Delaware Canal - Summit Harbor Weather Forecast

    • 26
    • 45

    Patchy Fog

    • 43
    • 48

    Rain

    • 25
    • 56

    Rain Showers Likely

    • 34
    • 41

    Partly Sunny

    • 25
    • 49

    Mostly Sunny

    • 26
    • 38

    Partly Sunny

    • 34
    • 44

    Slight Chance Rain

Today 17 Dec New Castle

Partly sunny and not as cool. Near steady temperature in the mid 40s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

Tonight 17 Dec New Castle

Mostly cloudy. Patchy freezing fog after midnight. Cold with Lows in the upper 20s. West Winds around 5 Mph, becoming north around 5 Mph after midnight.

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Delaware Canal - Summit Harbor Temperature Statistics

December Temperature

Wilmington, New Castle County Airport (10.6 miles)

  • Lowest 9 December, 2025

    17.1 °F

  • Average December

    32.3 °F

  • Highest 1 December, 2025

    45 °F

Climate (2020–Present)

Wilmington, New Castle County Airport (10.6 miles)

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  • Average Low 2020–2025

    48.1 °F

  • Average 2020–2025

    57.3 °F

  • Average High 2020–2025

    66.5 °F
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