Yellowknife has a subarctic climate which means there are twenty hours of sunshine in summer and just about 5 hours of it in winter. Biting cold winters give way to sunny, welcoming summers that bring with it lots of hustle-bustle and smiling faces. Without a doubt, the best time to visit Yellowknife is during summer, in the months of June to September.
Winters: To really experience the chill of winter, head to the North Western Territory. Winter months start from late October to February and beginning of March too. The winter weather in Yellowknife is drier than most southern places; there is less moisture in the air, which means when you might not feel the cold but you can still get frost bite. Winter temperatures can fall down to -20 degree Celsius on an average and even spring sees temperatures drop to approximately -10 degree Celsius during the night.
Summers: Yellowknife is one of the sunniest places in Canada. Summers bring sunshine for almost 20-22 hours and average temperatures of 20 degree Celsius. Humidity can cause you to feel summers are more severe than they really are. During summer average high temperatures are 19 degree Celsius and average low temperatures are 10.1 degree Celsius.
Rain/Snow: The annual precipitation averages about 300 mm. The month of August has the most rainfall. The first snowfall of autumn for Yellowknife usually arrives in September or October, but can show up as early as August.
The season's last snowfall typically happens in April or May, although in some years a late snow lands in June.
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