Happy first day of spring! Sort of...

Thursday marks the first day of 'meteorological spring'

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SAN ANTONIO – Happy first day of spring! Sort of...

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Thursday marks the meteorological start of spring.  

While most people still go off of the astronomical seasons, many in the world of meteorology use a slightly different calendar.

Here’s why…

KSAT Weather: Beautiful weather for the end of the week

The astronomical seasons, which have been used for thousands of years, are based on the natural rotation of the earth around the sun: You have two equinoxes and two solstices.  

For the astronomical calendar, the spring equinox is March 20. Thanks to things like leap years and the elliptical shape of the earth’s orbit, the lengths of the astronomical seasons vary between 80 and 93 days. This variation makes it tough to compile and compare climatological statistics.

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