It could be today!
How the first day of spring is defined depends on whether you are referring to the astronomical spring or meteorological spring.
Astronomical spring
Astronomical seasons refer to the
position of the Earth's orbit in relation to the Sun taking in to consideration
the equinoxes and solstices. This is due to the 23.5 degrees of tilt of
the Earth's rotational axis in its orbit around the Sun.
Since the seasons vary in length, the
start date of a new season can fall on different days each year. This year,
astronomical spring begins on 20th March 2021 and ends on 20th June
2021.
Meteorological spring
Meteorological
seasons are instead based on the annual temperature cycle and measure the
meteorological state as well as coinciding with the calendar to determine a
clear transition between the seasons.
The meteorological seasons consist of splitting the seasons into 4 periods made up of 3 months each. These seasons are split to coincide with our Gregorian calendar and make it easier for meteorological observing and forecasting to compare seasonal and monthly statistics. By the meteorological calendar, spring will always start on 1st March and end on 31st May.
The meteorological seasons are defined as spring (March, April and May), summer (June, July and August), autumn (September, October and November) and winter (December, January and February).
Whether you choose 1st March or 20th March to mark the start of spring .... “Do remember they can’t cancel the spring”
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