The January daily average is 33.0 °F (0.6 °C), though, in a normal winter, the temperature frequently rises to 50 °F (10 °C) during thaws and dips to 10 °F (−12 °C) for 2 or 3 nights. July averages 78.1 °F (25.6 °C), although heat waves accompanied by high humidity and heat indices are frequent; highs reach or exceed 90 °F (32 °C) on 27 days of the year. The average window for freezing temperatures is November 6 thru April 2, allowing a growing season of 217 days. Early fall and late winter are generally dry; February's average of 2.64 inches (67 mm) makes it the area's driest month. The dewpoint in the summer averages between 59.1 °F (15 °C) to 64.5 °F (18 °C).