Sources for verification: NOAA (National Centers for Environmental Information), World Meteorological Organization (WMO), NASA’s Astronomical Almanac, and the US Naval Observatory.
In the Southern Hemisphere, these months are shifted by six months. For example, meteorological summer in Australia is December, January, and February. months for the seasons verified
, which fall around the 21st of their respective months [25]. Spring Equinox: Around March 20 [20, 25] Summer Solstice: Around June 21 [25] Autumn Equinox: Around September 22 [25] Winter Solstice: Around December 21 [25] Regional Variations World Meteorological Organization (WMO)
The Architecture of the Year: A Verification of the Months and Their Seasons NASA’s Astronomical Almanac