Cornwall Weather Forecast

    • 12
    • 36

    Becoming Sunny

    • 21
    • 30

    Mostly Cloudy

    • 23
    • 37

    Mostly Cloudy

    • 20
    • 38

    Mostly Cloudy

    • 11
    • 28

    Partly Sunny

    • 25
    • 33

    Mostly Cloudy

Today 4 Dec Lebanon

Cloudy this Morning, then becoming mostly sunny. Highs in the upper 30s. West Winds 10 to 15 Mph with Gusts up to 30 Mph.

Tonight 4 Dec Lebanon

Mostly clear. Colder with Lows around 10. Northwest Winds 10 to 15 Mph, becoming northeast around 5 Mph after midnight.

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Cornwall Temperature Statistics

December Temperature

Lancaster, Lancaster Airport (11.8 miles)

  • Lowest 1 December, 2025

    26.1 °F

  • Average December

    32.8 °F

  • Highest 1 December, 2025

    41 °F

Climate (2020–Present)

Lancaster, Lancaster Airport (11.8 miles)

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  • Average Low 2020–2025

    46.3 °F

  • Average 2020–2025

    55.9 °F

  • Average High 2020–2025

    65.5 °F
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