Mertz Reservoir Weather Forecast

    • 32
    • 48

    Slight Chance Snow Showers

    • 49
    • 59

    Windy

    • 41
    • 62

    Windy

    • 45
    • 65

    Mostly Cloudy

    • 46
    • 65

    Breezy

    • 43
    • 62

    Breezy

Today 20 Dec Central Laramie Range and Southwest Platte County

Mostly cloudy early this Morning, then clearing. Snow Showers likely Late, then a chance of snow Showers this morning. A slight chance of snow Showers this afternoon. Little or no snow accumulation. Windy and much cooler with Highs in the lower 40s. Northwest Winds 20 to 30 Mph, becoming west this afternoon. Gusts up to 45 Mph. Chance of snow 60 percent.

Tonight 20 Dec Central Laramie Range and Southwest Platte County

Mostly clear in the Evening, then becoming partly cloudy. Breezy, cold with Lows around 30. Southwest Winds 15 to 25 Mph with Gusts up to 35 Mph.

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Mertz Reservoir Temperature Statistics

December Temperature

Camp Guernsey (28.6 miles)

  • Lowest 1 December, 2025

    4.8 °F

  • Average December

    39.1 °F

  • Highest 16 December, 2025

    65.5 °F

Climate (2020–Present)

Camp Guernsey (28.6 miles)

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  • Average Low 2020–2025

    35.7 °F

  • Average 2020–2025

    49.3 °F

  • Average High 2020–2025

    62.8 °F
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