Helena Weather Forecast

    • 10
    • 37

    Slight Chance Snow Showers

    • 19
    • 25

    Chance Snow

    • 18
    • 32

    Snow Likely

    • 16
    • 28

    Mostly Cloudy

    • 21
    • 31

    Snow Showers Likely

    • 11
    • 30

    Chance Snow

    • 14
    • 24

    Slight Chance Snow

Today 21 Dec Northern St. Lawrence

Mostly cloudy with a 20 percent chance of snow Showers. Highs in the lower 30s. West Winds 15 to 20 Mph with Gusts up to 30 Mph.

Tonight 21 Dec Northern St. Lawrence

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

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Helena Temperature Statistics

December Temperature

Massena, Massena International-Richards Field (5.6 miles)

  • Lowest 9 December, 2025

    -14.1 °F

  • Average December

    20.3 °F

  • Highest 19 December, 2025

    55.9 °F

Climate (2020–Present)

Massena, Massena International-Richards Field (5.6 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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