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
May's arrival in Boulder is marked by an increase in the average high-temperature, moving from a frosty 45°F (7.2°C) in April to a refreshing 56.7°F (13.7°C). During the month of May, the nighttime temperature falls to an average of 38.3°F (3.5°C).Humidity
In Boulder, the average relative humidity in May is 52%.Rainfall
May is the month with the most rainfall in Boulder. Rain falls for 15.2 days and accumulates 1.73" (44mm) of precipitation.Snowfall
Months with snowfall are January through June, September through December. In May, it is snowing for 4.3 days. Throughout May, 2.36" (60mm) of snow is accumulated. In Boulder, during the entire year, snow falls for 86.8 days and aggregates up to 41.77" (1061mm) of snow.Daylight
The average length of the day in May in Boulder is 14h and 39min.On the first day of the month, sunrise is at 6:11 am and sunset at 8:19 pm. On the last day of May, in Boulder, sunrise is at 5:43 am and sunset at 8:50 pm MDT.
Sunshine
In Boulder, the average sunshine in May is 11.1h.UV index
In May, the average daily maximum UV index in Boulder is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from exposure to the Sun's UV radiation for ordinary individuals.Note: The daily high UV index of 4 during May translates into the following recommendations:
Guard yourself - Precautionary measures against sun damage are advocated. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. 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
What are May temperatures in Boulder?
What is the average humidity in May in Boulder?
What is the wettest month in Boulder?
How much does it rain in Boulder in May?
How much does it snow in Boulder in May?
What is the average length of the day in May in Boulder?
When are sunrise and sunset in May in Boulder?
How long on average sun shines in May in Boulder?
How high is the UV index in May in Boulder?
Average temperature in May
Boulder, WY
- Average high temperature in May: 56.7°F
The warmest month (with the highest average high temperature) is July (78.4°F).
The month with the lowest average high temperature is December (23.9°F).
- Average low temperature in May: 38.3°F
The month with the highest average low temperature is July (55.2°F).
The coldest month (with the lowest average low temperature) is January (5.4°F).
Average pressure in May
Boulder, WY
- Average pressure in May: 29.91"Hg
The month with the highest atmospheric pressure is January (30.27"Hg).
The month with the lowest atmospheric pressure is June (29.9"Hg).
Average wind speed in May
Boulder, WY
- Average wind speed in May: 7.8mph
The windiest month (with the highest average wind speed) is June (8.1mph).
The calmest month (with the lowest average wind speed) is December (5.8mph).
Average humidity in May
Boulder, WY
- Average humidity in May: 52%
The month with the highest relative humidity is February (86%).
The month with the lowest relative humidity is August (34%).
Average rainfall in May
Boulder, WY
- Average rainfall in May: 1.73"
The wettest month (with the highest rainfall) is May (1.73").
The driest month (with the least rainfall) is August (0.51").
Average rainfall days in May
Boulder, WY
- Average rainfall days in May: 15.2 days
The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is January (5.5 days).
Average snowfall in May
Boulder, WY
- Average snowfall in May: 2.36"
The month with the highest snowfall is February (7.32").
The months with the least snowfall are July and August (0").
Average snowfall days in May
Boulder, WY
- Average snowfall days in May: 4.3 days
The month with the highest number of snowfall days is March (15.7 days).
The months with the least snowfall days are July and August (0 days).
Average daylight in May /
Average sunshine in May
Boulder, WY
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in May: 11h and 1min
The months with the most sunshine are July and August (Average sunshine: 11h and 54min).
The month with the least sunshine is January (Average sunshine: 6h and 18min).
Average sunshine days in May
Boulder, WY
- Average sunshine days in May: 9.7 days
The month with the most sunshine days is January (19.8 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in May
Boulder, WY
- 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, April, October, November and December (UV index 2).
Average cloud cover in May
Boulder, WY
- Average cloud cover in May: 25
The month with the most cloud cover is February (Cloud cover 39).
The month with the least cloud cover is August (Cloud cover 11).
Average visibility in May
Boulder, WY
- 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 and February (4mi).
Boulder, Wyoming, USA
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