A while ago I've declared to myself, that weather is no excuse! When we were having heavy rain here in Sydney a couple of months ago, I whacked on a rain jacket and went running when it was pouring down! When you look out the window at less-than-desireable weather, it becomes an excuse.
Just think to yourself "I'm crazy, I'm determined, I'm going to feel great after this"
Anyway, enough motivational ramblings!