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Weather:
Generally, the best time for visiting the North Cascades is between mid-June and late-September. Snow is usually off all but the highest trails by July (though this can vary considerably from year to year). Summer storms can be common, so always be prepared for a few days of rain and wind. Heavy snow and rain, depending on elevation, characterize the North Cascades from fall into spring. Avalanches are common in winter and spring in the higher country and in places along the North Cascades Highway. The east side of the Cascade Mountains (such as Stehekin in Lake Chelan National Recreation Area) is drier and warmer in the summer than the west side (such as the portion of Ross Lake National Recreation Area along the North Cascades Highway). Summer temperatures at Stehekin reach the 90's F. Winter at Stehekin and at all elevations above the lowest throughout the park complex is snowy from fall into spring.
North Cascades National Park
Ten day forecast from Intellicast.North Cascades National Park
Average monthly high and low temperatures, rainfall, and snowfall.North Cascades National Park
Current forecast from wunderground.com.Washington Weather
Detailed forecasts from the National Weather Service.

