I Average Temperatures I Average Precipitation I. Climate. There is almost an 8,000 ft (2,400 m) difference in elevation between Wheeler Peak and the valley floor. Weather conditions in the park vary with elevation. In late spring and early summer, days in the valley may be hot, yet the snow pack may not have melted in the higher elevations. The Great Basin is a desert, with low relative humidity and sharp drops in temperature at night. In the summer, fierce afternoon thunderstorms are common. It can snow any time of the year at high elevations.