For residents of New York, December brings snow and freezing temperatures. For residents of Sydney, December brings beach weather and high UV indexes. This stark contrast is not an anomaly but a fundamental consequence of Earth’s geometry. The concept of "seasons by hemisphere" is often misunderstood as being merely inverted; in reality, the two hemispheres experience different intensities and rhythms of seasons. This paper argues that while the calendar dates of seasons are opposite, the Southern Hemisphere’s seasons are generally milder, windier, and less extreme than those of the Northern Hemisphere.
The equinoxes occur when the sun is directly above the equator, making day and night roughly equal in length all over the world. seasons by hemisphere