Try to avoid overexposing yourself to intense sun. You can do this by wearing a hat and a long-sleeved shirt. Save strenuous activities for cooler times of the day during hotter times of the year.
Temperatures drop well below freezing in the winter.
In the high desert, hypothermia can be a hazard in fall, winter and spring. Be sure to carry some warm clothing and something to keep you dry if a storm came up. Snow can cover trail markings this making it nearly impossible to find the route.