Roy Lake Weather Forecast

    • -4
    • 4

    Chance Snow

    • -2
    • 29

    Chance Snow

    • -11
    • 4

    Chance Snow

    • -6
    • 3

    Cold

    • -5
    • 8

    Cold

    • -3
    • 13

    Mostly Cloudy

Today 29 Dec Mahnomen

Mostly sunny. Highs zero to 5 above. Northwest Winds around 15 Mph becoming west around 5 Mph in the afternoon.

Tonight 29 Dec Mahnomen

Mostly cloudy. A slight chance of light snow after midnight. Lows zero to 5 below. Southwest Winds 5 to 15 Mph. Chance of snow 20 percent.

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  • Temperature Forecast NOAA

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Roy Lake Temperature Statistics

December Temperature

Mahnomen County Airport (18 miles)

  • Lowest 13 December, 2025

    -21.6 °F

  • Average December

    11.3 °F

  • Highest 16 December, 2025

    43.7 °F

Climate (2020–Present)

Mahnomen County Airport (18 miles)

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  • Average Low 2020–2025

    32.3 °F

  • Average 2020–2025

    42 °F

  • Average High 2020–2025

    51.4 °F
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