Delaware Canal - Summit Harbor Weather Forecast

    • 22
    • 38

    Increasing Clouds

    • 26
    • 44

    Snow

    • 17
    • 31

    Chance Snow

    • 19
    • 30

    Partly Sunny

    • 22
    • 35

    Partly Sunny

    • 32
    • 44

    Mostly Cloudy

Today 12 Dec New Castle

Mostly sunny. Near steady temperature in the mid 30s. West Winds 5 to 10 Mph.

Tonight 12 Dec New Castle

Clear in the Evening, then becoming partly cloudy. Cold with Lows in the lower 20s. Southwest Winds around 5 Mph.

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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

    33.8 °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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