Grenell Weather Forecast

    • 27
    • 32

    Chance Snow

    • 26
    • 36

    Rain/Snow

    • 21
    • 30

    Mostly Cloudy

    • 25
    • 35

    Rain/Snow Likely

    • 19
    • 35

    Rain/Snow Likely

    • 21
    • 32

    Snow Showers Likely

Today 22 Dec Jefferson

Mostly cloudy. A chance of snow Showers through early afternoon. Highs Ranging from the lower 30s inland to the mid 30s along the lake Ontario shore. Light Winds, becoming southwest 5 to 10 Mph. Chance of snow 40 percent.

Tonight 22 Dec Jefferson

Snow likely. Additional accumulation Ranging from an inch or less across the lower Elevations to 1 to 2 Inches on the tug hill. Lows in the upper 20s. Light southwest Winds. Chance of snow 70 percent.

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Grenell Temperature Statistics

December Temperature

Watertown, Watertown International Airport (19.9 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 (19.9 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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