Classification

Season

Period

Number of data

WTR

winter

from the winter solstice to the day before the spring equinox

from 12/22 to 3/20

84

SPR

spring

from the spring equinox to the day before the summer solstice

from 3/21 to 6/20

108

SMR

summer

from the summer solstice to the day before the autumn equinox

from 6/21 to 9/22

144

AUT

autumn

from the autumn equinox to the day before the winter solstice

from 9/23 to 12/21

132