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would say: late March through late June. But this is awkward for calendars. The phenologist would say: it depends on your latitude and the year’s temperature anomaly. But this is too complex for daily life. The meteorologist has won the popular vote. In global weather reporting, climate data analysis, and most everyday conversation in North America and Europe, March, April, and May are now the de facto spring months.
While the Northern Hemisphere is experiencing autumn, the Southern Hemisphere is enjoying warming temperatures and blooming wildflowers, often famously vibrant in places like Namaqualand in South Africa or the Outback in Australia.
Meteorologists use the Gregorian calendar and temperature cycles to group months into seasons. This makes record-keeping much easier. March, April, and May. Start Date: March 1st. End Date: May 31st. Astronomical Spring which are spring months
The confusion often stems from the difference between "Meteorological Spring" and "Astronomical Spring." If you ask a meteorologist, they will give you a fixed date (March 1st or Sept 1st) to make calculating weather statistics easier. If you ask an astronomer—or look at most calendars—they will point to the equinox, which varies slightly each year based on the Earth's orbit.
Phenological spring is collapsing. Due to climate change, the biological calendar is shifting at an average rate of 2.5 to 3 days per decade earlier in temperate zones. In 2023, Washington D.C.’s cherry blossoms reached peak bloom on March 23—a full week earlier than the 1921–2020 average. This means that the months of spring are no longer fixed even by nature . What was April warmth 50 years ago is now March warmth. Phenologically, March has begun to act like April, and April like May. would say: late March through late June
For practical purposes: (Northern Hemisphere) or September, October, November (Southern Hemisphere).
This system is observationally neat but practically useless. The lag between solar radiation and atmospheric warming means that by the astronomical start of spring, much of the Northern Hemisphere is still firmly in winter’s grip. Conversely, by the June solstice, many regions are already experiencing summer heat. Astronomical spring is a geometry lesson, not a weather forecast. But this is too complex for daily life
need consistent, 30-to-31-day blocks to compare weather statistics from year to year.