Sullivan Weather Forecast

    • 19
    • 26

    Slight Chance Snow

    • 31
    • 36

    Slight Chance Snow

    • 24
    • 40

    Mostly Cloudy

    • 37
    • 41

    Slight Chance Rain

    • 32
    • 49

    Mostly Cloudy

    • 28
    • 41

    Mostly Cloudy

Today 21 Dec Jefferson

Colder, sunny. Highs in the mid 20s. West Winds 5 to 10 Mph shifting to the southwest in the afternoon.

Tonight 21 Dec Jefferson

Clear. Lows around 8. Northwest Winds 5 to 15 Mph.

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Sullivan Temperature Statistics

December Temperature

Watertown (12.4 miles)

  • Lowest 14 December, 2025

    -7.2 °F

  • Average December

    18 °F

  • Highest 18 December, 2025

    43.2 °F

Climate (2020–Present)

Watertown (12.4 miles)

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  • Average Low 2020–2025

    35.6 °F

  • Average 2020–2025

    45.4 °F

  • Average High 2020–2025

    54.5 °F
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