Mount Gretna Weather Forecast

    • 10
    • 20

    Mostly Sunny

    • 29
    • 33

    Mostly Cloudy

    • 21
    • 42

    Partly Sunny

    • 8
    • 29

    Mostly Cloudy

    • 10
    • 15

    Chance Snow Showers

    • 9
    • 18

    Chance Snow Showers

Today 20 Jan Lebanon

Sunny, Colder with Highs around 20. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Wind chill Values as low as 7 below this morning.

Tonight 20 Jan Lebanon

Mostly clear. Lows around 10. West Winds 5 to 10 Mph, becoming southwest after midnight. Wind chill Values as low as 3 above.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Mount Gretna Temperature Statistics

January Temperature

Lancaster, Lancaster Airport (12.4 miles)

  • Lowest 1 January, 2026

    18 °F

  • Average January

    33.4 °F

  • Highest 7 January, 2026

    55 °F

Climate (2021–Present)

Lancaster, Lancaster Airport (12.4 miles)

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  • Average Low 2021–2026

    46.1 °F

  • Average 2021–2026

    55.7 °F

  • Average High 2021–2026

    65.3 °F
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