Threemile Reservoir Weather Forecast

    • 37
    • 58

    Increasing Clouds

    • 34
    • 60

    Mostly Sunny

    • 38
    • 57

    Partly Sunny

    • 42
    • 57

    Chance Rain

    • 37
    • 56

    Rain

    • 35
    • 48

    Rain/Snow Likely

    • 37
    • 49

    Rain/Snow Likely

Today 12 Dec Harney County

Mostly sunny. Highs 51 to 58. Light Winds.

Tonight 12 Dec Harney County

Partly cloudy. Patchy fog after midnight. Lows 21 to 34. Light Winds.

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  • Temperature Forecast NOAA

  • Temperature Real-Time

Threemile Reservoir Temperature Statistics

December Temperature

Rome (53.4 miles)

  • Lowest 1 December, 2025

    14 °F

  • Average December

    41.6 °F

  • Highest 10 December, 2025

    66 °F

Climate (2020–Present)

Rome (53.4 miles)

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  • Average Low 2020–2025

    36.7 °F

  • Average 2020–2025

    51.5 °F

  • Average High 2020–2025

    65.8 °F
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