May weather forecastBoulder, MT
May
Weather in May
May, the last month of the spring in Boulder, is a moderate month, with an average temperature ranging between min 35.2°F (1.8°C) and max 58.5°F (14.7°C).Temperature
The arrival of May brings a temperature shift, with the average high-temperature escalating from a chilly 46.4°F (8°C) in April to a refreshing 58.5°F (14.7°C). Boulder documents a significant temperature variance in May, with the mean nighttime lows settling at an icy 35.2°F (1.8°C).Humidity
In Boulder, the average relative humidity in May is 64%.Rainfall
In Boulder, in May, during 18.2 rainfall days, 2.36" (60mm) of precipitation is typically accumulated. In Boulder, Montana, during the entire year, the rain falls for 133.7 days and collects up to 16.38" (416mm) of precipitation.Snowfall
January through June, September through December are months with snowfall. In Boulder, in May, during 4.4 snowfall days, 2.64" (67mm) of snow is typically accumulated. In Boulder, during the entire year, snow falls for 105.8 days and aggregates up to 55.12" (1400mm) of snow.Daylight
The average length of the day in May in Boulder is 15h and 1min.On the first day of May, sunrise is at 6:13 am and sunset at 8:37 pm. On the last day of the month, sunrise is at 5:40 am and sunset at 9:12 pm MDT.
Sunshine
In Boulder, Montana, the average sunshine in May is 10.2h.UV index
In Boulder, Montana, the average daily maximum UV index in May 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: The average daily UV index of 4 in May transforms into the following instructions:
Guard yourself - An obligation to protect skin and eyes from harm exists. UV radiation is strongest from the Sun during midday; protect yourself by staying in shaded areas. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Bear in mind! The Sun's UV radiation can nearly double in intensity due to the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Boulder, MT
- Average high temperature in May: 58.5°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is December (27°F).
- Average low temperature in May: 35.2°F
The month with the highest average low temperature is August (48.6°F).
The coldest month (with the lowest average low temperature) is December (12.6°F).
Average pressure in May
Boulder, MT
- Average pressure in May: 29.95"Hg
The month with the highest atmospheric pressure is January (30.19"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Boulder, MT
- Average wind speed in May: 5.4mph
The windiest months (with the highest average wind speed) are January and November (6.5mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in May
Boulder, MT
- Average humidity in May: 64%
The month with the highest relative humidity is January (86%).
The month with the lowest relative humidity is August (46%).
Average rainfall in May
Boulder, MT
- Average rainfall in May: 2.36"
The wettest month (with the highest rainfall) is June (2.68").
The driest month (with the least rainfall) is December (0.79").
Average rainfall days in May
Boulder, MT
- Average rainfall days in May: 18.2 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (7.5 days).
Average snowfall in May
Boulder, MT
- Average snowfall in May: 2.64"
The month with the highest snowfall is February (9.72").
The months with the least snowfall are July and August (0").
Average snowfall days in May
Boulder, MT
- Average snowfall days in May: 4.4 days
The month with the highest number of snowfall days is February (18 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in May /
Average sunshine in May
Boulder, 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 12min
The month with the most sunshine is July (Average sunshine: 11h and 42min).
The months with the least sunshine are January and December (Average sunshine: 5h and 36min).
Average sunshine days in May
Boulder, MT
- Average sunshine days in May: 9.3 days
The month with the most sunshine days is September (17.9 days).
The month with the least sunshine days is February (8.5 days).
Average UV index in May
Boulder, MT
- Average UV index in May: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is February (UV index 1).
Average cloud cover in May
Boulder, MT
- Average cloud cover in May: 34
The month with the most cloud cover is February (Cloud cover 48).
The month with the least cloud cover is August (Cloud cover 15).
Average visibility in May
Boulder, MT
- Average visibility in May: 6mi
The months with the highest visibility are April, May, June, July, August, September, October and November (6mi).
The months with the lowest visibility are January, February, March and December (5mi).
