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
With the arrival of May, the average high-temperature transitions from a cool 54.9°F (12.7°C) in April to a comfortable 65.7°F (18.7°C). Riverdale experiences an average temperature drop to a fresh 51.8°F (11°C) during May nights.Humidity
In May, the average relative humidity is 77%.Rainfall
The wettest months are May and June, with an average 1.38" (35mm) of rainfall.Snowfall
May through September are months without snowfall in Riverdale.Daylight
In May, the average length of the day is 14h and 33min.On the first day of the month, sunrise is at 5:46 am and sunset at 7:49 pm. On the last day of May, sunrise is at 5:18 am and sunset at 8:18 pm CDT.
Sunshine
In May, the average sunshine is 8.7h.UV index
In Riverdale, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the ordinary person.Note: In May, a daily maximum UV index of 5 leads to the following instructions:
Take measures. Individuals with light skin might experience burns in under 30 minutes. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Frequently asked questions
What is the average May temperature in Riverdale?
What is the average humidity in May in Riverdale?
What is the wettest month in Riverdale?
How many days does it rain in May in Riverdale?
When it does not snow in Riverdale?
Does it snow in Riverdale in May?
How many hours of daylight does Riverdale have in May?
When are sunrise and sunset in May in Riverdale?
How many hours of sunshine does Riverdale have in May?
What is the UV index reading in May in Riverdale?
Average temperature in May
Riverdale, IL
- Average high temperature in May: 65.7°F
The warmest month (with the highest average high temperature) is July (80.1°F).
The month with the lowest average high temperature is January (29.8°F).
- Average low temperature in May: 51.8°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (19.6°F).
Average pressure in May
Riverdale, IL
- Average pressure in May: 29.97"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
Riverdale, IL
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is January (11mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).
Average humidity in May
Riverdale, IL
- Average humidity in May: 77%
The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is October (72%).
Average rainfall in May
Riverdale, IL
- Average rainfall in May: 1.38"
The wettest months (with the highest rainfall) are May and June (1.38").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in May
Riverdale, IL
- Average rainfall days in May: 13.1 days
The month with the highest number of rainy days is July (14 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in May
Riverdale, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.1").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Riverdale, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (9.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Riverdale, IL
- Average daylight in May: 14h and 4min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in May: 8h and 4min
The month with the most sunshine is August (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 3h and 36min).
Average sunshine days in May
Riverdale, IL
- Average sunshine days in May: 14.3 days
The month with the most sunshine days is December (19.8 days).
The month with the least sunshine days is June (13.1 days).
Average UV index in May
Riverdale, 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 December (UV index 1).
Average cloud cover in May
Riverdale, IL
- Average cloud cover in May: 42
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in May
Riverdale, 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).
Riverdale, Illinois, USA
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