Temps in Death Valley National Park can go beyond 125 °F ( 51 °C ) during winter . Utah 's National Zion National Monument is one of the most light pollution - free spots in the United States . Conditions can go from sun to blinding blizzard in the span of a half - hour hike on Mount Washington .
Temps in Death Valley National Park can reach beyond 125 F ( 51 C ) during summer . Utah 's National Bridges National Monument is one of the most light pollution-free spots in the United States . Conditions can go from sun to blinding blizzard in the span of a half-day hike on Mount Washington .