Contents
- Weather in June
- Frequently asked questions
- Average temperature in June
- Average pressure in June
- Average wind speed in June
- Average humidity in June
- Average rainfall in June
- Average rainfall days in June
- Average snowfall in June
- Average snowfall days in June
- Average daylight in June
- Average sunshine in June
- Average sunshine days in June
- Average UV index in June
- Average cloud cover in June
- Average visibility in June
Weather in June
Temperature
June brings a slight increase in the average high-temperature, progressing from a warm 74.8°F (23.8°C) in May to a still moderately hot 83.7°F (28.7°C). O'Fallon's average low-temperature during June nights is observed to be a comfortable 66.6°F (19.2°C).Heat index
June's average heat index is appraised at a hot 91.4°F (33°C). Extra safeguards are necessary to prevent heat exhaustion and heat cramps. Prolonged activity might cause heatstroke.Realize that the values for the heat index are set for shaded places and light winds. Exposure to the direct sun might augment heat index values by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'apparent temperature' or 'real feel', joins air temperature with relative humidity to produce a temperature perception for humans. The individual's temperature perception can be influenced by numerous factors such as metabolic variations, physical activity, and clothing. Under direct sun rays, the felt temperature might be heightened, with the heat index increasing by 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly important for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
Humidity
The average relative humidity in June is 77%.Rainfall
In O'Fallon, during June, the rain falls for 11.1 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in O'Fallon, there are 108.8 rainfall days, and 10.24" (260mm) of precipitation is accumulated.Snowfall
In O'Fallon, snow does not fall in April through October.Daylight
With an average of 14h and 48min of daylight, June has the longest days of the year.On the first day of June in O'Fallon, sunrise is at 5:36 am and sunset at 8:18 pm. On the last day of the month, sunrise is at 5:38 am and sunset at 8:28 pm CDT.
Sunshine
June and July, with an average of 10.4h of sunshine, are months with the most sunshine.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index value of 6 to 7 symbolizes a high health vulnerability from exposure to the Sun's UV rays for average individuals.Note: The maximum daily UV index of 6 in June interprets into the following recommendations:
Stick with precautions and abide by sun safety procedures. Evading sunburn is essential. The time between 10 a.m. and 4 p.m. is when UV radiation is at its peak. Limit exposure to direct sunlight during these hours. For excellent sun protection for the eyes, ears, face, and neck, consider a wide-brim hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
How hot does it get in O'Fallon in June?
What is the average humidity in June in O'Fallon?
How many days does it rain in June?
When it does not snow?
When are the longest days?
What is the average length of the day in June?
What time are sunrise and sunset in June?
What are the months with the most sunshine?
How long on average sun shines in June?
What are the months with the highest UV index in O'Fallon?
How high is the UV index in June?
Average temperature in June
O'Fallon, IL
- Average high temperature in June: 83.7°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.8°F).
- Average low temperature in June: 66.6°F
The month with the highest average low temperature is July (68.2°F).
The coldest month (with the lowest average low temperature) is January (24.6°F).
Average pressure in June
O'Fallon, IL
- Average pressure in June: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in June
O'Fallon, IL
- Average wind speed in June: 6.6mph
The windiest month (with the highest average wind speed) is January (9.5mph).
The calmest month (with the lowest average wind speed) is July (5.6mph).
Average humidity in June
O'Fallon, IL
- Average humidity in June: 77%
The months with the highest relative humidity are May, July and August (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in June
O'Fallon, IL
- Average rainfall in June: 1.14"
The wettest month (with the highest rainfall) is July (1.42").
The driest month (with the least rainfall) is December (0.31").
Average rainfall days in June
O'Fallon, IL
- Average rainfall days in June: 11.1 days
The month with the highest number of rainy days is July (13.1 days).
The month with the least rainy days is December (4.6 days).
Average snowfall in June
O'Fallon, IL
- Average snowfall in June: 0"
The month with the highest snowfall is January (0.51").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in June
O'Fallon, IL
- Average snowfall days in June: 0 days
The month with the highest number of snowfall days is January (4.7 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in June /
Average sunshine in June
O'Fallon, IL
- Average daylight in June: 14h and 5min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in June: 10h and 2min
The months with the most sunshine are June and July (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in June
O'Fallon, IL
- Average sunshine days in June: 16.2 days
The month with the most sunshine days is December (23.6 days).
The months with the least sunshine days are May and July (15.5 days).
Average UV index in June
O'Fallon, IL
- Average UV index in June: 6
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in June
O'Fallon, IL
- Average cloud cover in June: 29
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in June
O'Fallon, IL
- Average visibility in June: 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).
O'Fallon, Illinois, USA
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