May weather forecastRiver Grove, IL
May
Weather in May
The last month of the spring, May, is an enjoyable month in River Grove, Illinois, with temperature in the range of an average low of 51.4°F (10.8°C) and an average high of 64.4°F (18°C).Temperature
The start of May brings a rise in the average high-temperature, moving from a fresh 53.2°F (11.8°C) in April to an enjoyable 64.4°F (18°C). The average low-temperature, in May, is a fresh 51.4°F (10.8°C).Humidity
In River Grove, the average relative humidity in May is 77%.Rainfall
May is the month with the most rainfall in River Grove, Illinois. Rain falls for 18.8 days and accumulates 4.49" (114mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. May is the last month it regularly snows in River Grove, Illinois. During 0.1 snowfall days, in May, River Grove aggregates 0.08" (2mm) of snow. Throughout the year, in River Grove, there are 40.3 snowfall days, and 16.81" (427mm) of snow is accumulated.Daylight
The average length of the day in May in River Grove, Illinois, is 14h and 35min.On the first day of the month, sunrise is at 5:46 am and sunset at 7:50 pm. On the last day of May, in River Grove, sunrise is at 5:18 am and sunset at 8:19 pm CDT.
Sunshine
In May, the average sunshine in River Grove is 8.7h.UV index
The average daily maximum UV index in May in River Grove is 5. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: A maximum daily UV index of 5 during May morphs into the following directions:
Heed the precautions - Protecting the skin and eyes from damage is compulsory. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. A wide-brimmed hat is a shield, deflecting up to 50% of harmful UV radiation from eyes. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
River Grove, IL
- Average high temperature in May: 64.4°F
The warmest month (with the highest average high temperature) is July (79.7°F).
The month with the lowest average high temperature is January (28.9°F).
- Average low temperature in May: 51.4°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (19.4°F).
Average pressure in May
River Grove, 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
River Grove, IL
- Average wind speed in May: 8.7mph
The windiest month (with the highest average wind speed) is January (11.1mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in May
River Grove, IL
- Average humidity in May: 77%
The month with the highest relative humidity is January (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
River Grove, IL
- Average rainfall in May: 4.49"
The wettest month (with the highest rainfall) is May (4.49").
The driest month (with the least rainfall) is December (1.57").
Average rainfall days in May
River Grove, IL
- Average rainfall days in May: 18.8 days
The month with the highest number of rainy days is May (18.8 days).
The month with the least rainy days is February (5.1 days).
Average snowfall in May
River Grove, IL
- Average snowfall in May: 0.08"
The month with the highest snowfall is February (4.69").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in May
River Grove, IL
- Average snowfall days in May: 0.1 days
The month with the highest number of snowfall days is January (10.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
River Grove, IL
- Average daylight in May: 14h and 36min
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 42min
The month with the most sunshine is August (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
River Grove, IL
- Average sunshine days in May: 10.4 days
The month with the most sunshine days is December (16.7 days).
The month with the least sunshine days is July (9.9 days).
Average UV index in May
River Grove, IL
- Average UV index in May: 5
The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
River Grove, IL
- Average cloud cover in May: 41
The month with the most cloud cover is January (Cloud cover 61).
The month with the least cloud cover is August (Cloud cover 27).
Average visibility in May
River Grove, IL
- 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).
