Alder Lake Weather Forecast

    • 17
    • 21

    Chance Snow Showers

    • 9
    • 29

    Slight Chance Snow Showers

    • -8
    • 16

    Mostly Cloudy

    • -7
    • 2

    Chance Snow

    • 3
    • 9

    Chance Snow

    • 1
    • 13

    Slight Chance Snow

Today 21 Jan Western Ulster

Sunny this Morning, then mostly cloudy with a slight chance of snow Showers this afternoon. Not as cold with Highs in the mid 20s. West Winds around 5 Mph, becoming southwest with Gusts up to 20 Mph this afternoon. Chance of snow 20 percent.

Tonight 21 Jan Western Ulster

Mostly cloudy. A chance of snow Showers in the evening. Not as cold with Lows around 19. Temperature rising into the mid 20s after midnight. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph. Chance of snow 30 percent.

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Alder Lake Temperature Statistics

January Temperature

Monticello, Sullivan County International Airport (24.9 miles)

  • Lowest 1 January, 2026

    6.1 °F

  • Average January

    26.5 °F

  • Highest 9 January, 2026

    44.1 °F

Climate (2021–Present)

Monticello, Sullivan County International Airport (24.9 miles)

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  • Average Low 2021–2026

    36.6 °F

  • Average 2021–2026

    45.8 °F

  • Average High 2021–2026

    55.1 °F
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