Sullivan County International Airport Weather Forecast

    • -2
    • 16

    Decreasing Clouds

    • 5
    • 19

    Partly Sunny

    • 4
    • 26

    Mostly Sunny

    • 7
    • 28

    Mostly Cloudy

    • 5
    • 25

    Mostly Cloudy

    • 4
    • 25

    Partly Sunny

Today 31 Jan Sullivan

Partly sunny. Highs 15 to 20. Northwest Winds around 5 Mph.

Tonight 31 Jan Sullivan

Partly cloudy. Lows zero to 5 below. North Winds 5 to 10 Mph.

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Sullivan County International Airport Temperature Statistics

January Temperature

Monticello, Sullivan County International Airport (0 miles)

  • Lowest 21 January, 2026

    -9 °F

  • Average January

    21.9 °F

  • Highest 9 January, 2026

    44.1 °F

Climate (2021–Present)

Monticello, Sullivan County International Airport (0 miles)

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  • Average Low 2021–2026

    36.5 °F

  • Average 2021–2026

    45.7 °F

  • Average High 2021–2026

    55 °F
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