May weather forecast
West Yellowstone, MT

Weather in May

May, the last month of the spring in West Yellowstone, is a chilly month, with an average temperature fluctuating between 28.9°F (-1.7°C) and 49.8°F (9.9°C).

Temperature

In May, the average high-temperature rises from a wintry 37.2°F (2.9°C) in April to a chilly 49.8°F (9.9°C). In May, in West Yellowstone, the average low-temperature is 28.9°F (-1.7°C).

Humidity

In West Yellowstone, Montana, the average relative humidity in May is 76%.

Rainfall

May is the month with the most rainfall. Rain falls for 17.4 days and accumulates 2.8" (71mm) of precipitation.

Snowfall

Months with snowfall are January through July, September through December. In West Yellowstone, in May, snow falls for 10.3 days, with typically accumulated 8.23" (209mm) of snow. Throughout the year, in West Yellowstone, there are 159.3 snowfall days, and 120.47" (3060mm) of snow is accumulated.

Daylight

In West Yellowstone, the average length of the day in May is 14h and 50min.
On the first day of May in West Yellowstone, sunrise is at 6:13 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 9:01 pm MDT.

Sunshine

In May, the average sunshine is 9.6h.

UV index

The average daily maximum UV index in May is 3. A UV Index value of 3 to 5 symbolizes a moderate threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 3 in May interpret into the following advice:
Take precautions - Protection against skin and eye damage is obliged. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in May in West Yellowstone?

The average high-temperature, in May, is 49.8°F (9.9°C), while the average low-temperature is 28.9°F (-1.7°C).

What is the average humidity in May in West Yellowstone?

In May, the average relative humidity is 76%.

What is the rainiest month in West Yellowstone?

The month with the most rainfall in West Yellowstone is May, when the rain falls for 17.4 days and typically aggregates up to 2.8" (71mm) of precipitation.

How much does it rain in West Yellowstone in May?

In May, in West Yellowstone, the rain falls for 17.4 days. Throughout May, 2.8" (71mm) of precipitation is accumulated.

How much does it snow in West Yellowstone in May?

In West Yellowstone, Montana, in May, snow falls for 10.3 days, with typically accumulated 8.23" (209mm) of snow.

How many hours of daylight does West Yellowstone have in May?

In May, the average day length is 14h and 50min.

When is the sunrise / sunset in May in West Yellowstone?

On the first day of May in West Yellowstone, sunrise is at 6:13 am and sunset at 8:29 pm. On the last day of the month, sunrise is at 5:42 am and sunset at 9:01 pm MDT.

How many hours of sunshine does West Yellowstone have in May?

In West Yellowstone, the average sunshine duration in May is 9.6h.

How high is the UV index in May in West Yellowstone?

The average daily maximum UV index in May is 3. A UV Index estimate of 3 to 5 represents a medium hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
West Yellowstone, MT

Average temperature in May - West Yellowstone, MT
  • Average high temperature in May: 49.8°F

The warmest month (with the highest average high temperature) is July (72.9°F).
The month with the lowest average high temperature is December (20.1°F).

  • Average low temperature in May: 28.9°F

The month with the highest average low temperature is August (43.7°F).
The coldest month (with the lowest average low temperature) is December (4.8°F).

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Average pressure in May
West Yellowstone, MT

Average pressure in May - West Yellowstone, MT
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.24"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in May
West Yellowstone, MT

Average wind speed in May - West Yellowstone, MT
  • Average wind speed in May: 6mph

The windiest month (with the highest average wind speed) is June (6.8mph).
The calmest month (with the lowest average wind speed) is August (5.8mph).

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Average humidity in May
West Yellowstone, MT

Average humidity in May - West Yellowstone, MT
  • Average humidity in May: 76%

The month with the highest relative humidity is February (95%).
The month with the lowest relative humidity is August (50%).

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Average rainfall in May
West Yellowstone, MT

Average rainfall in May - West Yellowstone, MT
  • Average rainfall in May: 2.8"

The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is July (0.91").

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Average rainfall days in May
West Yellowstone, MT

Average rainfall days in May - West Yellowstone, MT
  • Average rainfall days in May: 17.4 days

The month with the highest number of rainy days is May (17.4 days).
The month with the least rainy days is January (2.2 days).

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Average snowfall in May
West Yellowstone, MT

Average snowfall in May - West Yellowstone, MT
  • Average snowfall in May: 8.23"

The month with the highest snowfall is February (17.83").
The month with the least snowfall is August (0").

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Average snowfall days in May
West Yellowstone, MT

Average snowfall days in May - West Yellowstone, MT
  • Average snowfall days in May: 10.3 days

The month with the highest number of snowfall days is March (24.4 days).
The months with the least snowfall days are July and August (0.2 days).

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Average daylight in May /
Average sunshine in May
West Yellowstone, MT

Average daylight in May / Average sunshine in May - West Yellowstone, MT
  • Average daylight in May: 14h and 50min

The month with the longest days is June (Average daylight: 15h and 31min).
The month with the shortest days is December (Average daylight: 8h and 53min).

  • Average sunshine in May: 9h and 36min

The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are January, February and December (Average sunshine: 3h and 18min).

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Average sunshine days in May
West Yellowstone, MT

Average sunshine days in May - West Yellowstone, MT
  • Average sunshine days in May: 5.5 days

The months with the most sunshine days are July and September (14.7 days).
The month with the least sunshine days is February (5.3 days).

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Average UV index in May
West Yellowstone, MT

Average UV index in May - West Yellowstone, MT
  • Average UV index in May: 3

The month with the highest UV index is July (UV index 5).
The months with the lowest UV index are January, February, March, April, October, November and December (UV index 1).

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Average cloud cover in May
West Yellowstone, MT

Average cloud cover in May - West Yellowstone, MT
  • Average cloud cover in May: 39

The month with the most cloud cover is February (Cloud cover 76).
The month with the least cloud cover is July (Cloud cover 16).

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Average visibility in May
West Yellowstone, MT

Average visibility in May - West Yellowstone, MT
  • Average visibility in May: 5mi

The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February, March and December (3mi).

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