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
As April transitions into May, Great Falls sees a rise in the average high-temperature, moving from a cool 52.3°F (11.3°C) to a refreshing 63°F (17.2°C). In May, Great Falls encounters an average low-temperature of 42.6°F (5.9°C) during the night.Humidity
In May, the average relative humidity is 59%.Rainfall
In Great Falls, in May, during 9 rainfall days, 0.63" (16mm) of precipitation is typically accumulated. Throughout the year, in Great Falls, there are 68.2 rainfall days, and 4.49" (114mm) of precipitation is accumulated.Snowfall
Months with snowfall in Great Falls are January through May, September through December. May is the last month it regularly snows. During 0.9 snowfall days, in May, Great Falls aggregates 0.31" (8mm) of snow. In Great Falls, during the entire year, snow falls for 45.4 days and aggregates up to 11.61" (295mm) of snow.Daylight
The average length of the day in May in Great Falls is 15h and 9min.On the first day of May in Great Falls, sunrise is at 6:06 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 5:31 am and sunset at 9:14 pm MDT.
Sunshine
In Great Falls, 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 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:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the usual temperature for Great Falls in May?
What is the average humidity in May in Great Falls?
How many days does it rain in May in Great Falls?
What is the last month it snows in Great Falls?
How many hours of daylight does Great Falls have in May?
What time are sunrise and sunset in May in Great Falls?
How long on average sun shines in May in Great Falls?
What is the UV index intensity in May in Great Falls?
Average temperature in May
Great Falls, MT
- Average high temperature in May: 63°F
The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is December (30°F).
- Average low temperature in May: 42.6°F
The month with the highest average low temperature is August (57.7°F).
The coldest months (with the lowest average low temperature) are February and December (18.3°F).
Average pressure in May
Great Falls, MT
- Average pressure in May: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.87"Hg).
Average wind speed in May
Great Falls, MT
- Average wind speed in May: 8.5mph
The windiest month (with the highest average wind speed) is November (11.4mph).
The calmest month (with the lowest average wind speed) is August (7.7mph).
Average humidity in May
Great Falls, MT
- Average humidity in May: 59%
The month with the highest relative humidity is January (77%).
The month with the lowest relative humidity is August (40%).
Average rainfall in May
Great Falls, MT
- Average rainfall in May: 0.63"
The wettest month (with the highest rainfall) is June (0.87").
The driest month (with the least rainfall) is December (0.16").
Average rainfall days in May
Great Falls, MT
- Average rainfall days in May: 9 days
The month with the highest number of rainy days is April (9.9 days).
The month with the least rainy days is December (2.7 days).
Average snowfall in May
Great Falls, MT
- Average snowfall in May: 0.31"
The month with the highest snowfall is February (2.09").
The months with the least snowfall are June, July and August (0").
Average snowfall days in May
Great Falls, MT
- Average snowfall days in May: 0.9 days
The month with the highest number of snowfall days is February (10 days).
The months with the least snowfall days are June, July and August (0 days).
Average daylight in May /
Average sunshine in May
Great Falls, MT
- Average daylight in May: 15h and 1min
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: 10h and 2min
The month with the most sunshine is July (Average sunshine: 12h and 6min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 30min).
Average sunshine days in May
Great Falls, MT
- Average sunshine days in May: 20.3 days
The month with the most sunshine days is July (26.1 days).
The months with the least sunshine days are February and April (16.2 days).
Average UV index in May
Great Falls, 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
Great Falls, MT
- Average cloud cover in May: 33
The month with the most cloud cover is February (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 13).
Average visibility in May
Great Falls, 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).
Great Falls, Montana, USA
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