Sometimes you know it's spring regardless of the date. I always announce spring with daffodils on St David's Day (1st March). Some people say 21st March (the equinox) is the first day of spring, but that means spring goes on until 21st June, and that's summer in my book.
Anyway, I knew it was spring today as it was warm enough to ditch my boots for the first time this winter (ankle, not wellington!) and wear flatties with no socks. The days are getting longer, welcome Spring 2009 - later than sometimes but all the more welcome for that.
I really wish for long blue sky days this year - not too bothered about heat, but I do like clear skies - they make me happy !