Autumn, winter, and early spring are frequently characterized by rain. Winters are cool and wet with December, the coolest month, averaging 40.6 °F (4.8 °C), with 28 annual days with lows that reach the freezing mark, and 2.0 days where the temperature stays at or below freezing all day; the temperature rarely lowers to 20 °F (−7 °C). Summers are sunny, dry and warm, with August, the warmest month, averaging 66.1 °F (18.9 °C), and with temperatures reaching 90 °F (32 °C) on 3.1 days per year, although 2011 is the most recent year to not reach 90 °F. The hottest officially recorded temperature was 103 °F (39 °C) on July 29, 2009; the coldest recorded temperature was 0 °F (−18 °C) on January 31, 1950; the record cold daily maximum is 16 °F (−9 °C) on January 14, 1950, while, conversely, the record warm daily minimum is 71 °F (22 °C) the day the official record high was set. The average window for freezing temperatures is November 16 thru March 10, allowing a growing season of 250 days.