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 signals a temperature shift, moving from a cool 55.2°F (12.9°C) in April to a refreshing 65.8°F (18.8°C). Throughout May, the average low-temperature in Custer dips to a frosty 46.4°F (8°C).Humidity
In May, the average relative humidity is 55%.Rainfall
May is the month with the most rainfall. Rain falls for 14.3 days and accumulates 1.85" (47mm) of precipitation.Snowfall
Months with snowfall in Custer are January through May, September through December. May is the last month it regularly snows. During 0.6 snowfall days, in May, Custer aggregates 0.16" (4mm) of snow. Throughout the year, in Custer, Montana, there are 48.3 snowfall days, and 17.68" (449mm) of snow is accumulated.Daylight
In May, the average length of the day is 14h and 59min.On the first day of the month, sunrise is at 5:55 am and sunset at 8:19 pm. On the last day of May, sunrise is at 5:22 am and sunset at 8:53 pm MDT.
Sunshine
In Custer, the average sunshine in May is 10.1h.UV index
In Custer, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.Note: In May, the maximum UV index of 5 transforms into these recommendations:
Be vigilant - Suggestions to stave off sun damage are provided. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Frequently asked questions
What is the average May temperature in Custer?
What is the average humidity in May in Custer?
What is the rainiest month in Custer?
How many days does it rain in May in Custer?
What is the last month it snows in Custer?
What is the average length of the day in May in Custer?
When is the sunrise / sunset in May in Custer?
How long on average sun shines in May in Custer?
How high is the UV index in May in Custer?
Average temperature in May
Custer, MT
- Average high temperature in May: 65.8°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The months with the lowest average high temperature are January and December (31.1°F).
- Average low temperature in May: 46.4°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (17.6°F).
Average pressure in May
Custer, MT
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.84"Hg).
Average wind speed in May
Custer, MT
- Average wind speed in May: 9.9mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.2mph).
Average humidity in May
Custer, MT
- Average humidity in May: 55%
The month with the highest relative humidity is January (79%).
The month with the lowest relative humidity is August (38%).
Average rainfall in May
Custer, MT
- Average rainfall in May: 1.85"
The wettest month (with the highest rainfall) is May (1.85").
The driest month (with the least rainfall) is December (0.55").
Average rainfall days in May
Custer, MT
- Average rainfall days in May: 14.3 days
The month with the highest number of rainy days is May (14.3 days).
The month with the least rainy days is December (4.5 days).
Average snowfall in May
Custer, MT
- Average snowfall in May: 0.16"
The month with the highest snowfall is February (4.29").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Custer, MT
- Average snowfall days in May: 0.6 days
The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Custer, MT
- Average daylight in May: 15h and 0min
The month with the longest days is June (Average daylight: 15h and 42min).
The month with the shortest days is December (Average daylight: 8h and 42min).
- Average sunshine in May: 10h and 1min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in May
Custer, MT
- Average sunshine days in May: 14 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is April (13.5 days).
Average UV index in May
Custer, MT
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January, February, March, November and December (UV index 2).
Average cloud cover in May
Custer, MT
- Average cloud cover in May: 34
The month with the most cloud cover is February (Cloud cover 46).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in May
Custer, 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).
Custer, Montana, USA
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