As has been said earlier in this thread, everyone is different. I wear shorts from 55 F and up, and knee warmers under 50 F. 50 - 55 F is kind of a "tweener", and it depends on the day. Sometimes on those days I will start out wearing the knee warmers, and taking them off at the first opportunity, and sometimes I just roll them up and keep them in the middle jersey pocket. Since the knee warmers can go to mid-calf (about the same length as knickers), I dont have tights. My legs generally are warm enough with knee warmers.