Begins around December 21 or 22 . This is the shortest day of the year. Why the Difference?
Whether you're planning a trip to [21] or simply curious about why your calendar says spring while it's still snowing, understanding how we define seasons is key. There are actually two "official" ways to group months into seasons: meteorological astronomical 1. The Meteorological Seasons (Weather-Based)
Months for the Seasons Verified: The Complete Astronomical and Meteorological Guide months for the seasons verified
Verification: Partially True. At the exact moment of the equinox, the terminator line (the boundary between day and night) passes through the poles, creating nearly equal day and night. However, due to atmospheric refraction (the bending of light by the atmosphere) and the definition of "sunrise" vs. "sunset," most locations will experience slightly more than 12 hours of daylight on the equinox date.
The concept of dividing the year into four distinct seasons—spring, summer, fall (autumn), and winter—is universally recognized. However, the specific start and end dates for these seasons are not universally agreed upon. There are two primary methods for defining them: the astronomical method and the meteorological method. Begins around December 21 or 22
Before diving into the specific months for each season, let's quickly review what each season is characterized by:
Before listing the months, it is crucial to understand the fundamental difference between these two systems. Whether you're planning a trip to [21] or
In the Northern Hemisphere, meteorological seasons are grouped by the calendar months that share the most similar climate traits: March, April, May Summer: June, July, August Autumn (Fall): September, October, November Winter: December, January, February Southern Hemisphere
Consider mid-March. Under the meteorological system, March 1 is the first day of spring. But under the astronomical system, March 1 is still winter (winter lasts until the equinox around March 20).
Officially, there are two ways to define the seasons: the definition, which is based on the Earth’s precise position relative to the sun, and the meteorological definition, which is based on the annual temperature cycle and is used for climate tracking. According to NASA, NOAA, and the UK's National Physical Laboratory (NPL), both definitions are correct, but they serve different purposes and are determined by distinct methods.