Climate in Glacier National Park

park's summer season, temperatures during the day can reach as high the 90s Fahrenheit (over 30 degress Celsius), but nighttime lows in the highest elevations can occasionally be around 20 degrees Fahrenheit (less than -5 degrees Celsius). Snow can fall during any part of the year, as demonstrated in August 1992, when a foot of snow fell on the northeastern corner of the park. If you are planning to visit the park during the winter season, expect most of the park to be snow covered, and make sure you have the right gear. Some trails and roads are closed off-season (and bridges removed). Always prepare for a variety of conditions and always bring rain gear.

Wildfires are also a more or less common occurrence in the park. According to the National Park Service, 2003 was one of Glacier's hottest years on record, and large areas of the park were shut down as 144,000 acres burned.

In recent years, the park has become an important case study for climate scientists studying climate change. Research performed by the Northern Rocky Mountain Science Center constructed parallel models of glacial melting and ecosystem change in the park based on a linear temperature extrapolation scenario and a carbon dioxide-induced global warming scenario, and estimated that in the latter case, the park's glaciers would be entirely gone by the year 2030