May weather forecast
Big Sky, MT

Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana
Vast fields and planted forests near the scenic mountainous region in Big Sky, Montana

Weather in May

May, the last month of the spring in Big Sky, is a cool month, with temperature in the range of an average low of 30.6°F (-0.8°C) and an average high of 52°F (11.1°C).

Temperature

In Big Sky, the average high-temperature in May increases from a cold 40.1°F (4.5°C) in April to a fresh 52°F (11.1°C). In May, the average low-temperature is 30.6°F (-0.8°C).

Humidity

In May, the average relative humidity is 74%.

Rainfall

The months with the most rainfall are April and May, with an average 2.91" (74mm) of precipitation.

Snowfall

January through December are months with snowfall in Big Sky. In Big Sky, during May, snow falls for 13.5 days and regularly aggregates up to 10.16" (258mm) of snow. In Big Sky, during the entire year, snow falls for 151.6 days and aggregates up to 124.06" (3151mm) of snow.

Daylight

The average length of the day in May in Big Sky is 14h and 54min.
On the first day of May in Big Sky, sunrise is at 6:13 am and sunset at 8:31 pm. On the last day of the month, sunrise is at 5:41 am and sunset at 9:04 pm MDT.

Sunshine

In Big Sky, the average sunshine in May is 9.5h.

UV index

In May, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for average individuals.
Note: In May, the average maximum UV index of 3 translate into the following recommendations:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in May in Big Sky?

The average high-temperature, in May, in Big Sky, is 52°F (11.1°C), while the average low-temperature is 30.6°F (-0.8°C).

What is the average humidity in May in Big Sky?

In May, the average relative humidity in Big Sky, Montana, is 74%.

What is the wettest month in Big Sky?

The wettest months in Big Sky are April and May, with an average 2.91" (74mm) of rainfall.

How many days does it rain in May in Big Sky?

In Big Sky, Montana, in May, it is raining for 16.3 days, with typically 2.91" (74mm) of accumulated precipitation.

How much does it snow in Big Sky in May?

In Big Sky, Montana, in May, during 13.5 snowfall days, 10.16" (258mm) of snow is typically accumulated.

What is the average length of the day in May in Big Sky?

In May, the average day length in Big Sky, Montana, is 14h and 54min.

When is the sunrise / sunset in May in Big Sky?

In May, on the first day of the month, sunrise is at 6:13 am and sunset at 8:31 pm. On the last day of the month, in Big Sky, Montana, sunrise is at 5:41 am and sunset at 9:04 pm MDT.

How many hours of sunshine does Big Sky have in May?

In Big Sky, Montana, the average sunshine duration in May is 9.5h.

What is the UV index reading in May in Big Sky?

The average daily maximum UV index in May in Big Sky is 3. A UV Index of 3 to 5 symbolizes a moderate vulnerability 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
Big Sky, MT

Average temperature in May - Big Sky, MT
  • Average high temperature in May: 52°F

The warmest month (with the highest average high temperature) is July (74.8°F).
The month with the lowest average high temperature is December (22.5°F).

  • Average low temperature in May: 30.6°F

The month with the highest average low temperature is August (45.1°F).
The coldest month (with the lowest average low temperature) is December (7.9°F).

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Average pressure in May
Big Sky, MT

Average pressure in May - Big Sky, MT
  • Average pressure in May: 29.94"Hg

The month with the highest atmospheric pressure is January (30.22"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in May
Big Sky, MT

Average wind speed in May - Big Sky, MT
  • Average wind speed in May: 5mph

The windiest month (with the highest average wind speed) is January (7.1mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).

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Average humidity in May
Big Sky, MT

Average humidity in May - Big Sky, MT
  • Average humidity in May: 74%

The months with the highest relative humidity are January and February (90%).
The month with the lowest relative humidity is August (51%).

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Average rainfall in May
Big Sky, MT

Average rainfall in May - Big Sky, MT
  • Average rainfall in May: 2.91"

The wettest months (with the highest rainfall) are April and May (2.91").
The driest month (with the least rainfall) is July (1.18").

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Average rainfall days in May
Big Sky, MT

Average rainfall days in May - Big Sky, MT
  • Average rainfall days in May: 16.3 days

The month with the highest number of rainy days is June (16.6 days).
The month with the least rainy days is February (4.3 days).

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Average snowfall in May
Big Sky, MT

Average snowfall in May - Big Sky, MT
  • Average snowfall in May: 10.16"

The month with the highest snowfall is April (19.88").
The month with the least snowfall is August (0.08").

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Average snowfall days in May
Big Sky, MT

Average snowfall days in May - Big Sky, MT
  • Average snowfall days in May: 13.5 days

The month with the highest number of snowfall days is March (21 days).
The month with the least snowfall days is August (0.3 days).

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Average daylight in May /
Average sunshine in May
Big Sky, MT

Average daylight in May / Average sunshine in May - Big Sky, MT
  • Average daylight in May: 14h and 54min

The month with the longest days is June (Average daylight: 15h and 35min).
The month with the shortest days is December (Average daylight: 8h and 49min).

  • Average sunshine in May: 9h and 30min

The month with the most sunshine is July (Average sunshine: 11h and 42min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

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Average sunshine days in May
Big Sky, MT

Average sunshine days in May - Big Sky, MT
  • Average sunshine days in May: 5.7 days

The month with the most sunshine days is September (14.5 days).
The month with the least sunshine days is May (5.7 days).

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Average UV index in May
Big Sky, MT

Average UV index in May - Big Sky, 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 and February (UV index 1).

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Average cloud cover in May
Big Sky, MT

Average cloud cover in May - Big Sky, MT
  • Average cloud cover in May: 40

The month with the most cloud cover is February (Cloud cover 60).
The month with the least cloud cover is July (Cloud cover 17).

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Average visibility in May
Big Sky, MT

Average visibility in May - Big Sky, MT
  • Average visibility in May: 5mi

The months with the highest visibility are June, July, August, September and October (6mi).
The months with the lowest visibility are January, February, March, April and December (4mi).

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