Nostalgic

I have been trying to figure out why I've been so nostalgic over the change of seasons from summer to fall.  Why is it that the colors of leaves seem more vivid this year; why it feels great to pull out a sweater to keep warm from the autumn breeze?  I have finally figured it out - I missed fall completely last year!  My perpetual summer changed into winter and snow overnight, and I missed out on the leaves and fall sweaters.