Remember when you were young and would play outside in the rain mud, snow, etc... Why and when did this stop??
Don't make the weather an excuse or you'll never have control of your health and fitness goals! Too often I hear the excuse, "well it was raining". You can buy a rain poncho from the dollar store if you don't have a rain jacket if need be.
Get outside, enjoy the fresh air and remember the days when excuses just didn't exist in your behavior!!