There is almost an 8,000 foot (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 snowpack may not have melted at high 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. Weather conditions are highly variable. Please come prepared for all types of weather. It can snow any time of the year at high elevations.