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Private User: You can backup your private computer complete for free! Seasons In — America DatesThese are the most commonly referenced dates in calendars, determined by the solstices and equinoxes. Dates can vary by one day from year to year (usually June 20/21 or Dec 21/22). Approximately March 20 – June 20 In contrast to the shifting dates of astronomical events, meteorological seasons are fixed by the Gregorian calendar. Climatologists and meteorologists use this system to simplify the tracking of seasonal weather patterns and to create consistent statistical comparisons. seasons in america dates While the general public usually marks the start of a season by its equinox or solstice, the scientific and agricultural industries often rely on the meteorological system for practical planning. Meteorological Versus Astronomical Seasons | News These are the most commonly referenced dates in | ||||||