WEATHER AND CLIMATE
Average summer daytime temperatures range from 90 °F (32 °C) to over 100 °F (38 °C). Because the clear skies of the park allow for cooling at night, summer lows are sometimes 40 °F(22 °C) below the daily highs. July is the warmest month, with an average high of 92 °F (33 °C) and an average low of 60 °F (16 °C). January is the coldest month, when highs average 48 °F(9 °C) and lows average 21 °F (−6 °C). The highest recorded temperature was 107 °F (42 °C) in 1998, and the lowest was −27 °F (−33 °C) in 1971.
Winter winds can reach 60 miles per hour (97 km/h)Summer breezes are lighter, but the 10-mile-per-hour (16 km/h) average wind causes frequent sandstorms