NASA Antero Reservoir as seen from space and photographed during STS-58 in October of 1993. The reservoir appears as a dark blotch near the lower left of the photograph. Colorado has registered the coldest temperature in the lower 48 states so far this winter season. Antero Reservoir in Park County reached negative 50 degrees Fahrenheit Wednesday morning, which is the fourth coldest reading observed there since records started in 1961. Just got off the phone with our Antero Reservoir CO-OP weather observer. It hit -50F this morning! Don't worry, it's already warmed up to -40F as of 7:51 am. #COwx— NWS Boulder (@NWSBoulder) December 30, 2020