Parnassus Weather Forecast

    • 7
    • 33

    Snow

    • 13
    • 21

    Snow Showers Likely

    • 13
    • 23

    Mostly Cloudy

    • 26
    • 34

    Mostly Cloudy

    • 27
    • 42

    Mostly Cloudy

    • 25
    • 51

    Rain

    • 23
    • 36

    Chance Freezing Rain

Today 13 Dec Westmoreland

Snow. Snow may be heavy at Times. Snow accumulation 1 to 2 Inches. Near steady temperature in the lower 30s. West Winds 10 to 15 Mph with Gusts up to 25 Mph. Chance of snow 90 percent.

Tonight 13 Dec Westmoreland

Snow. Snow accumulation 4 to 6 Inches. Cold with Lows around 12. West Winds 5 to 10 Mph with Gusts up to 25 Mph. Chance of snow near 100 percent.

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Parnassus Temperature Statistics

December Temperature

Pittsburgh - Allegheny County Airport (16.2 miles)

  • Lowest 9 December, 2025

    12.9 °F

  • Average December

    27.8 °F

  • Highest 10 December, 2025

    43 °F

Climate (2020–Present)

Pittsburgh - Allegheny County Airport (16.2 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    54.6 °F

  • Average High 2020–2025

    63.3 °F
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