Greenhorn Reservoir Weather Forecast

    • 40
    • 44

    Rain

    • 33
    • 50

    Rain

    • 32
    • 47

    Chance Rain

    • 37
    • 43

    Rain

    • 33
    • 45

    Rain Likely

    • 31
    • 47

    Rain Likely

    • 28
    • 47

    Chance Rain

Today 20 Dec Central Siskiyou County

Mostly cloudy with a 40 percent chance of rain. Snow level 3500 feet. Highs in the lower to mid 40s. Northeast Winds 5 to 10 Mph shifting to the south late this afternoon.

Tonight 20 Dec Central Siskiyou County

Rain likely this Evening, then rain after midnight. Snow level 6000 feet this evening. Lows in the mid 30s to lower 40s. Southwest Winds 5 to 10 Mph shifting to the southeast 10 to 15 Mph late this evening and overnight. Chance of rain 90 percent.

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Greenhorn Reservoir Temperature Statistics

December Temperature

Montague Siskiyou County Airport (9.9 miles)

  • Lowest 14 December, 2025

    21 °F

  • Average December

    37.4 °F

  • Highest 6 December, 2025

    57.9 °F

Climate (2020–Present)

Montague Siskiyou County Airport (9.9 miles)

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  • Average Low 2020–2025

    39.7 °F

  • Average 2020–2025

    54.2 °F

  • Average High 2020–2025

    68.9 °F
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