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 |