Climate Central: Today, March 20th, marks the first day of the vernal equinox, although spring might feel like it's never going to arrive for those still battling unseasonably cold weather from the Midwest to the East. But don't be fooled by this year's cooler temperatures. When you define the onset of spring as the "first leaf' date for a number of plants, the season is arriving earlier, on average, than it did 30 years ago.
As a whole, the continental U.S. is seeing spring arrive three days sooner when you compare...