Ralph B Clark Regional Park Weather Forecast

    • 53
    • 79

    Mostly Sunny

    • 54
    • 83

    Mostly Sunny

    • 53
    • 82

    Mostly Sunny

    • 53
    • 81

    Mostly Sunny

    • 54
    • 80

    Partly Sunny

    • 53
    • 76

    Partly Sunny

Today 8 Dec Orange County Inland

Mostly sunny. Highs around 77 towards the coast to 80 farther inland. Areas of Winds northwest 10 to 15 Mph with Gusts to 30 Mph.

Tonight 8 Dec Orange County Inland

Clear. Lows 50 to 55. Areas of Winds northeast 10 to 20 Mph. Gusts to 35 Mph. Becoming 30 Mph overnight.

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Ralph B Clark Regional Park Temperature Statistics

December Temperature

Fullerton, Fullerton Municipal Airport (1.2 miles)

  • Lowest 5 December, 2025

    45 °F

  • Average December

    59.1 °F

  • Highest 1 December, 2025

    72 °F

Climate (2020–Present)

Fullerton, Fullerton Municipal Airport (1.2 miles)

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  • Average Low 2020–2025

    56.8 °F

  • Average 2020–2025

    66 °F

  • Average High 2020–2025

    76.4 °F
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