Once, the Earth had no schedule. Snow would fall on blooming roses, and heatwaves would strike in the middle of a frost. To fix the chaos, Father Time called the twelve months together to assign them to the .
: These happen when the sun passes directly over the equator, resulting in nearly equal parts day and night.
| Source | System Used | Hemisphere | Key Month-Season Match | |--------|-------------|------------|------------------------| | NOAA (National Oceanic and Atmospheric Administration) | Meteorological | Northern | Summer = June, July, August | | Royal Meteorological Society (UK) | Meteorological | Northern | Winter = Dec, Jan, Feb | | U.S. Naval Observatory | Astronomical | Both | Equinox/solstice dates verified | | Australian Bureau of Meteorology | Meteorological | Southern | Summer = Dec, Jan, Feb |
Starts December 20–22; ends March 19–21. months for the seasons verified
Verified Month-to-Season Tables (by hemisphere)
Before diving into the specific months for each season, let's quickly review what each season is characterized by:
While the traditional months for each season are based on astronomical definitions, climate seasons can differ significantly depending on the region. In some parts of the world, the climate seasons may begin earlier or later than the astronomical seasons. For example: Once, the Earth had no schedule
Introduction Seasons are recurring intervals defined by Earth's tilt and orbit (astronomical) or by grouping calendar months with similar climate patterns (meteorological). Different communities and disciplines use different definitions. This paper compares the two primary scientific conventions, explains their bases, and offers a verified month-to-season mapping useful for data reporting and public communication.
Because Earth's orbit is an ellipse, not a perfect circle, its speed varies. Earth moves faster when it is closer to the Sun (in January) and slower when it is farther away (in July). This results in astronomical seasons that vary in length from 89 to 93 days. As astronomer Matthew Beaky notes, winter is the shortest season and summer is the longest, "though only by a few days".
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Begins around September 22 (Vernal Equinox) and ends around December 21. Verified Months: September, October, November. Summary Table of Verified Months Season (Northern) Season (Southern) Meteorological Months Astronomical Window Winter Summer December, January, February Dec 21 – Mar 20 Spring Autumn March, April, May Mar 20 – June 20 Summer Winter June, July, August June 20 – Sept 22 Autumn Spring September, October, November Sept 22 – Dec 21 Why Do We Need Verified Definitions?
The system is all about the physics of the solar system. It marks the exact moment the sun crosses the celestial equator or reaches its highest/lowest point in the sky. Why Do Seasons Flip in the South?