Round Valley Reservoir Weather Forecast

    • 25
    • 38

    Decreasing Clouds

    • 32
    • 46

    Partly Sunny

    • 35
    • 52

    Partly Sunny

    • 33
    • 50

    Partly Sunny

    • 33
    • 51

    Partly Sunny

    • 34
    • 52

    Partly Sunny

    • 37
    • 54

    Partly Sunny

Today 3 Dec Lassen-Eastern Plumas-Eastern Sierra Counties

Partly cloudy. Highs 41 to 46. East Winds 10 to 15 Mph.

Tonight 3 Dec Lassen-Eastern Plumas-Eastern Sierra Counties

Partly cloudy in the evening then becoming clear. Lows 16 to 26. Light Winds.

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Round Valley Reservoir Temperature Statistics

December Temperature

Alturas (67.1 miles)

  • Lowest 1 December, 2025

    15.1 °F

  • Average December

    34.8 °F

  • Highest 1 December, 2025

    51.1 °F

Climate (2020–Present)

Alturas (67.1 miles)

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  • Average Low 2020–2025

    33.2 °F

  • Average 2020–2025

    49.2 °F

  • Average High 2020–2025

    64.3 °F
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