The date for the start of the astronomical spring season each year is called the Vernal Equinox, one of two days on which the overhead path of the Sun moves across the equator. The actual date depends on one's location north or south of the equator, and will shift due to the 1/4 days by which the orbital year exceeds the calendar year.
For the Northern Hemisphere, the Vernal Equinox is the "March Equinox," which for most of the early 21st century (2001-2006 and 2008-2017) will be March 20.
This is the Autumnal Equinox south of the equator.
For the Southern Hemisphere, the Vernal Equinox is the "September Equinox," which falls on September 23 (2010-2011) or September 22 (2012-2013).
The first climatological day of spring, as mandated by the World Meteorological Organization, is March 1 every year in the northern hemisphere and September 1 every year in the Southern Hemisphere.
Canada, the USA, and some European countries customarily observe the astronomical date (ca. March 20-21/ca. September 22-23) while Australia, New Zealand, and some other European countries follow the climatological date (March 1/September 1). Customary dates are often declared "official" by the mass media although no legal basis exists for this designation. Preferences for the astronomical or climatological dates vary in other countries. Lunar dates are used across much of east Asia to determine the beginning of spring.
The ecological beginning of spring (vernal season) has no fixed dates but is marked locally by the beginning of the growing season for most plants when the local mean daily temperature reaches 6 degrees C/42 degrees F. Many ecologists also recognize a pre-spring (prevernal) season that precedes spring. Pre-spring is a transitional time at the end of winter when only the hardiest plants like the crocus begin to bloom.
Tropical regions of the Earth do not have a spring season.
Tuesday, 20 March 2012 is the first day of spring
The first day of spring in 1960 was March 20.
In the northern hemisphere, the first day of Spring in 2016 is on 20 April, while in the year 2023 it is on 21 March. In the southern hemisphere, the first day of Spring is always 1 September, and not on the vernal equinox.
20th march
The word is "equinoctial" = equal day and night. It occurs twice a year, on the first day of Spring, and the first day of Autumn.
The first day of spring.
The first day of spring is called vernal equinox!
The Vernal Equinox determines the first day of spring. The Autumn Equinox is what determines the first day of fall.
The Scientific name for the first day of spring is the Vernal Equinox!
The first day of spring in 2008 was March 20th.
The first day of spring in 2014 will fall on March 20th. This will be a Thursday.
The first day of Spring in 2019 falls on a Wednesday. This will be Wednesday, March 20th and is known as the Spring Equinox.
The first day of spring is always March 20, or the spring equinox. It is also called the vernal equinox.
The first day of spring is called the vernal equinox or the March equinox.
Tuesday, 20 March 2012 is the first day of spring
The date of Easter is determined by the first day of spring. Easter is held on the first Sunday after the first full moon after the first day of spring.
Last day of Spring: 31st of August