May weather forecastHelmville, MT
May
Weather in May
The last month of the spring, May, is a refreshing month in Helmville, Montana, with an average temperature fluctuating between 33.1°F (0.6°C) and 57.4°F (14.1°C).Temperature
Helmville's May weather brings a rise in high-temperatures, moving from a frosty 45.3°F (7.4°C) in April to a moderate 57.4°F (14.1°C). A steady average of 33.1°F (0.6°C) throughout May underscores a considerable divergence from the daytime high.Humidity
In Helmville, the average relative humidity in May is 68%.Rainfall
In Helmville, in May, during 13 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. Throughout the year, there are 114.8 rainfall days, and 12.13" (308mm) of precipitation is accumulated.Snowfall
Months with snowfall in Helmville, Montana, are January through June, September through December. In Helmville, during May, snow falls for 1.6 days and regularly aggregates up to 0.55" (14mm) of snow. Throughout the year, in Helmville, there are 86.9 snowfall days, and 39.96" (1015mm) of snow is accumulated.Daylight
In May, the average length of the day in Helmville is 15h and 4min.On the first day of the month, sunrise is at 6:15 am and sunset at 8:42 pm. On the last day of May, sunrise is at 5:41 am and sunset at 9:18 pm MDT.
Sunshine
In May, the average sunshine in Helmville, Montana, is 10.7h.UV index
The average daily maximum UV index in May in Helmville is 4. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, the maximum UV index of 4 suggests these recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. When the Sun is at its strongest around midday, find shade and limit exposure. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses. 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
Average temperature in May
Helmville, MT
- Average high temperature in May: 57.4°F
The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is December (26.6°F).
- Average low temperature in May: 33.1°F
The month with the highest average low temperature is August (46.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in May
Helmville, MT
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Helmville, MT
- Average wind speed in May: 5.4mph
The windiest month (with the highest average wind speed) is April (6mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in May
Helmville, MT
- Average humidity in May: 68%
The months with the highest relative humidity are January and February (89%).
The months with the lowest relative humidity are July and August (49%).
Average rainfall in May
Helmville, MT
- Average rainfall in May: 1.3"
The wettest month (with the highest rainfall) is June (1.81").
The driest months (with the least rainfall) are August, September and October (0.59").
Average rainfall days in May
Helmville, MT
- Average rainfall days in May: 13 days
The month with the highest number of rainy days is June (13.3 days).
The month with the least rainy days is November (6.5 days).
Average snowfall in May
Helmville, MT
- Average snowfall in May: 0.55"
The month with the highest snowfall is February (9.76").
The months with the least snowfall are July and August (0").
Average snowfall days in May
Helmville, MT
- Average snowfall days in May: 1.6 days
The month with the highest number of snowfall days is February (18.1 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in May /
Average sunshine in May
Helmville, MT
- Average daylight in May: 15h and 6min
The month with the longest days is June (Average daylight: 15h and 48min).
The month with the shortest days is December (Average daylight: 8h and 36min).
- Average sunshine in May: 10h and 42min
The month with the most sunshine is July (Average sunshine: 11h and 54min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in May
Helmville, MT
- Average sunshine days in May: 15.2 days
The month with the most sunshine days is September (21.9 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in May
Helmville, MT
- Average UV index in May: 4
The month with the highest UV index is July (UV index 5).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in May
Helmville, MT
- Average cloud cover in May: 32
The month with the most cloud cover is February (Cloud cover 50).
The months with the least cloud cover are July and August (Cloud cover 13).
Average visibility in May
Helmville, MT
- Average visibility in May: 6mi
The months with the highest visibility are May, June, July, August, September and October (6mi).
The months with the lowest visibility are January, February and December (4mi).
