First of all, congrats on your weight loss... that's an awesome achievement!
Secondly, have you considered trying some inside workout routines? If you like to walk, take a trip to your local library and see if they have any workout routines on tape, like, Walk Away the Pounds, or things like that.
If you have space, then, maybe doing a warm up inside... like doing things like jumping jacks, squats, running in place... then taking a shorter walk outside would be okay, too. Have you considered getting a jump rope? If you do a nice warm up inside, then just go right outside in the front and do some jump roping, when you're done you can do a little cool down stretching and then be back inside so you don't freeze your toosh off.
Good luck, hun.