The first day of spring is determined by two primary calendars. Astronomically, spring begins on the vernal equinox (typically March 19 to 21 in the Northern Hemisphere), when the sun crosses the celestial equator, providing nearly equal hours of day and night. Meteorologists define spring as starting on March 1, grouping March, April, and May together to simplify seasonal climate data analysis and historical temperature reporting.
1 votes
Marked as accepted