June weather forecastMount Vernon, IL
June
Weather in June
The first month of the summer, June, is also a moderately hot month in Mount Vernon, Illinois, with an average temperature fluctuating between 66.6°F (19.2°C) and 83.5°F (28.6°C).Temperature
As Mount Vernon enters June, the average high-temperature marginally increases from the a warm 74.8°F (23.8°C) of May to a still moderately hot 83.5°F (28.6°C). An average low-temperature of 66.6°F (19.2°C) marks the month of June.Heat index
Throughout June, the heat index is evaluated at a tropical 91.4°F (33°C). Heightened precautions are necessary, heat cramps and heat exhaustion are potential risks. Continuous activity could lead to heatstroke.Heat index values are typically calculated for conditions of shade and a light breeze. Heat index values may surge by up to 15 Fahrenheit (8 Celsius) degrees in the presence of direct sunlight.
Note: The heat index, also known as 'real feel' or 'felt air temperature', provides an understanding of perceived warmth by combining temperature and relative humidity. The individual's impression of temperature can be affected by numerous factors such as metabolic variations, physical exertion, and attire. Consider that direct sun exposure can intensify the felt heat, adding potentially 15 Fahrenheit (8 Celsius) degrees to the heat index. Heat index values are extremely significant for babies and toddlers. Children often overlook the need for breaks and fluid intake. Thirst is a late-stage sign of dehydration - hence, it is necessary to stay hydrated, especially during extended periods of physical activities.
Humidity
In June, the average relative humidity in Mount Vernon is 77%.Rainfall
In Mount Vernon, during June, the rain falls for 14.9 days and regularly aggregates up to 3.11" (79mm) of precipitation. Throughout the year, in Mount Vernon, there are 145.8 rainfall days, and 29.13" (740mm) of precipitation is accumulated.Snowfall
In Mount Vernon, Illinois, snow does not fall in May through October.Daylight
The month with the longest days in Mount Vernon is June, with an average of 14h and 48min of daylight.On the first day of the month, sunrise is at 5:33 am and sunset at 8:13 pm. On the last day of June, sunrise is at 5:35 am and sunset at 8:23 pm CDT.
Sunshine
With an average of 10.5h of sunshine, June has the most sunshine of the year in Mount Vernon.UV index
May through August, with an average maximum UV index of 6, are months with the highest UV index. A UV Index reading of 6 to 7 represents a high health vulnerability from unsafe exposure to UV radiation for ordinary individuals.Note: In June, the maximum UV index of 6 translates into these guidelines:
Continue precautions and advocate sun safety advice. Deterrence of sunburn is indispensable. Stay in the shade and limit direct sun exposure between 10 a.m. and 4 p.m., when UV radiation is at its strongest. Remember, however, that not all shade structures provide full sun protection. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in June
Mount Vernon, IL
- Average high temperature in June: 83.5°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 (37.9°F).
- Average low temperature in June: 66.6°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in June
Mount Vernon, 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
Mount Vernon, IL
- Average wind speed in June: 7mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in June
Mount Vernon, IL
- Average humidity in June: 77%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in June
Mount Vernon, IL
- Average rainfall in June: 3.11"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in June
Mount Vernon, IL
- Average rainfall days in June: 14.9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in June
Mount Vernon, IL
- Average snowfall in June: 0"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in June
Mount Vernon, IL
- Average snowfall days in June: 0 days
The month with the highest number of snowfall days is January (4.8 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
Mount Vernon, IL
- Average daylight in June: 14h and 48min
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 36min).
- Average sunshine in June: 10h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in June
Mount Vernon, IL
- Average sunshine days in June: 12.8 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in June
Mount Vernon, 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, November and December (UV index 2).
Average cloud cover in June
Mount Vernon, IL
- Average cloud cover in June: 27
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in June
Mount Vernon, 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).
