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
The commencement of May sees a shift in the average high-temperature, moving from a mild 56.3°F (13.5°C) in April to a pleasant 68.5°F (20.3°C). In Glen Ellyn, the May nights cool down to an average low of 51.8°F (11°C).Humidity
In Glen Ellyn, Illinois, the average relative humidity in May is 76%.Rainfall
May is the month with the most rainfall. Rain falls for 19.2 days and accumulates 4.45" (113mm) of precipitation.Snowfall
January through May, October through December are months with snowfall in Glen Ellyn, Illinois. May is the last month it regularly snows. During 0.1 snowfall days, in May, Glen Ellyn aggregates 0.04" (1mm) of snow. Throughout the year, in Glen Ellyn, there are 47 snowfall days, and 20.2" (513mm) of snow is accumulated.Daylight
The average length of the day in May is 14h and 34min.On the first day of the month, sunrise is at 5:47 am and sunset at 7:51 pm. On the last day of May, sunrise is at 5:19 am and sunset at 8:20 pm CDT.
Sunshine
In Glen Ellyn, the average sunshine in May is 8.5h.UV index
The average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for the ordinary person.Note: In May, the average maximum UV index of 5 translates into the following recommendations:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. UV radiation from the Sun is most dangerous during midday; take precautions and seek shade. Using UVA and UVB-protective sunglasses and sun-protective clothing is effective against UV radiation. Observe! Snow reflection can nearly intensify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Glen Ellyn in May?
What is the average humidity in May in Glen Ellyn?
What is the wettest month in Glen Ellyn?
How many days does it rain in May in Glen Ellyn?
What is the last month it snows in Glen Ellyn?
How many hours of daylight does Glen Ellyn have in May?
What time are sunrise and sunset in May in Glen Ellyn?
How long on average sun shines in May in Glen Ellyn?
What is the UV index reading in May in Glen Ellyn?
Average temperature in May
Glen Ellyn, IL
- Average high temperature in May: 68.5°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28°F).
- Average low temperature in May: 51.8°F
The month with the highest average low temperature is July (65.3°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in May
Glen Ellyn, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in May
Glen Ellyn, IL
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is January (9.8mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in May
Glen Ellyn, IL
- Average humidity in May: 76%
The months with the highest relative humidity are January and February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in May
Glen Ellyn, IL
- Average rainfall in May: 4.45"
The wettest month (with the highest rainfall) is May (4.45").
The driest months (with the least rainfall) are November and December (1.65").
Average rainfall days in May
Glen Ellyn, IL
- Average rainfall days in May: 19.2 days
The month with the highest number of rainy days is July (20.1 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in May
Glen Ellyn, IL
- Average snowfall in May: 0.04"
The month with the highest snowfall is January (5.87").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
Glen Ellyn, IL
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Glen Ellyn, IL
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 3min
The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Glen Ellyn, IL
- Average sunshine days in May: 9.4 days
The month with the most sunshine days is November (16.1 days).
The month with the least sunshine days is July (8.2 days).
Average UV index in May
Glen Ellyn, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in May
Glen Ellyn, IL
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 61).
The months with the least cloud cover are August and September (Cloud cover 32).
Average visibility in May
Glen Ellyn, IL
- Average visibility in May: 6mi
The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and February (5mi).
Glen Ellyn, Illinois, USA
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