A dry, sunny climate predominates at Lake Roosevelt in the summer months. As you go father north, it becomes cooler and wetter. In the summer temperatures range from 75 to 113 degrees F during the day, and from 50 to 80 degrees F at night. Spring and fall are cooler but still pleasant.The weather can be dramatically different from one end of the lake to the other.
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Last updated: February 12, 2015