Before you get lost in your reverie thinking about our warm winter weather here in Phoenix, please keep in mind that the source of that warmth (persistent high pressure system sitting over us) also causes the crappy, dirty air that obscures the gorgeous mountains of our Valley. Thanks to breathing and rebreathing the exhaust that pours from thousands of cars, my throat is scratchy and my eyes itchy making it necessary to pop decongestant and antihistamine on a regular basis. This is not pleasant.
So, in summary:
warmth in winter = nice; air pollution that comes with it = not nice.