Blackrock Mountain Weather Forecast

    • 32
    • 53

    Partly Sunny

    • 33
    • 51

    Mostly Sunny

    • 32
    • 55

    Mostly Sunny

    • 33
    • 55

    Mostly Sunny

    • 32
    • 47

    Partly Sunny

    • 29
    • 46

    Slight Chance Rain/Snow

    • 28
    • 47

    Partly Sunny

Today 16 Dec South End of the Upper Sierra

Mostly sunny. Highs 53 to 63. Northwest Winds up to 5 Mph shifting to the west in the afternoon.

Tonight 16 Dec South End of the Upper Sierra

Partly cloudy. Lows 35 to 47. Northwest Winds up to 10 Mph. Gusts up to 30 Mph after midnight.

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Blackrock Mountain Temperature Statistics

December Temperature

Porterville, Porterville Municipal Airport (44.7 miles)

  • Lowest 2 December, 2025

    35.1 °F

  • Average December

    43.5 °F

  • Highest 12 December, 2025

    54 °F

Climate (2020–Present)

Porterville, Porterville Municipal Airport (44.7 miles)

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  • Average Low 2020–2025

    51.5 °F

  • Average 2020–2025

    64.9 °F

  • Average High 2020–2025

    79 °F
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