During the summer, average daily highs are in the range, and occasional intense (but brief) thundershowers occur. As a result of its proximity to water, temperatures above are rare, with an average of only 2.3 days annually above ; one to three years out of each decade will not see any 90 °F readings. The coolest month, January, has a daily high of , with lows normally well above freezing (32 F). The average window for freezing temperatures is from December 12 to March 11 (allowing a growing season of 275 days), between which there is an average of 21 nights with lows at or below the freezing mark. Extremes in temperature range from on January 21, 1985 up to on June 27, 1952.