Winters are usually cold but not severe. The valley is protected somewhat from cold Canadian air masses by the mountains. Spring is the wettest season of the year. May. Only one year in ten receives less than two-thirds of the expected moisture supply during these months. Summer arrives abruptly the first part of June with warmer and drier weather.
Nights are cool and humidity low in the daytime.
Crisp, cool weather accompanies the fall season in September. The average growing season extends for 159 days, from May 8th to October 13th. Spring frosts tend to linger on, which shortens the growing season. There is a 50 percent probability of freezing temperatures after the first week in May, and temperatures of 32 degrees or lower have been recorded as late as June 12th. Fall frosts can be expected early, usually before mid-October.