Delaware Canal - Summit Harbor Weather Forecast

    • 24
    • 49

    Slight Chance Snow

    • 29
    • 33

    Wintry Mix

    • 27
    • 39

    Chance Snow

    • 36
    • 43

    Rain

    • 25
    • 56

    Rain Likely

    • 24
    • 35

    Mostly Cloudy

    • 24
    • 38

    Mostly Cloudy

Today 25 Dec New Castle

Partly sunny. A slight chance of rain this morning. Highs in the upper 40s. Southwest Winds 5 to 10 Mph, becoming northwest this afternoon. Chance of rain 20 percent.

Tonight 25 Dec New Castle

Partly cloudy this Evening, then becoming mostly clear. Cold with Lows in the mid 20s. North Winds 5 to 10 Mph.

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Delaware Canal - Summit Harbor Temperature Statistics

December Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 16 December, 2025

    16 °F

  • Average December

    33.6 °F

  • Highest 19 December, 2025

    55.9 °F

Climate (2020–Present)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2020–2025

    48 °F

  • Average 2020–2025

    57.3 °F

  • Average High 2020–2025

    66.5 °F
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