I broke my wrist in a similiar accident as yours. I was in a cast for 8 weeks. It was in the summer and hot and humid. I found that putting an ice pack on the cast kept the itching and irritation down. My ortho was very concerned about the bone healing correctly because of the location. He thought improper healing would cause arthritis. Apparently the bone healed correctly because I've had no problems with it.

I lost a lot of strength in my hand due to the way the cast was fitted. When the cast came off my ortho did not prescribe pt but showed me some exercises to help regain my strength. I also worked with an exercise physiologist/rehab person at my gym. As I recall, it took about 4-6 weeks after the cast came off to be able to ride my bike again but by that time bicycling season was over with. By the next summer I didn't even know I had broken a bone.

IMHO, it was the easiest injury to get over. Knee and shoulder injuries are much worse.