Everywhere I have lived before, with the exception of Vegas, has had the same answer. More in fall, less in winter, more in summer. Why no spring? It doesn't really exist in most of those places.
Now however, I live in India and the answer is...I rarely smoke anymore. It's just too blasted hot. When it gets down to 72° F it's monsoon. The rest of the year it rarely drops below 80° F and the humidity sucks for pipe smoking.
Maybe I'll change my mind someday if I can get used to the heat but the only times I'll get to smoke is when I go back home for the summers or go one holiday in a less toasty climate.