There are several
There are several interpretations as to when each season begins. In North America, calendars commonly use the astronomical definition. It is true that various countries, cultures, religions, organizations, and individuals may use definitions other than the astronomical. Because we are an almanac that provides astronomical data, however, that’s why we use the astronomical definition. For our weather predictions, however, we start with a more meteorological definition by providing Nov-March “winter” predictions, Apr-May for spring, June-Aug for summer and Sept/Oct for fall. Hope this is helpful. --Your OFA editors