May weather forecast and climate
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
The last month of the spring, May, is an enjoyable month in Billings, Montana, with average temperature ranging between max 64°F (17.8°C) and min 44.2°F (6.8°C).

Temperature

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

Humidity

The average relative humidity in Billings is 59%.

Rainfall

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.

Snowfall

Months with snowfall in Billings, Montana, are January through May, September through December. May is the last month it regularly snows. During 0.7 snowfall days, in May, Billings aggregates 0.28" (7mm) of snow. Throughout the year, in Billings, there are 64.5 snowfall days, and 31.18" (792mm) of snow is accumulated.

Daylight

In Billings, the average length of the day is 15h.

Sunshine

The average sunshine is 9.9h.

UV index

In May, the average daily maximum UV index is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to the UV radiation for the average person.
Note: In May, the average maximum UV index of 5 translate into the following recommendations:
Take precautions - Protection against sun damage is advised. 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.

What is the temperature in May in Billings?

The average high-temperature, in May, is 64°F (17.8°C), while the average low-temperature is 44.2°F (6.8°C).

What is the average humidity in May in Billings?

The average relative humidity in May in Billings, Montana, is 59%.

How many days does it rain in May in Billings?

In Billings, Montana, in May, during 17.6 rainfall days, 2.13" (54mm) of precipitation is typically accumulated.

What is the rainiest month in Billings?

The month with the most rainfall in Billings, Montana, is May when the rain falls for 17.6 days and typically 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. 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 in Billings is 15h.

How long on average sun shines in May in Billings?

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

How high is the UV index in May 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 high temperature in May: 64°F

The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is December (31.1°F).

  • Average low temperature in May: 44.2°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is February (18.3°F).

Average pressure in May - Billings, MT
  • Average pressure in May: 29.92"

The month with the highest atmospheric pressure is January (30.14").
The month with the lowest atmospheric pressure is June (29.86").

Average wind speed in May - Billings, MT
  • Average wind speed in May: 8.6mph

The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest month (with the lowest average wind speed) is July (7.1mph).

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%).

Average rainfall in May - Billings, MT
  • Average rainfall in May: 2.13"

The wettest month (with the highest rainfall) is May (2.13").
The driest month (with the least rainfall) is July (0.71").

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).

Average snowfall in May - Billings, MT
  • Average snowfall in May: 0.28"

The month with the highest snowfall is February (6.5").
Months with the least snowfall are June, July and August (0").

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).

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).

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).

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).

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).

Average visibility in May - Billings, MT
  • Average visibility in May: 6mi

Months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).