Technically-speaking it is officially spring here in the
northern hemisphere if you are speaking meteorologically.
According to the meteorological definition,
the seasons begin on the first day of the months that include the equinoxes and
solstices: Thusly, spring runs from
March 1 to May 31; summer runs from June 1 to August 31; fall (autumn) runs
from September 1 to November 30; and winter runs from December 1 to February 28
(February 29 in a leap year).
The
astronomical definition uses the dates of equinoxes and solstices to mark the
beginning and end of the seasons: Spring
begins on the spring equinox; summer begins on the summer solstice; fall
(autumn) begins on the fall equinox; and winter begins on the winter solstice. The beginning of
each season marks the end of the last.
Because
the timings of the equinoxes and solstices change each year, the length of
astronomical seasons within a year and between years also varies.
If you want to keep it simple - the arrival of the male redwing
blackbirds to stake out their breeding territories is a harbinger of spring and marks the official start.
It is also the beginning of mud season.
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