Most people don't have the chance to work outside, and of course the rain and the wind and the cold can get you down, but the benefits far outweigh the drawbacks. You dont get views like this one that we tweeted today for a start.
Not to mention that you are exercising all day long, breathing nothing but the freshest air, and being exposed to plenty of sunlight. Every day is a good day if you look on the bright side. Except snowy ones. I hate the snow.