Lake Powell water temperatures cool significantly in the winter then rise into the high 70's in the summer. When it does snow at Lake Powell, the contrast of the white against red-rock cliffs and azure blue waters makes for beautiful photographs and memories.
Rain and Flashfloods
Flash floods can turn deadly in Antelope slot canyons and other hiking trails in the Lake Powell, Grand Canyon, Zion, and Bryce Canyon areas. Local as well as distant storms can cause dangerous flash flooding in slot canyons, and expert guides advise avoiding hiking in them if there is any sign of rain. Even if there is very little rain falling in your specific location, a wall of accumulated water can suddenly appear and rush through the many small canyons in the area.