Winthrop Weather Forecast

    • 11
    • 29

    Slight Chance Snow Showers

    • 19
    • 27

    Snow Likely

    • 19
    • 33

    Snow Likely

    • 18
    • 28

    Mostly Cloudy

    • 19
    • 30

    Chance Snow

    • 8
    • 28

    Chance Snow

Today 21 Dec Northern St. Lawrence

Partly sunny with a chance of snow Showers this Morning, then mostly cloudy this afternoon. Little or no snow accumulation. Highs in the upper 20s. West Winds 15 to 20 Mph with Gusts up to 35 Mph. Chance of snow 30 percent.

Tonight 21 Dec Northern St. Lawrence

Partly cloudy. Lows around 11. West Winds 10 to 15 Mph.

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Winthrop Temperature Statistics

December Temperature

Massena, Massena International-Richards Field (9.9 miles)

  • Lowest 9 December, 2025

    -14.1 °F

  • Average December

    19.1 °F

  • Highest 18 December, 2025

    48.9 °F

Climate (2020–Present)

Massena, Massena International-Richards Field (9.9 miles)

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  • Average Low 2020–2025

    36.4 °F

  • Average 2020–2025

    46.5 °F

  • Average High 2020–2025

    56.1 °F
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