OK, so 60 degrees isn't very cold... especially when you're on top of a big warm horse and working hard.
Buck and I went on our first cold weather ride today, and it was wonderful. He was feeling frisky, and I was feeling motivated to get us both warmed up, and he gave me his fastest gallop yet! My lazy horse was eager to run. I actually had to correct him several times when he would try to trot/gallop without being queued for it. This is the horse who would be perfectly happy plodding around in a circle at a children's pony ride. If this is what winter is going to be like, I can't wait!