Spring in February?

Yesterday I was on the couch trying to sleep off a fever. Foggily, I thought I heard a robin...or maybe a flock of them. Sure enough, this morning there was a little russet-bellied guy preening itself in the tree outside my window (not far from where the cat was crouched the other day). As if that's not enough to tempt spring fever (the fun kind), three-inch daffodil shoots have appeared in my flower bed almost overnight. Furthermore, last night I slept with the window open. No, I don't live in the southern hemisphere.