Winters are cool, cloudy, and rainy. The coldest month is December with an average daily high of , although overnight lows usually remain above freezing by a few degrees. Evening temperatures fall to or below freezing 32 nights per year on average, but very rarely to or below . There are only 2.1 days per year where the daytime high temperature fails to rise above freezing. The lowest overnight temperature ever recorded was , on February 2, 1950, while the coldest daytime high temperature ever recorded was on December 30, 1968. The average window for freezing temperatures to potentially occur is between November 15 and March 19, allowing a growing season of 240 days.