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Summer tempertures often climb into the upper 90s (F), but nights cool down into the 50s (F) and 60s (F). The thunderstorm season from July through September brings cloudbursts, flash floods and lightning.
Spring and fall are milder with highs generally in the 50s (F) and 60s (F).
Daytime winter highs average less than 50 (F). Snowfall is usually light, especially at lower elevations.
Humidity is low all year.
http://www.nps.gov/care/weather.htm
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