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Vernal Equinox is the firstVernal Equinox is the first day of Spring based on astronomical data. The same applies to other astronomical seasons, it may not feel at all like Spring, but the position of the Sun and the Earth dictate the astronomical time frame, not the weather conditions in a particular area. If we went by how the temperatures feel and what the weather conditions are, there would be no rhyme nor reason to calculating the seasons. It might be Spring in one state and Winter in the next, while further South it might already be Summer.

2015 Special Edition Garden GuideCooking Fresh with The Old Farmer's AlmanacThe Almanac Monthly Digital MagazineWhat the heck is a Garden Hod?