I'm with @faffi here, 60/65 is a great temp when the sun's out and no wind. I enjoy wearing leathers and light to medium gloves. So that gives me the most protection along with comfort. When it gets hot I may only ride with boots, jeans, t-shirt, and helmet. At that point as long as you're moving temps nearing 100 are still bearable. But I don't have many cities to deal with stop and go traffic. If that were the case I'd lower my top end temp.Personally, I prefer around 65 on a sunny day, and about 70 if overcast. Those temps are OK both riding, as well as stopped for a while without having to remove my gear.