Alder Lake Weather Forecast

    • 17
    • 31

    Mostly Cloudy

    • 8
    • 30

    Slight Chance Snow

    • -4
    • 16

    Partly Sunny

    • 16
    • 23

    Snow Likely

    • 22
    • 33

    Snow

    • 16
    • 28

    Chance Snow

    • 10
    • 26

    Chance Snow

Today 6 Dec Western Ulster

Mostly sunny. Not as cool with Highs in the mid 30s. West Winds around 5 Mph.

Tonight 6 Dec Western Ulster

Mostly cloudy. Cold with Lows around 19. Northwest Winds around 5 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Alder Lake Temperature Statistics

December Temperature

Monticello, Sullivan County International Airport (24.9 miles)

  • Lowest 4 December, 2025

    10 °F

  • Average December

    26.4 °F

  • Highest 1 December, 2025

    35.1 °F

Climate (2020–Present)

Monticello, Sullivan County International Airport (24.9 miles)

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  • Average Low 2020–2025

    36.8 °F

  • Average 2020–2025

    46 °F

  • Average High 2020–2025

    55.3 °F
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