostly Cloudy

    • 13
    • 30

    Partly Sunny

    • 26
    • 35

    Mostly Cloudy

    • 31
    • 47

    Chance Rain

    • 28
    • 41

    Chance Rain/Snow

    • 19
    • 37

    Chance Snow

Today 7 Dec Franklin

Mostly cloudy. Highs around 40. South Winds around 5 Mph.

Tonight 7 Dec Franklin

Mostly cloudy in the Evening, then becoming partly cloudy. Cooler with Lows in the lower 20s. Northwest Winds 5 to 10 Mph with Gusts up to 25 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Chambersburg Temperature Statistics

December Temperature

Hagerstown, Washington County Regional Airport (16.2 miles)

  • Lowest 4 December, 2025

    26.1 °F

  • Average December

    33.3 °F

  • Highest 1 December, 2025

    42.1 °F

Climate (2020–Present)

Hagerstown, Washington County Regional Airport (16.2 miles)

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  • Average Low 2020–2025

    47.9 °F

  • Average 2020–2025

    56.8 °F

  • Average High 2020–2025

    65.8 °F
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