As you go higher, the wind increases, too. So pack for the weather at the top. Mountain weather can change fast. So even on a fine day, bring raingear, a hat, and gloves and one more warm layer than you think you'll need. Keep your warm clothes and raingear where you can get at them fast.
Wet days are hypothermia days.
Temperatures as high as 50 degrees can be dangerous if there is mist or rain and wind. Plan plenty of time to acclimate, and if you feel headachy or nauseated, stop climbing until you feel better. If you don't feel better, go down. More High Country For exciting activities and destinations, helpful how-tos, and essential gear, check out GORP's highland roundup . In many mountain systems, thunder and lightning roll in during the afternoons .