Opposite weather here, but motivation in the summer sort of compares. (... though not really. I'm Northeasterner by birth, and cold is way more de-motivating than hot.)

Anyway, in the summer, when it is above 105F almost everyday, I take a certain stoic pleasure in knowing that isn't as bad as everyone thinks it is, and in accepting the elements and adapting to them. If I dwell on how much I hate it, that makes it infinitely harder.