Thursday, November 27, 2025

Seasons

 Copilot:

Meteorological winter is said to begin on December 1. Can you give the start dates for all fourseasons in this system?

In the meteorological system, the seasons begin on fixed dates:

Spring: March 1

Summer: June 1

Fall (Autumn): September 1

Winter: December 1


🌍 Why Meteorological Seasons Use These Dates

Meteorological seasons are based on the annual temperature cycle rather than the Earth’s position relative to the Sun. Each season is defined as a three-month block that aligns neatly with the calendar year:

Spring: March, April, May

Summer: June, July, August

Fall: September, October, November

Winter: December, January, February


This system is widely used by meteorologists and climatologists because:

It makes climate statistics easier to compare year-to-year (e.g., average winter temperatures).

It avoids the shifting dates of astronomical seasons, which depend on equinoxes and solstices that vary slightly each year.

It provides a consistent framework for weather forecasting and record keeping.


🔭 Contrast with Astronomical Seasons

Astronomical seasons are tied to Earth’s orbit and the Sun’s position:

Spring: Begins at the vernal equinox (~March 20–21)

Summer: Begins at the summer solstice (~June 20–21)

Fall: Begins at the autumnal equinox (~September 22–23)

Winter: Begins at the winter solstice (~December 21–22)


Because equinoxes and solstices shift slightly each year, astronomical start dates are less tidy for statistical use.

                                                                             



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How to Surf (with Pictures) - wikiHow


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