Big Arm Unit - Flathead Lake State Park

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Availability

Each day shows how many of this campground’s sites are open.

About this spot

Typical weather

Flathead Lake

Average water temperature
Average water temperature for Flathead Lake, January through DecemberEach point shows the monthly average water temperature in degrees Fahrenheit.37°JJanuary: average water temperature 37°F36°FFebruary: average water temperature 36°F38°MMarch: average water temperature 38°F43°AApril: average water temperature 43°F46°MMay: average water temperature 46°F53°JJune: average water temperature 53°F58°JJuly: average water temperature 58°F59°AAugust: average water temperature 59°F55°SSeptember: average water temperature 55°F52°OOctober: average water temperature 52°F44°NNovember: average water temperature 44°F35°DDecember: average water temperature 35°F

Water: Water Quality Portal — 23 field-sample stations

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