WHAT SIGNALS SPRING?

In the Pink!

In California we certainly do not have the groundhog (not that he is really so reliable anyway) so what does signal Spring to us?
Is it the sparkle like diamonds on the ocean's blue-green waters? Is it the brisk breeze on a clear sunny day? Is it the call of baby crows in the trees? The chirping of myriad birds everywhere? Or is it the blossoming buds on ornamental fruit trees? The sound of laughter in the streets?
For me, probably all of the above are signals. What about you--what signals Spring to you?