Round Island Weather Forecast

    • 15
    • 29

    Slight Chance Snow Showers

    • 25
    • 31

    Snow

    • 22
    • 36

    Rain/Snow

    • 22
    • 31

    Slight Chance Snow Showers

    • 22
    • 33

    Snow Showers Likely

    • 12
    • 31

    Slight Chance Snow Showers

Today 21 Dec Jefferson

Partly sunny with a 50 percent chance of snow Showers. Windy. Near steady Temperatures Ranging from the lower 20s on the tug hill to the upper 20s across the lower Elevations. West Winds 20 to 30 Mph.

Tonight 21 Dec Jefferson

Mostly cloudy and Colder with Lows Ranging from 10 to 15 across the tug hill to 15 to 20 along the lake Ontario shore. Northwest Winds 10 to 15 Mph with Gusts up to 30 Mph in the Evening, becoming light.

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Round Island Temperature Statistics

December Temperature

Watertown, Watertown International Airport (18 miles)

  • Lowest 5 December, 2025

    -6 °F

  • Average December

    25.2 °F

  • Highest 19 December, 2025

    55 °F

Climate (2020–Present)

Watertown, Watertown International Airport (18 miles)

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  • Average Low 2020–2025

    38.8 °F

  • Average 2020–2025

    48.6 °F

  • Average High 2020–2025

    57.6 °F
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