I use to jog 4 miles a day to stay in shape so I can give you some tips but they are not related to the weather. :biggrin:
1) Stick to the indoor track. They are made especially for joggers to protect your feet. I am assuming that you might be overweight since you mentioned that you are coming from a couch and going to a 5k program? Being overweight and jogging on pavement can really hurt your feet and knees to the point that you just can't walk comfortably anymore. Even if you're not overweight, you can still hurt your knees so I really wouldn't recommend it. If you still want to go outside then try and find gravel, dirt, sand, or soft grass like a golf course. Neighborhood grass does not work so well and your neighbors would probably get mad.
lastly, I feel like a broken record since I already mentioned this in another post. :|