May weather forecastRoundup, MT
May
Weather in May
May brings a significant shift in weather pattern in Roundup, Montana, USA as the city fully embraces spring. Decent temperatures are observed this month with highs hovering around 64.2°F (17.9°C), creating a refreshing and comfortable atmosphere. This month, precipitation remains high with rainfall even surpassing that of April, while snowfall decreases to a minimal level. Consequently, outdoor activities see a surge during this time of year.Temperature
The average high-temperature in Roundup increases in May, moving from a cool 53.8°F (12.1°C) in April to an enjoyable 64.2°F (17.9°C). In the month of May, Roundup witnesses a consistent average low-temperature of 45.7°F (7.6°C).Humidity
In Roundup, the average relative humidity in May is 56%.Rainfall
The month with the most rainfall in Roundup is May, when the rain falls for 15.6 days and typically aggregates up to 1.97" (50mm) of precipitation.Snowfall
Months with snowfall in Roundup are January through May, September through December. May is the last month it regularly snows. During 0.8 snowfall days, in May, Roundup aggregates 0.87" (22mm) of snow. In Roundup, during the entire year, snow falls for 53.5 days and aggregates up to 18.58" (472mm) of snow.Daylight
In Roundup, the average length of the day in May is 15h and 2min.On the first day of the month, sunrise is at 5:58 am and sunset at 8:23 pm. On the last day of May, sunrise is at 5:25 am and sunset at 8:58 pm MDT.
Sunshine
The average sunshine in May in Roundup is 9.8h.UV index
In Roundup, Montana, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 5 in May transforms into this advice:
Exercise caution. Those with pale skin may experience burns in less than half an hour. To guard against the harmful effects of the Sun, minimize exposure during midday. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Roundup, MT
- Average high temperature in May: 64.2°F
The warmest month (with the highest average high temperature) is July (84.7°F).
The month with the lowest average high temperature is December (31.1°F).
- Average low temperature in May: 45.7°F
The month with the highest average low temperature is July (62.4°F).
The coldest month (with the lowest average low temperature) is February (18°F).
Average pressure in May
Roundup, MT
- Average pressure in May: 29.92"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.85"Hg).
Average wind speed in May
Roundup, MT
- Average wind speed in May: 10.2mph
The windiest month (with the highest average wind speed) is January (11.2mph).
The calmest months (with the lowest average wind speed) are July and August (8.5mph).
Average humidity in May
Roundup, MT
- Average humidity in May: 56%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (39%).
Average rainfall in May
Roundup, MT
- Average rainfall in May: 1.97"
The wettest month (with the highest rainfall) is May (1.97").
The driest month (with the least rainfall) is January (0.55").
Average rainfall days in May
Roundup, MT
- Average rainfall days in May: 15.6 days
The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (4.6 days).
Average snowfall in May
Roundup, MT
- Average snowfall in May: 0.87"
The month with the highest snowfall is February (3.78").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Roundup, MT
- Average snowfall days in May: 0.8 days
The month with the highest number of snowfall days is February (11.1 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Roundup, MT
- Average daylight in May: 15h and 0min
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 42min).
- Average sunshine in May: 9h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The months with the least sunshine are February and December (Average sunshine: 5h and 12min).
Average sunshine days in May
Roundup, MT
- Average sunshine days in May: 13.6 days
The month with the most sunshine days is September (19.5 days).
The month with the least sunshine days is April (12.8 days).
Average UV index in May
Roundup, MT
- Average UV index in May: 5
The month with the highest UV index is July (UV index 7).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in May
Roundup, MT
- Average cloud cover in May: 35
The month with the most cloud cover is February (Cloud cover 47).
The months with the least cloud cover are July and August (Cloud cover 16).
Average visibility in May
Roundup, 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).
