Generally, the best weather 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 greatly from year to year). Summer storms are common in this period: always be prepared for a few days of rain and wind. Particularly if you are going into high and remote areas, take good, light rain gear and a tent. Warm, waterproof clothing and a tent are virtually mandatory for spring, fall and winter trips into the backcountry. 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.
|Avg High - �F||37.6||42.9||48.9||57.0||65.6||70.3||77.1||77.2||70.7||58.1||44.9||38.9||57.5|
|Avg Low - �F||27.4||29.9||32.5||37.0||43.0||48.3||52.1||52.5||48.0||41.0||34.1||30.0||39.7|
|Avg Precip (in)||11.12||8.57||6.75||4.64||2.77||2.23||1.55||1.56||3.46||7.86||12.04||12.40||74.93|
|Avg Snowfall (in)||21.4||12.5||5.0||0.2||0.0||0.0||0.0||0.0||0.0||0.0||3.9||15.0||58.0|
|Avg Snow Depth (in)||6.0||5.0||1.0||2.0||0.0||0.0||0.0||0.0||0.0||0.0||0.0||2.0||1.0|
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