It has been spring for about three hours. Do you notice a difference? That is using the occurrence of the vernal equinox to be the beginning of spring (in the northern hemisphere) and autumn in the southern hemisphere. I live in the Central Time Zone of the US and Google told me that the vernal equinox happened at 10:33 my time. I enjoy looking at time.gov and seeing the seconds tick by.
Our calendar is only one of about 60 different calendars in use around the world, according to something I read somewhere sometime. Our mathematical and traditional categories may not exactly fit Earth's movements. It seems that the Earth's movements are slowing slightly but only a few thousands of a second.
Winter can be deadly, challenging, inconvenient, expensive. Once, on April 4, supposedly into spring by that date, we had to pull off the highway at Madison, 100 miles south, to pull wet heavy snow off the windshield. It was too heavy and sticky for the windshield wipers. Late storms in the last of winter and the beginning of spring have sometimes brought that heavy snow to power lines, leaving people without electricity. This winter has been mild-ish and we have had no late snowfalls. We hope it continues.