Glacier National Park from Apgar Lookout
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Weather

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Summer Weather
Glacier's western valleys generally receive the most rainfall. Daytime temperatures can exceed 90 degrees 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 degrees 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.
                       
Precipitation

Jan

 Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
                                                 
30 year average (inches) 3.40 2.37 1.86 1.81 2.57 3.28 1.75 1.64 2.06 2.33 3.10 3.30
30 year low (inches) 0.16 0.33 0.43 0.27 0.91 0.75 0.00 0.00 0.02 0.08 0.65 0.68
30year high (inches) 7.07 5.10 4.13 3.45 6.13 6.94 5.11 5.14 6.17 5.87 7.53 7.72
 
Average Number of days with precipitation (rain and/or snow) over 0.01 inches 17 13 13 11 13 13 9 9 9 11 15 17
   

Average snowfall (inches)

 39.6 22.5 14.5 3.5 0.4 0.2 0 0 0.1 2.0 17.2 37.5
Temperature Jan Feb Mar Apr May Jun Jul Aug Sep Oct Nov Dec
 
Average Maximum Temperature 28.5 34.7 41.9 52.9 64.1 71.2 79.1 78.1 66.7 52.7 37.3 30.0
                                                 
Average Minimum Temperature 14.9 18.8 22.9 29.7 37.1 43.7 47.2 46.3 38.8 31.8 24.9 18.4
                                               

Maximum High Temperature

50 58 66 83 90 91 99 99 95 77 65 52
                                                 
Maximum Low Temperature -35 -32 -30 3 13 24 31 26 18 -3 -29 -36
   
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