Riverside Weather Forecast

    • 24
    • 37

    Increasing Clouds

    • 9
    • 36

    Partly Sunny

    • 17
    • 28

    Mostly Cloudy

    • 22
    • 35

    Mostly Cloudy

    • 18
    • 34

    Mostly Cloudy

    • 14
    • 30

    Mostly Cloudy

Today 3 Dec Northumberland

Mostly sunny. Highs in the mid 30s. West Winds around 5 Mph.

Tonight 3 Dec Northumberland

Partly cloudy in the Evening, then becoming mostly cloudy. Lows in the mid 20s. Southwest Winds around 5 Mph.

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Riverside Temperature Statistics

December Temperature

Selinsgrove Penn Valley Airport (15.5 miles)

  • Lowest 1 December, 2025

    23 °F

  • Average December

    33 °F

  • Highest 1 December, 2025

    39 °F

Climate (2020–Present)

Selinsgrove Penn Valley Airport (15.5 miles)

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  • Average Low 2020–2025

    42.5 °F

  • Average 2020–2025

    52.7 °F

  • Average High 2020–2025

    63.1 °F
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