Graves Reservoir Weather Forecast

    • 31
    • 52

    Partly Sunny

    • 34
    • 56

    Partly Sunny

    • 33
    • 58

    Partly Sunny

    • 30
    • 58

    Mostly Sunny

    • 29
    • 59

    Mostly Sunny

    • 31
    • 59

    Mostly Sunny

Today 8 Dec Modoc County

Partly cloudy. Highs in the lower to mid 50s. South Winds around 5 Mph shifting to the southwest in the afternoon.

Tonight 8 Dec Modoc County

Mostly cloudy in the evening then becoming partly cloudy. Lows in the lower to mid 30s. Southwest Winds 10 to 15 Mph.

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Graves Reservoir Temperature Statistics

December Temperature

Alturas (9.3 miles)

  • Lowest 1 December, 2025

    15.1 °F

  • Average December

    35.4 °F

  • Highest 1 December, 2025

    51.1 °F

Climate (2020–Present)

Alturas (9.3 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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