I thought I’d planned well for the trip as far as what temperatures we’d experience but I think I payed too much attention to the daytime highs and ignored the overnight lows and the effects of altitude. Night time temperatures can be a little important when your camping in a tent trailer.
At the Loveland Pass (11,000ft) we experienced snow and thankfully were not camping there. But, later in the day beside the Colorado
River near Arches National Park (~6,000ft) the overnight lows were in the 3° range.
Tonight at Bryce National Park the campground office has a sign requesting that you disconnect your waterline as the overnight low is expected to be -3°C.
Right now I’m by the cosy camp fire. Could be some snuggling for warmth later.