Big Grassy Lake gets a good deal of water. Of all the months in a year April is the one with the most rain, and August meanwhile is the driest month. For the duration of the warm months, highs usually are in the 90's at Big Grassy Lake, and during the night it cools down to the 70's. For the duration of the winter highs are in the 40's with temperatures at Big Grassy Lake dipping down into the 20's during winter nights.
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These outdoors activities are available near Big Grassy Lake.