Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
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.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are the temperatures in May?
What is the average humidity in May?
How many days does it rain in May?
What is the last month it snows?
How many hours of daylight does Heart Butte have in May?
When are sunrise and sunset in May in Heart Butte?
How many hours of sunshine does Heart Butte have in May?
What is the UV index intensity in May?
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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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: 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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