Grahamsville Weather Forecast

    • 20
    • 41

    Decreasing Clouds

    • 39
    • 43

    Mostly Cloudy

    • 21
    • 48

    Rain Showers Likely

    • 25
    • 34

    Mostly Cloudy

    • 19
    • 38

    Mostly Cloudy

    • 17
    • 31

    Partly Sunny

Today 17 Dec Sullivan

Partly sunny. Highs in the lower 40s. West Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 17 Dec Sullivan

Partly cloudy. Lows 15 to 20. Northwest Winds 5 to 10 Mph.

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Grahamsville Temperature Statistics

December Temperature

Monticello, Sullivan County International Airport (16.2 miles)

  • Lowest 5 December, 2025

    -2 °F

  • Average December

    22.6 °F

  • Highest 1 December, 2025

    35.1 °F

Climate (2020–Present)

Monticello, Sullivan County International Airport (16.2 miles)

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  • Average Low 2020–2025

    36.6 °F

  • Average 2020–2025

    45.9 °F

  • Average High 2020–2025

    55.2 °F
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