I too prefer to not tour in the dead of winter where really cold weather is the norm, but brief spells of sub freezing temperatures are a possibility in Spring, Fall, and even in Summer many places. I have had overnight lows below freezing when at altitude even in the lower 48 in Summer, so I always have clothing that will get me through that kind of weather if I layer it all up. For me that means a windbreaker and a warm shirt along with tights and maybe shell wind pants over my warm weather riding clothes. Add a thin but warm cap and sometimes a down sweater (I added the down sweater recently, but got along fine without it in the past) and I am good to go. It really doesn't take much. I have been comfy enough with a packed clothing weight of 2.5 pounds when it got down into the teens overnight. I did hang around a fire in the morning until the sun was fully up when it was in the mid teens, but rode on while it was still pretty cold.