Astronomically, the first day of spring occurs on the vernal equinox, March 20th 2022.
By the meteorological calendar spring months are March, April and May. As meteorologists divide the seasons into periods of three entire months, based on average temperatures. Winter being the coldest three months, summer the hottest. So while winter in the northern hemisphere is December, January and February. In the southern hemisphere winter is June, July and August.
Astronomical spring (equinoxes and solstices)
The equinoxes are when the length of the day and night is the same. Mid way between equinoxes are the solstices. This is when the sun is at its highest and lowest at midday. Equinoxes and solstices all occur at times when the seasons begin to change and have thus been used to determine the changing of the seasons.
Spring – March 20th
Summer – June 21st
Autumn – September 23rd
Winter – December 22nd
Seasons in reality
In reality, there is no one way to determine the start of each season. Some people prefer using equinoxes and solstices because they are at predefined dates and signal a change in daylight hours. Although others prefer to keep it simple by using calendar months for each season – March, April and May.
Many deem the first day of spring to be on the date of which the first daffodil flowers bloom and the early birds make their nests. But this is a far more difficult way to determine spring due to the unpredictability of nature. Short periods of warm weather in winter could cause daffodils to come up early, only to be damaged by forthcoming winter weather.