Spring: March 1-May 31; Summer: June 1-August 31; Fall: September 1-November 30; Winter: December 1-February 28 (29)
You may have noticed that Arbor Doctor, meteorologists and climatologists define seasons differently from “regular” or astronomical spring, summer, fall, and winter. So, why do meteorological and astronomical seasons begin and end at different times? Climatologically, the period July 14-21, the mid-point of meteorological summer, is the hottest week of the year and the period January 14-21, the mid-point of meteorological winter, is the coldest week of the year over much of the continental US including the Ohio valley.