Using accurate, verified seasonal timelines is crucial for several global industries:
Because the Earth's orbit is elliptical and takes roughly 365.24 days, the exact start dates of astronomical seasons shift slightly by a day or two each year. Astronomical Spring (Vernal Equinox to Summer Solstice) Mid-March, April, May, to Mid-June months for the seasons verified
Defined by dividing the year into four 3-month periods, starting on the first day of the month (Dec 1, Mar 1, Jun 1, Sep 1) 0.5.1. Using accurate, verified seasonal timelines is crucial for
The Verified Guide to the Months for Every Season If you’ve ever wondered exactly when one season ends and the next begins, you aren’t alone. The answer actually depends on who you ask—meteorologists or astronomers. While we all feel the shift in temperature and see the leaves change, the "verified" dates for the seasons follow two distinct calendars. The answer actually depends on who you ask—meteorologists
Perhaps the most compelling reason for the meteorological system is its practical alignment with our experience. "Astronomical winter" begins on the winter solstice (around December 21st), which is often well into the season's coldest weather. Similarly, a December 21st start date for winter means that over three weeks of December (a month we associate with cold) are counted as fall. As NCEI points out, the meteorological seasons, based on the annual temperature cycle, make it "easier to calculate seasonal statistics from the monthly statistics" for agriculture, commerce, and other purposes.
The system is all about consistency. By grouping three whole months together, it makes it much easier for scientists to calculate monthly and seasonal statistics.