The weather in Jasper National Park is ever-changing and always unpredictable. Visitors should be prepared for the icy winds that can blow off a glacier in mid-summer, and for the chinooks that can warm a January day to above freezing.
Summer days are long, but the summer season is short.
July is the warmest month with a mean daily maximum temperature of 22.5 degrees Celsius. September and October bring fall colours, clear skies and cooler temperatures. The long winter season is varied with periods of cold stormy weather that can quickly change to a mild chinook wind. January is the coldest month with a mean maximum temperature of -9.4 degrees Celsius. In mountainous terrain, a number of factors contribute to climate and weather patterns and create a variety of micro-climates.