Pennington / Prospect Weather Forecast

    • 29
    • 38

    Increasing Clouds

    • 23
    • 45

    Partly Sunny

    • 27
    • 39

    Partly Sunny

    • 33
    • 43

    Slight Chance Rain

    • 28
    • 45

    Mostly Cloudy

    • 41
    • 49

    Chance Rain

Today 20 Dec Mercer

Sunny in the Morning, then becoming partly sunny. Much cooler with Highs in the upper 30s. Southwest Winds 5 to 10 Mph.

Tonight 20 Dec Mercer

Mostly clear and much Colder. Near steady temperature in the mid 20s. West Winds 10 to 15 Mph with Gusts up to 25 Mph.

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Pennington / Prospect Temperature Statistics

December Temperature

Trenton, Mercer County Airport (3.1 miles)

  • Lowest 9 December, 2025

    10.9 °F

  • Average December

    29.8 °F

  • Highest 17 December, 2025

    44.1 °F

Climate (2020–Present)

Trenton, Mercer County Airport (3.1 miles)

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  • Average Low 2020–2025

    46.1 °F

  • Average 2020–2025

    55.3 °F

  • Average High 2020–2025

    64.3 °F
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