Open, 6º at 7 am 1.5 inches of snow yesterday. Sun and clouds today, high around 19º. We have 25 km classic and 6 km skate. The skiing is perfect and that pretty much says it all.
Carry a knapsack. If you overdress you can carry your extra clothes.
When Nordic skiing we all warm up quite a bit. So that makes it a great sport for cold weather (No chairlift). Sweating does happen. A dry shirt to wear for your second lap and/or to wear home is really nice.