Sullivan Lake Weather Forecast

    • 33
    • 43

    Snow Likely

    • 31
    • 38

    Rain/Snow

    • 27
    • 38

    Slight Chance Snow

    • 26
    • 37

    Slight Chance Snow

    • 27
    • 35

    Chance Snow

    • 27
    • 35

    Chance Rain/Snow

Today 17 Dec Waterville Plateau

A chance of rain in the morning. Partly sunny with a chance of snow. Highs in the lower to mid 40s. Very windy. Southwest wind 30 to 45 Mph. Gusts up to 70 Mph decreasing to 50 Mph in the afternoon. Chance of precipitation 20 percent.

Tonight 17 Dec Waterville Plateau

Mostly cloudy. A chance of snow overnight. Lows in the lower to mid 30s. Breezy. Southwest wind 10 to 20 Mph. Gusts up to 35 Mph in the evening. Chance of precipitation 20 percent.

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Sullivan Lake Temperature Statistics

December Temperature

Ephrata, Ephrata Municipal Airport (28.6 miles)

  • Lowest 2 December, 2025

    26.1 °F

  • Average December

    40.4 °F

  • Highest 10 December, 2025

    64 °F

Climate (2020–Present)

Ephrata, Ephrata Municipal Airport (28.6 miles)

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  • Average Low 2020–2025

    42.4 °F

  • Average 2020–2025

    53.5 °F

  • Average High 2020–2025

    63.8 °F
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