Seasons shape what we eat, how we work, where we travel, and even how cultures mark the year. But “when” seasons start depends on which definition you use — astronomical, meteorological, or cultural — and on where you are on Earth. This post explains each system, why they differ, and what those differences mean for weather, ecosystems, culture, and everyday life.
The seasons occur at opposite times of the year in the Northern and Southern Hemispheres. When it is summer in the Northern Hemisphere, it is winter in the Southern Hemisphere, and vice versa. This is due to the Earth's axial tilt, which causes the Southern Hemisphere to be tilted away from the Sun during the Northern Hemisphere's summer. when do the four seasons start and end
The Vernal Equinox , which usually falls on March 19, 20, or 21 . Astronomical End: The Summer Solstice (around June 20). Meteorological Dates: March 1 to May 31. Seasons shape what we eat, how we work,
calendar (based on Earth's position relative to the sun) or the meteorological The seasons occur at opposite times of the
These are based on the position of the Earth in its orbit. They begin at the equinoxes (when day and night are nearly equal) and solstices (the longest and shortest days). Because Earth's orbit is elliptical and not exactly 365 days, these dates shift slightly every year.
(the longest and shortest days of the year). Because a full orbit takes approximately 365.24 days, these dates shift slightly each year. in the Northern Hemisphere, the astronomical timeline is: Starts March 20 (Vernal Equinox) and ends June 20. Starts June 21 (Summer Solstice) and ends September 21. Fall (Autumn):
December 21 or 22. This is the shortest day of the year.