Flat Lick Stream Valley Park Weather Forecast

    • 35
    • 46

    Increasing Clouds

    • 23
    • 50

    Partly Sunny

    • 31
    • 41

    Mostly Cloudy

    • 37
    • 53

    Mostly Cloudy

    • 37
    • 50

    Mostly Cloudy

    • 48
    • 58

    Mostly Cloudy

Today 20 Dec Eastern Loudoun

Sunny. Highs in the mid 40s. South Winds 5 to 10 Mph.

Tonight 20 Dec Eastern Loudoun

Mostly clear in the Evening, then becoming partly cloudy. Lows in the mid 30s. Southwest Winds 5 to 10 Mph with Gusts up to 20 Mph.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Flat Lick Stream Valley Park Temperature Statistics

December Temperature

Washington/Dulles International Airport, DC (4.3 miles)

  • Lowest 9 December, 2025

    14 °F

  • Average December

    31.6 °F

  • Highest 17 December, 2025

    50 °F

Climate (2020–Present)

Washington/Dulles International Airport, DC (4.3 miles)

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  • Average Low 2020–2025

    47.6 °F

  • Average 2020–2025

    58.2 °F

  • Average High 2020–2025

    68.4 °F
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