Sullivan Lake State Airport Weather Forecast

    • 23
    • 38

    Mostly Sunny

    • 24
    • 36

    Partly Sunny

    • 22
    • 37

    Partly Sunny

    • 24
    • 36

    Mostly Cloudy

    • 24
    • 35

    Chance Snow

    • 15
    • 32

    Chance Snow

    • 17
    • 24

    Chance Snow

Today 18 Jan Northeast Mountains

Mostly sunny. Highs in the mid to upper 30s.

Tonight 18 Jan Northeast Mountains

Partly cloudy. Lows in the lower to mid 20s.

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Sullivan Lake State Airport Temperature Statistics

January Temperature

Boundary County Airport (45.4 miles)

  • Lowest 1 January, 2026

    19.4 °F

  • Average January

    33.4 °F

  • Highest 12 January, 2026

    44.6 °F

Climate (2021–Present)

Boundary County Airport (45.4 miles)

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  • Average Low 2021–2026

    37.7 °F

  • Average 2021–2026

    47.2 °F

  • Average High 2021–2026

    56.7 °F
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