Groton Weather Forecast

    • 13
    • 24

    Increasing Clouds

    • 19
    • 38

    Slight Chance Snow

    • 15
    • 34

    Mostly Cloudy

    • 3
    • 24

    Mostly Sunny

    • 20
    • 30

    Chance Snow

    • 31
    • 42

    Chance Snow

Today 5 Dec Northwest Middlesex County

Mostly sunny and Colder. Near steady temperature in the lower 20s. South Winds around 5 Mph.

Tonight 5 Dec Northwest Middlesex County

Mostly cloudy. Not as cool with Lows around 14. South Winds around 5 Mph in the Evening, becoming light and variable.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Groton Temperature Statistics

December Temperature

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

  • Lowest 1 December, 2025

    19 °F

  • Average December

    29.9 °F

  • Highest 1 December, 2025

    39.9 °F

Climate (2020–Present)

Fitchburg, Fitchburg Municipal Airport (9.9 miles)

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  • Average Low 2020–2025

    41.8 °F

  • Average 2020–2025

    51.8 °F

  • Average High 2020–2025

    61.7 °F
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