May weather forecast
Heart Butte, MT

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Weather in May

The last month of the spring, May, is a mild month in Heart Butte, Montana, with temperature in the range of an average low of 42.4°F (5.8°C) and an average high of 60.3°F (15.7°C).

Temperature

May's arrival brings a temperature shift, moving from a frosty 49.6°F (9.8°C) in April to a refreshing 60.3°F (15.7°C). Heart Butte experiences an average low-temperature of 42.4°F (5.8°C) in month of May.

Humidity

In May, the average relative humidity is 56%.

Rainfall

In May, the rain falls for 10.4 days. Throughout May, 1.3" (33mm) of precipitation is accumulated. Throughout the year, in Heart Butte, there are 70.4 rainfall days, and 8.46" (215mm) of precipitation is accumulated.

Snowfall

January through May, September through December are months with snowfall. May is the last month it regularly snows. During 1.3 snowfall days, in May, Heart Butte aggregates 0.79" (20mm) of snow. Throughout the year, in Heart Butte, Montana, there are 54.3 snowfall days, and 19.49" (495mm) of snow is accumulated.

Daylight

In May, the average length of the day is 15h and 14min.
On the first day of the month, sunrise is at 6:10 am and sunset at 8:45 pm. On the last day of May, sunrise is at 5:34 am and sunset at 9:23 pm MDT.

Sunshine

In Heart Butte, the average sunshine in May is 10.3h.

UV index

In May, the average daily maximum UV index is 4. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for the ordinary person.
Note: In May, the maximum UV index of 4 suggests this advice:
Adopt protective measures - Suggestions to resist sunburn are offered. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Stay sun-safe with clothing that is both closely woven and worn loosely. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.

Frequently asked questions

What are the temperatures in May?

The average high-temperature, in May, in Heart Butte, is 60.3°F (15.7°C), while the average low-temperature is 42.4°F (5.8°C).

What is the average humidity in May?

In May, the average relative humidity is 56%.

How many days does it rain in May?

In Heart Butte, Montana, in May, it is raining for 10.4 days, with typically 1.3" (33mm) of accumulated precipitation.

What is the last month it snows?

May is the last month it regularly snows. During 1.3 snowfall days, in May, Heart Butte aggregates 0.79" (20mm) of snow.

How many hours of daylight does Heart Butte have in May?

In Heart Butte, the average day length in May is 15h and 14min.

When are sunrise and sunset in May in Heart Butte?

In May, on the first day of the month, sunrise is at 6:10 am and sunset at 8:45 pm. On the last day of the month, sunrise is at 5:34 am and sunset at 9:23 pm MDT.

How many hours of sunshine does Heart Butte have in May?

The average sunshine duration in May is 10.3h.

What is the UV index intensity in May?

The average daily maximum UV index in May is 4. A UV Index of 3 to 5 symbolizes a moderate health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in May
Heart Butte, MT

Average temperature in May - Heart Butte, MT
  • Average high temperature in May: 60.3°F

The warmest month (with the highest average high temperature) is July (78.8°F).
The month with the lowest average high temperature is December (27.1°F).

  • Average low temperature in May: 42.4°F

The month with the highest average low temperature is August (55.2°F).
The coldest month (with the lowest average low temperature) is December (15.3°F).

Average pressure in May
Heart Butte, MT

Average pressure in May - Heart Butte, MT
  • Average pressure in May: 29.93"Hg

The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).

Average wind speed in May
Heart Butte, MT

Average wind speed in May - Heart Butte, MT
  • Average wind speed in May: 9.9mph

The windiest month (with the highest average wind speed) is January (11.8mph).
The calmest months (with the lowest average wind speed) are July and August (8.8mph).

Average humidity in May
Heart Butte, MT

Average humidity in May - Heart Butte, MT
  • Average humidity in May: 56%

The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (43%).

Average rainfall in May
Heart Butte, MT

Average rainfall in May - Heart Butte, MT
  • Average rainfall in May: 1.3"

The wettest month (with the highest rainfall) is June (1.77").
The driest month (with the least rainfall) is July (0.31").

Average rainfall days in May
Heart Butte, MT

Average rainfall days in May - Heart Butte, MT
  • Average rainfall days in May: 10.4 days

The month with the highest number of rainy days is May (10.4 days).
The month with the least rainy days is November (2.6 days).

Average snowfall in May
Heart Butte, MT

Average snowfall in May - Heart Butte, MT
  • Average snowfall in May: 0.79"

The month with the highest snowfall is February (3.58").
The months with the least snowfall are June, July and August (0").

Average snowfall days in May
Heart Butte, MT

Average snowfall days in May - Heart Butte, MT
  • Average snowfall days in May: 1.3 days

The month with the highest number of snowfall days is December (10.2 days).
The months with the least snowfall days are July and August (0 days).

Average daylight in May /
Average sunshine in May
Heart Butte, MT

Average daylight in May / Average sunshine in May - Heart Butte, MT
  • Average daylight in May: 15h and 1min

The month with the longest days is June (Average daylight: 16h and 0min).
The month with the shortest days is December (Average daylight: 8h and 24min).

  • Average sunshine in May: 10h and 2min

The month with the most sunshine is July (Average sunshine: 12h and 0min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).

Average sunshine days in May
Heart Butte, MT

Average sunshine days in May - Heart Butte, MT
  • Average sunshine days in May: 17.8 days

The month with the most sunshine days is July (23.5 days).
The month with the least sunshine days is April (17.4 days).

Average UV index in May
Heart Butte, MT

Average UV index in May - Heart Butte, MT
  • Average UV index in May: 4

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, March, October, November and December (UV index 2).

Average cloud cover in May
Heart Butte, MT

Average cloud cover in May - Heart Butte, MT
  • Average cloud cover in May: 33

The month with the most cloud cover is February (Cloud cover 43).
The month with the least cloud cover is July (Cloud cover 15).

Average visibility in May
Heart Butte, MT

Average visibility in May - Heart Butte, MT
  • Average visibility in May: 6mi

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

Heart Butte, Montana, USA

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