Waterloo Weather Forecast

    • 4
    • 35

    Snow Showers

    • 8
    • 16

    Snow Likely

    • 11
    • 21

    Partly Sunny

    • 8
    • 25

    Partly Sunny

    • 20
    • 26

    Chance Snow

    • 24
    • 37

    Mostly Cloudy

    • 22
    • 38

    Mostly Cloudy

Today 31 Dec Jefferson

Light snow. Little new snow accumulation. Northwest Winds 10 to 15 Mph with Gusts to around 30 Mph. Chance of snow near 100 percent.

Tonight 31 Dec Jefferson

Colder. Mostly cloudy in the evening then clearing. A 40 percent chance of light snow in the evening. Lows around 5. Northwest Winds 5 to 15 Mph. Gusts up to 30 Mph through around midnight.

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Waterloo Temperature Statistics

December Temperature

Watertown (13 miles)

  • Lowest 14 December, 2025

    -7.2 °F

  • Average December

    22.3 °F

  • Highest 23 December, 2025

    43.3 °F

Climate (2020–Present)

Watertown (13 miles)

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  • Average Low 2020–2025

    35.7 °F

  • Average 2020–2025

    45.5 °F

  • Average High 2020–2025

    54.5 °F
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