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Debris from the storm of 2003 (Section 96)

Thunderstorms develop mainly as a result of convection currents caused by the power of the sun and are concentrated in the summer months, with July being the peak. The frequency of thunderstorms diminishes as you head north. Storm clouds usually start to build in the early afternoon, with the storm arriving in the late afternoon or evening.

Yucca at Vasquez Rocks (Section 18)

A thru’-hiker can expect hot, dry weather in Southern California and the High Sierra. Northern California is hiked at the peak of the thunderstorm season but there are fewer here than further south. Oregon in August is generally warm and dry but an occasional frontal storm or thunderstorm can be expected. In Washington in September you can expect periods of frontal rain but you can also get long sunny periods.

The weather’s boring!

Liz Willis, a British thru’-hiker in 2002, after weeks of continuous sunshine in California.

The weather does not always follow these patterns. You must be prepared for rain or snow at any time in the mountains.