In 2014 the summer season lasted 93 days. According to The Old Farmer's Almanac, the Summer Solstice falls on June 21 and the Autumnal Equinox falls on Sept. 21.
The summer solstice marks the beginning of summer for the Northern Hemisphere. On this day you will experience the highest number of daylight hours for the whole year. After this, each day becomes progressively shorter until the autumnal equinox begins, marking the first day of fall for the Northern Hemisphere. The precise dates for these events can vary slightly depending depends on the sun's position relative to the equator, but they occur at approximately the same time each year.