Climate and Weather for Yellowstone National Park
The two main characteristics of the weather in Yellowstone National Park are low temperatures and heavy snowfall. The nearest reporting location is in West Yellowstone, which is typically the coldest place in the nation for several days each month of the year—at night, it typically records 35°F in July and -40°F in February. -The lowest time recorded for this location was -66°F in 1933. West Yellowstone’s elevation is 6,659 feet, so the park’s sites — between 7,000 and 8,000 feet for the top visitor spots — are always a few degrees cooler.
Even the daytime temperatures in winters drop below freezing from November to February. However, the place warms slowly in the spring. It can be described as warm from June to September when the snow melts on all but the highest peaks. The park can be pleasantly sunny for weeks, with near-zero humidity and average afternoon highs in the 60s to 70s. The highest temperature recorded in West Yellowstone was 97°F in 1936 and 92°F in Yellowstone Lake in 2003. But as always, circumstances can change. Sudden storms can occur at any period of the year, and long periods of calm can occur even in midsummer.
Every month sees heavy rainfall, spread relatively evenly throughout the year except July, which is the driest month. Annual totals are 150 inches in most areas, but more than half as much snow falls in the high mountains, up to 400 inches, which causes all significant roads through the park to be closed from early November until April/May. However, vehicular traffic is still possible by snowmobile.
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