"Spring is one of the four conventional temperate seasons, following winter and preceding summer. There are various technical definitions of spring, but local usage of the term varies according to local climate, cultures and customs. When it is spring in the northern hemisphere, it will be autumn in the southern hemisphere. At the spring equinox, days are close to 12 hours long with day length increasing as the season progresses. Spring and "springtime" refer to the season, and also to ideas of rebirth, rejuvenation, renewal, resurrection, and regrowth."
Spring is the season that marks the transition from winter to summer.
The Vernal Equinox is an astronomical event in which the daytime and nighttime are both 12 hours long. In many cultures, this is also considered the first day of spring.