The weather guys are doing their best to scare us now, promising a big snowstorm for the next couple of days. We'll see. I do love a blizzardy view out my window, however, and look forward to that. Winter weather has played a part in a few of my books (all of which are set in Minnesota or Wisconsin, for the most part), but as I do a mental scan of the ones set during summer, I can't think of how weather played a role in those stories. Frigid air and paralyzing snow tend to provide a useful setting for the dramas involving my often emotionally numbed protagonists. Perhaps if I wrote more often about bawdy adolescents I would be more inclined to conjure up some summer heat.
Off the top of my head: The Long Winter (Laura Ingalls Wilder) has to be the best weather story ever. Other suggestions?