Precipitation: Yellowstone National Park receives an average of 20 inches (51 cm) of precipitation per year, most of which falls as snow. The wettest month is May, when the park receives an average of 3.5 inches (9 cm) of precipitation.
Sunlight: Yellowstone National Park is located at a latitude of 44°N, meaning that the length of daylight varies significantly throughout the year. In December, the shortest day of the year, there are only about 8 hours of daylight, while in June, the longest day of the year, there are about 16 hours of daylight.