May weather forecast
Billings, MT

The forest of trees in the plains, on the sandstone bluffs in Billings, Montana
The forest of trees in the plains, on the sandstone bluffs in Billings, Montana

Weather in May

May, the last month of the spring, in Billings, is a comfortable month, with average temperature fluctuating between 64°F (17.8°C) and 44.2°F (6.8°C).

Temperature

In May, the average high-temperature increases, from a cool 53.6°F (12°C) in April, to an enjoyable 64°F (17.8°C). The average low-temperature, in Billings, is 44.2°F (6.8°C).

Humidity

In May, the average relative humidity in Billings is 59%.

Rainfall

May is the month with the most rainfall in Billings. Rain falls for 17.6 days and accumulates 2.13" (54mm) of precipitation.

Snowfall

January through May, September through December are months with snowfall in Billings. May is the last month it regularly snows. During 0.7 snowfall days, Billings aggregates 0.28" (7mm) of snow. In Billings, during the entire year, snow falls for 64.5 days, and aggregates up to 31.18" (792mm) of snow.

Daylight

The average length of the day is 15h.

Sunshine

The average sunshine in Billings is 9.9h.

UV index

The average daily maximum UV index in May is 5. A UV Index estimate of 3 to 5 represents a moderate threat to health from unprotected exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 5 in May interpret into the following advice:
Take precautions - Protection against sunburn is recommended. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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 average humidity in May in Billings?

In May, the average relative humidity in Billings is 59%.

What is the wettest month in Billings?

The month with the most rainfall is May when the rain falls for 17.6 days and typically aggregates up to 2.13" (54mm) of precipitation.

How much does it rain in Billings in May?

In Billings, during May, the rain falls for 17.6 days and regularly aggregates up to 2.13" (54mm) of precipitation.

What is the last month it snows in Billings?

May is the last month it regularly snows in Billings, Montana. During 0.7 snowfall days, in May, Billings aggregates 0.28" (7mm) of snow.

What is the average length of the day in May in Billings?

The average length of the day in May is 15h.

How many hours of sunshine does Billings have in May?

In Billings, Montana, the average sunshine in May is 9.9h.

How high is the UV index in May in Billings?

In Billings, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium health risk from unsafe exposure to the Sun's UV rays.

Average temperature in May
Billings, MT

Average temperature in May - Billings, MT
  • Average high temperature in May: 17.8°C

The warmest month (with the highest average high temperature) is July (29.6°C).
The month with the lowest average high temperature is December (-0.5°C).

  • Average low temperature in May: 6.8°C

The month with the highest average low temperature is July (15.8°C).
The coldest month (with the lowest average low temperature) is February (-7.6°C).

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Average pressure in May
Billings, MT

Average pressure in May - Billings, MT
  • Average pressure in May: 1013.3mbar

The month with the highest atmospheric pressure is January (1020.5mbar).
The month with the lowest atmospheric pressure is June (1011.3mbar).

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Average wind speed in May
Billings, MT

Average wind speed in May - Billings, MT
  • Average wind speed in May: 13.9km/h

The windiest month (with the highest average wind speed) is January (15.9km/h).
The calmest month (with the lowest average wind speed) is July (11.5km/h).

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Average humidity in May
Billings, MT

Average humidity in May - Billings, MT
  • Average humidity in May: 59%

The month with the highest relative humidity is January (76%).
The month with the lowest relative humidity is August (40%).

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Average rainfall in May
Billings, MT

Average rainfall in May - Billings, MT
  • Average rainfall in May: 54mm

The wettest month (with the highest rainfall) is May (54mm).
The driest month (with the least rainfall) is July (18mm).

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Average rainfall days in May
Billings, MT

Average rainfall days in May - Billings, MT
  • Average rainfall days in May: 17.6 days

The month with the highest number of rainy days is May (17.6 days).
The month with the least rainy days is January (6.3 days).

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Average snowfall in May
Billings, MT

Average snowfall in May - Billings, MT
  • Average snowfall in May: 7mm

The month with the highest snowfall is February (165mm).
Months with the least snowfall are June, July and August (0mm).

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Average snowfall days in May
Billings, MT

Average snowfall days in May - Billings, MT
  • Average snowfall days in May: 0.7 days

The month with the highest number of snowfall days is February (13.3 days).
Months with the least snowfall days are June, July and August (0 days).

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Average daylight in May /
Average sunshine in May
Billings, MT

Average daylight in May / Average sunshine in May - Billings, MT
  • Average daylight in May: 15h

The month with the longest days is June (Average daylight: 15.7h).
The month with the shortest days is December (Average daylight: 8.7h).

  • Average sunshine in May: 9.9h

The month with the most sunshine is July (Average sunshine: 11.8h).
The month with the least sunshine is February (Average sunshine: 5.2h).

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Average sunshine days in May
Billings, MT

Average sunshine days in May - Billings, MT
  • Average sunshine days in May: 11.5 days

The month with the most sunshine days is September (18.8 days).
The month with the least sunshine days is April (9.9 days).

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Average UV index in May
Billings, MT

Average UV index in May - Billings, MT
  • Average UV index in May: 5

The month with the highest UV index is July (UV index 7).
Months with the lowest UV index are January, February, March, November and December (UV index 2).

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Average cloud cover in May
Billings, MT

Average cloud cover in May - Billings, MT
  • Average cloud cover in May: 36

The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 15).

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Average visibility in May
Billings, MT

Average visibility in May - Billings, MT
  • Average visibility in May: 10km

Months with the highest visibility are May, June, July, August, September and October (10km).
Months with the lowest visibility are January, February, March, April, November and December (9km).

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