Jeff Axel NPS
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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Did You Know?
A common rumor at Lake Roosevelt is that the National Park Service controls the lake level. This is not true. The lake level is controlled by Bureau of Reclamation computers that optimize lake levels for only five things: flood control, power production, irrigation, dam repairs, and salmon runs.