While on a bike tour that took us through Lassen National Park a few weeks ago, my wife and I experienced 35 F temperatures and 35 mph winds. We were camping in the park, and our lightweight sleeping bags were not adequate. We also had 3600 feet of climbing that topped out at over 8000 feet. We figured it would not be a fun day. We decided that was too cold, and dropped down 6000 feet to the Central Valley where it was a balmy 91 F