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Most of the park's 1 million annual visitors still come between late fall and early spring, taking advantage of moderate temperatures and the lack of rainfall. During these cooler months you will need to book a room in advance, but don't worry: the park never feels crowded. If you visit in summer, believe everything you've ever heard about desert heat—it can be brutal, with temperatures often topping 120°F. The dry air wicks moisture from the body without causing a sweat, so drink plenty of water. Bring sunglasses, a hat, and sufficient clothing to block the sun's rays and the wind. Flash floods are fairly common; sections of roadway can be flooded or washed away. The wettest month is February, when the park receives an average of 0.3 inch of rain.