Crystal Lake Weather Forecast

    • 14
    • 27

    Increasing Clouds

    • 15
    • 29

    Snow Showers Likely

    • 11
    • 19

    Mostly Cloudy

    • 12
    • 23

    Slight Chance Snow Showers

    • 19
    • 24

    Mostly Cloudy

    • 29
    • 35

    Mostly Cloudy

Today 12 Dec Sullivan

Mostly sunny. Highs in the upper 20s. West Winds 5 to 10 Mph. Wind chill Values as low as 1 above this morning.

Tonight 12 Dec Sullivan

Partly cloudy in the Evening, then becoming mostly cloudy. Lows around 15. Southwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Crystal Lake Temperature Statistics

December Temperature

Williamsport - Lycoming County Airport (14.3 miles)

  • Lowest 9 December, 2025

    6.1 °F

  • Average December

    28.1 °F

  • Highest 1 December, 2025

    37 °F

Climate (2020–Present)

Williamsport - Lycoming County Airport (14.3 miles)

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  • Average Low 2020–2025

    43.8 °F

  • Average 2020–2025

    53 °F

  • Average High 2020–2025

    63.2 °F
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