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 onset is marked by a temperature increase, moving from a refreshing 56.3°F (13.5°C) in April to a pleasant 68.5°F (20.3°C). During the month of May, the temperature generally drops to a low average of 51.3°F (10.7°C).Humidity
The average relative humidity in May is 78%.Rainfall
May is the month with the most rainfall. Rain falls for 13.8 days and accumulates 1.18" (30mm) of precipitation.Snowfall
May through September are months without snowfall in Stillman Valley.Daylight
In Stillman Valley, the average length of the day in May is 14h and 35min.On the first day of May in Stillman Valley, sunrise is at 5:51 am and sunset at 7:56 pm. On the last day of the month, sunrise is at 5:23 am and sunset at 8:25 pm CDT.
Sunshine
In May, the average sunshine is 8.5h.UV index
In Stillman Valley, the average daily maximum UV index in May is 5. A UV Index value of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the average person.Note: The daily maximum UV index of 5 in May interprets into the following advice:
Undertake protective steps - Recommendations to avoid sunburn are issued. Sun's radiation is most powerful around mid-day, so it's best to limit outdoor activities during this time. Experience reduced UV exposure by about half when donning a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average May temperature in Stillman Valley?
What is the average humidity in May in Stillman Valley?
What is the rainiest month in Stillman Valley?
How much does it rain in Stillman Valley in May?
When it does not snow in Stillman Valley?
Does it snow in Stillman Valley in May?
What is the average length of the day in May in Stillman Valley?
When is the sunrise / sunset in May in Stillman Valley?
How long on average sun shines in May in Stillman Valley?
How high is the UV index in May in Stillman Valley?
Average temperature in May
Stillman Valley, IL
- Average high temperature in May: 68.5°F
The warmest month (with the highest average high temperature) is July (79.9°F).
The month with the lowest average high temperature is January (26.2°F).
- Average low temperature in May: 51.3°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (14°F).
Average pressure in May
Stillman Valley, IL
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in May
Stillman Valley, IL
- Average wind speed in May: 8.6mph
The windiest month (with the highest average wind speed) is April (10.2mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).
Average humidity in May
Stillman Valley, IL
- Average humidity in May: 78%
The month with the highest relative humidity is January (86%).
The months with the lowest relative humidity are April and October (75%).
Average rainfall in May
Stillman Valley, IL
- Average rainfall in May: 1.18"
The wettest month (with the highest rainfall) is May (1.18").
The driest months (with the least rainfall) are January and February (0.35").
Average rainfall days in May
Stillman Valley, IL
- Average rainfall days in May: 13.8 days
The month with the highest number of rainy days is May (13.8 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in May
Stillman Valley, IL
- Average snowfall in May: 0"
The month with the highest snowfall is January (1.42").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in May
Stillman Valley, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (8.1 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
Stillman Valley, 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 July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in May
Stillman Valley, IL
- Average sunshine days in May: 15.4 days
The month with the most sunshine days is December (22.6 days).
The month with the least sunshine days is June (12.8 days).
Average UV index in May
Stillman Valley, IL
- Average UV index in May: 5
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in May
Stillman Valley, IL
- Average cloud cover in May: 43
The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is September (Cloud cover 33).
Average visibility in May
Stillman Valley, IL
- Average visibility in May: 6mi
The months with the highest visibility are February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, July and August (5mi).
Stillman Valley, Illinois, USA
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