January weather forecast
Yellowstone National Park, WY

A bone-chilling cold takes over Yellowstone National Park, Wyoming in January. The temperatures tumble to the lowest of the year, with the mercury dipping to a frigid 1.2°F (-17.1°C) and peaking at a chilly 24.4°F (-4.2°C). The near-constant snowfall, with a monthly collection of 34.3" (871mm), creates a winter wonderland. Travellers should equip themselves with warm clothes and necessary gear. The reduced hours of daylight and sunshine add to the arctic ambiance of the place.

Temperature

January's advent presents an average high-temperature of a still subzero cold 24.4°F (-4.2°C), indicating a slight variation from the conditions of the previous month. Marked by a significant drop from the daytime highs, Yellowstone National Park's average low-temperature in January stands at a polar cold 1.2°F (-17.1°C).

Rainfall

In Yellowstone National Park, in January, during 16.8 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. In Yellowstone National Park, during the entire year, the rain falls for 151 days and collects up to 20.91" (531mm) of precipitation.

Snowfall

January through June, September through December are months with snowfall. The month with the most snowfall in Yellowstone National Park is January, when snow falls for 16.2 days and typically aggregates up to 34.29" (871mm) of snow.

Daylight

In January, the average length of the day is 9h and 18min.
On the first day of the month, sunrise is at 7:58 am and sunset at 4:53 pm. On the last day of January, sunrise is at 7:41 am and sunset at 5:29 pm MST.

Sunshine

In Yellowstone National Park, the average sunshine in January is 5h.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum high UV index of 1 in January translates into the following recommendations:
Children must always have sun protection, unlike most people, who can tolerate up to an hour in the sun without any burns. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.