Glacier's western valleys generally receive the most rainfall. Daytime temperatures can exceed 90�F. It is frequently 10 to 15 degrees cooler at higher elevations. Strong winds and sunny days predominate on the east side of the park. Overnight lows throughout the park can drop to near 20�F, and snow can fall anytime. In August of 1992, a foot of snow fell on the northeastern corner of Glacier.
Prepare for a variety of conditions and pack accordingly. You may start the day in a T-shirt and shorts, and need a parka by evening. Dress in layers. Always bring raingear.
During the summer months of June, July, and August, daytime temperatures average in the 60�s and 70�s. Nighttime temperatures average in the 40�s. These are merely averages and daytime highs can exceed 90�F and overnight lows can drop to near 20�F. Snow can fall anytime, especially in areas above the treeline, where it is frequently 10 to 15 degrees cooler.
Summer rainfall averages two to three inches per month
|Avg High - �F||28.3||34.7||41.8||52.8||64.1||71.3||79.2||77.8||66.6||52.5||37.1||30.0||53.1|
|Avg Low - �F||14.6||18.5||22.6||29.8||37.0||43.7||47.3||46.1||38.8||31.8||24.7||18.3||31.1|
|Avg Precip (in)||3.37||2.34||1.84||1.81||2.60||3.26||1.74||1.67||2.06||2.34||3.12||3.28||29.42|
|Avg Snowfall (in)||39.6||22.7||14.7||3.4||0.5||0.2||0.0||0.0||0.1||2.1||18.0||38.0||139.2|
|Avg Snow Depth (in)||18.0||21.0||18.0||5.0||0.0||0.0||0.0||0.0||0.0||0.0||3.0||9.0||6.0|
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