May weather forecastPlains, MT
May
Weather in May
The last month of the spring, May, is a refreshing month in Plains, Montana, with an average temperature ranging between min 34.3°F (1.3°C) and max 60.1°F (15.6°C).Temperature
May comes with an increase, with the average high-temperature moving from a frosty 47.1°F (8.4°C) in April to a mild 60.1°F (15.6°C). Throughout May, Plains registers a distinct decrease from daytime highs, reaching an average low of 34.3°F (1.3°C).Humidity
The average relative humidity in May is 71%.Rainfall
In Plains, in May, during 14.4 rainfall days, 1.57" (40mm) of precipitation is typically accumulated. In Plains, during the entire year, the rain falls for 152.1 days and collects up to 22.09" (561mm) of precipitation.Snowfall
January through May, September through December are months with snowfall in Plains. May is the last month it regularly snows. During 0.4 snowfall days, in May, Plains aggregates 0.12" (3mm) of snow. Throughout the year, in Plains, there are 90.2 snowfall days, and 58.15" (1477mm) of snow is accumulated.Daylight
The average length of the day in May is 15h and 8min.On the first day of May in Plains, sunrise is at 6:21 am and sunset at 8:51 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 9:28 pm MDT.
Sunshine
In May, the average sunshine is 9.8h.UV index
In May, the average daily maximum UV index in Plains is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from unprotected exposure to Sun's UV rays for ordinary individuals.Note: The daily high UV index of 4 in May translates into this advice:
Preventative actions are necessary - Recommendations to ward off sunburn are given. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. For a sun-safe wardrobe, go for clothes that are tightly woven and generously sized. Take to heart! Snow reflection can almost 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
Plains, MT
- Average high temperature in May: 60.1°F
The warmest months (with the highest average high temperature) are July and August (78.8°F).
The month with the lowest average high temperature is December (28.9°F).
- Average low temperature in May: 34.3°F
The month with the highest average low temperature is August (45.7°F).
The coldest month (with the lowest average low temperature) is December (16.2°F).
Average pressure in May
Plains, 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 (29.93"Hg).
Average wind speed in May
Plains, MT
- Average wind speed in May: 4.4mph
The windiest month (with the highest average wind speed) is April (4.9mph).
The calmest month (with the lowest average wind speed) is December (4mph).
Average humidity in May
Plains, MT
- Average humidity in May: 71%
The month with the highest relative humidity is January (93%).
The months with the lowest relative humidity are July and August (53%).
Average rainfall in May
Plains, MT
- Average rainfall in May: 1.57"
The wettest month (with the highest rainfall) is January (3.11").
The driest month (with the least rainfall) is August (0.39").
Average rainfall days in May
Plains, MT
- Average rainfall days in May: 14.4 days
The month with the highest number of rainy days is March (19.9 days).
The month with the least rainy days is August (5.9 days).
Average snowfall in May
Plains, MT
- Average snowfall in May: 0.12"
The month with the highest snowfall is February (15.12").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Plains, MT
- Average snowfall days in May: 0.4 days
The month with the highest number of snowfall days is December (20.4 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Plains, MT
- Average daylight in May: 15h and 6min
The month with the longest days is June (Average daylight: 15h and 54min).
The month with the shortest days is December (Average daylight: 8h and 30min).
- Average sunshine in May: 9h and 48min
The month with the most sunshine is July (Average sunshine: 11h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in May
Plains, MT
- Average sunshine days in May: 14.2 days
The months with the most sunshine days are July and August (23.3 days).
The month with the least sunshine days is March (5.8 days).
Average UV index in May
Plains, 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, November and December (UV index 1).
Average cloud cover in May
Plains, MT
- Average cloud cover in May: 38
The month with the most cloud cover is February (Cloud cover 66).
The months with the least cloud cover are July and August (Cloud cover 15).
Average visibility in May
Plains, MT
- Average visibility in May: 5mi
The months with the highest visibility are June, July, August and September (6mi).
The months with the lowest visibility are January, February and December (3mi).
