The falls around March 20 in the Northern Hemisphere and September 22 in the Southern Hemisphere.
: Based on the annual temperature cycle and the 12-month calendar. Meteorologists divide the year into four 3-month periods to make record-keeping and statistical comparisons easier. months for the seasons verified
| Season | Astronomical (approx. dates) | Meteorological (full months) | |--------|------------------------------|------------------------------| | Spring | September 23 – December 21 | September, October, November | | Summer | December 22 – March 19 | December, January, February | | Autumn | March 20 – June 20 | March, April, May | | Winter | June 21 – September 22 | June, July, August | The falls around March 20 in the Northern
In 2007, the World Meteorological Organization (WMO) officially standardized the meteorological seasons for all climate normals (1991-2020, 2001-2030, etc.). Today, every verified weather report uses March-May (Spring), June-Aug (Summer), Sep-Nov (Fall), Dec-Feb (Winter) . | Season | Astronomical (approx
. This system is "verified" for scientific data collection because it allows for easy year-over-year comparison. Northern Hemisphere: March, April, May (Starts March 1) June, July, August (Starts June 1) September, October, November (Starts September 1) December, January, February (Starts December 1) Southern Hemisphere: March, April, May June, July, August September, October, November December, January, February 2. Astronomical Seasons (Solar-Based)