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Winter is a very popular time to go to Lake Louise but visitors are warned that it can get quite cold during this time of year, averaging less than -7°C (20°F) as a normal winter high temperature. The reason that travelers head there despite the cold is because it is an excellent location for enjoying the sport of skiing. There is snow, but there is very little rain, making the slopes excellent for skiers of all skill levels.
Spring is not the best time to visit Lake Louise; the temperatures are still quite cool, with average daytime highs of 13°C (55°F) in May, and 17°C (63°F) in June. Outside of ski season, the glacial blue waters of scenic Lake Louise are the main attraction, but expect the lake to be frozen until about mid-June; the snow is gone by the end of May.
Visitors interested in making Lake Louise a summer travel destination should remember to bring a jacket, as the area remains cool, averaging 20°C (68°F) throughout the warmest months. It may be chilly, but it is not uncomfortable, as humidity is low. The summer daylight hours are long, making it possible to enjoy a long day of activities during a summer stay in the area. The lake itself is best enjoyed during the summer months; if you plan on hiking any of the many short and long trails in the Lake Louise area, make sure to bring clothing for a variety of weather conditions; mountain weather is notorious for its changeability. Overnight lows in summertime average 3°C (16°F).
Autumn is also an excellent time to head to Lake Louise. Tourists empty out of the area, so autumn can be an excellent time to see changing colours of the trees, and to see the lake, which is one of the most beautiful—and busiest—places in the Canadian Rockies. Autumn temperatures are relatively moderate; September's average daily high is 15°C (60°F). Fall is very short here; by October, daily high temperatures have dropped to an average 8°C (46°F). Hikers should keep in mind that in September, the overnight low averages -1°C (30°F); in October, the overnight low is -6°C (21°F).
In terms of events in the area, winter is still the best time to go. More information is online at http://www.tripadvisor.com/Travel-g15... .
For detailed information on temperatures, rainfall, snowfall, snow cover, wind, etc. go to the Environment Canada Lake Louise climate page.
For current temperatures, forecasts, and weather warnings for the Lake Louise area, go to Environment Canada's Banff forecast page. (Click the blue Imperial Units button for weather information in Fahrenheit and inches, if you're not comfortable with metric units.) Keep in mind that since Lake Louise is at a significantly higher elevation than Banff, its temperature will always be a couple of degrees cooler than Banff's.