May. Hands down. And the whole spring period from April-early June.
I love green and seeing all my favorite flowers--tulips, dogwoods, azaleas, magnolia trees, crocus, hyacinth. I love the warm, moist air, hearing the birds chirp, smelling the first mown grass, seeing the trees with their new green leaves. All I want to do is be outside on a nice spring day. Aaaahhhh....wish we could go just skip winter and go straight back to spring.