December is a cold winter month with moderate snowfall as average high temperatures are in the 25°F (-3.9°C) to 45°F (7.2°C) range and the average low temperatures are in the freezing 5°F (-15°C) to 19°F (-7.2°C) range across the state. The majority of the state sees 5" (127mm) to 10" (254mm) of snow, while Lead in the Black Hills accumulates 27" (686mm). December is mostly dry, with an average of 14 sunny days. December is the snowiest month, which mandates protection in the form of warm winter clothes as the strong gusts of wind make the temperatures feel colder than the actual mercury readings. Tourist numbers drop significantly, and those who remain behind are enthusiasts of skiing, snowmobiling, snowshoeing, and other winter activities. Winter sees only 5% of visitors of the summer to Mount Rushmore - the region is temperate than the rest of South Dakota, and the freeway from Keystone to the Memorial is regularly maintained to keep it free from snow as far as possible.