If you're visiting Grassy Lake from Havre, you won't be the only one. During the warm months at Grassy Lake highs are frequently in the 80's. For the period of the dark hours of summer temperatures plunge down into the 50's. The winter comes with highs in the 20's with winter lows in the 0's overnight here at Grassy Lake. Grassy Lake gets very little precipitation. Through June this area sees the most rain, and February on the other hand is the driest.
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These outdoors activities are available near Grassy Lake.