April weather forecast
Yellowstone National Park, WY

April observes a significant warming trend with the park's fauna coming fully alive after the long and arduous winter. A substantially reduced snowfall of 21.4" (544mm) combined with longer daylight and sunshine hours makes for pleasant day trips. Though rainfall occurrence increases, it's the continued transition from snow that dominates the weather pattern. Adventurous visitors may capture the park's dramatic spring awakening. Expect encounters with roaming elk, bison, and other wildlife species.

Temperature

As Yellowstone National Park welcomes April, the average high-temperature displays a subtle shift, adjusting from a cold 36.1°F (2.3°C) in March to a chilly 43.3°F (6.3°C). In April, Yellowstone National Park endures a notable temperature shift from day to night, with lows averaging at a freezing cold 18°F (-7.8°C).

Rainfall

In April, the rain falls for 11.6 days. Throughout April, 1.77" (45mm) of precipitation is 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

Months with snowfall are January through June, September through December. In Yellowstone National Park, during April, snow falls for 9.5 days and regularly aggregates up to 21.42" (544mm) of snow. In Yellowstone National Park, during the entire year, snow falls for 91.4 days and aggregates up to 193.7" (4920mm) of snow.

Daylight

In Yellowstone National Park, the average length of the day in April is 13h and 30min.
On the first day of April, sunrise is at 7:01 am and sunset at 7:50 pm. On the last day of the month, sunrise is at 6:12 am and sunset at 8:25 pm MDT.

Sunshine

The average sunshine in April is 8h.

UV index

The average daily maximum UV index in April is 6. A UV Index of 6 to 7 symbolizes a high threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: The maximum UV index of 6 during April leads to these instructions:
Resist overexposure. Safeguarding from solar damage is indispensable. Attempt to stay under shade and limit exposure to the Sun between 10 a.m. and 4 p.m., when UV radiation is at its peak. Remember, devices such as parasols or canopies might not provide complete sun protection. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.