Contents
- Weather in July
- Frequently asked questions
- Average temperature in July
- Average pressure in July
- Average wind speed in July
- Average humidity in July
- Average rainfall in July
- Average rainfall days in July
- Average snowfall in July
- Average snowfall days in July
- Average daylight in July
- Average sunshine in July
- Average sunshine days in July
- Average UV index in July
- Average cloud cover in July
- Average visibility in July
Weather in July
Temperature
July, characterized by an average high temperature of 85.6°F (29.8°C) and a low temperature of 67.8°F (19.9°C), is generally the warmest month.Heat index
July's heat index is evaluated at a fiery hot 98.6°F (37°C). Take greater precautions, heat exhaustion and heat cramps may be expected. Heatstroke could result from lengthy activity.When assessing, remember that heat index measurements are for light winds and shaded spots. A rise of up to 15 Fahrenheit (8 Celsius) degrees in the heat index could result from direct sunlight.
Note: The heat index, also known as 'real feel' or 'apparent temperature', is an aggregate value of air's warmth and moisture to show the human-felt temperature. One's perception of temperature is subjective, varying based on their activity and individual heat perception, influenced by factors like wind, clothing, and metabolic variations. One should be aware that direct sunshine can amplify the perceived temperature, raising the heat index by as much as 15 Fahrenheit (8 Celsius) degrees. Heat index values are highly critical for babies and toddlers. Children often fail to recognize the requirement to rest and rehydrate. Thirst, being a late symptom of dehydration, underlines the importance of maintaining hydration, especially during ongoing physical activities.
The physiological response of the human body to excess warmth is to perspire, thereby cooling itself through sweat evaporation. A surge in relative humidity can disrupt the body's normal cooling function by slowing evaporation, hence reducing the rate at which the body cools and intensifying the perception of heat. As the body gains more heat than it can dissipate, there's a risk of increasing temperatures and resultant overheating.
Humidity
In July, the average relative humidity is 79%.Rainfall
In Mount Vernon, Illinois, in July, it is raining for 15.9 days, with typically 2.76" (70mm) of accumulated precipitation. Throughout the year, there are 145.8 rainfall days, and 29.13" (740mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall in Mount Vernon.Daylight
The average length of the day in July in Mount Vernon is 14h and 31min.On the first day of the month, sunrise is at 5:36 am and sunset at 8:23 pm. On the last day of July, sunrise is at 5:57 am and sunset at 8:06 pm CDT.
Sunshine
The average sunshine in July is 10.4h.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 unsafe exposure to UV radiation for ordinary individuals.Note: The maximum daily UV index of 6 during July translates into the following directions:
Persist in precautions and follow sun safety policies. Keeping sunburn at bay is imperative. Limit your direct sun exposure, especially between 10 a.m. and 4 p.m., when UV radiation is strongest. Shade structures might not provide complete sun protection. For minimizing sun-related eye damage, always choose sunglasses with UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the hottest in Mount Vernon?
How hot is July in Mount Vernon?
What is the average humidity in July in Mount Vernon?
How many days does it rain in July in Mount Vernon?
When it does not snow in Mount Vernon?
How many hours of daylight does Mount Vernon have in July?
When is the sunrise / sunset in July in Mount Vernon?
How many hours of sunshine does Mount Vernon have in July?
When is the highest UV index in Mount Vernon?
How high is the UV index in July in Mount Vernon?
Average temperature in July
Mount Vernon, IL
- Average high temperature in July: 85.6°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 July: 67.8°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 July
Mount Vernon, IL
- Average pressure in July: 29.98"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 July
Mount Vernon, IL
- Average wind speed in July: 5.9mph
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 July
Mount Vernon, IL
- Average humidity in July: 79%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in July
Mount Vernon, IL
- Average rainfall in July: 2.76"
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 July
Mount Vernon, IL
- Average rainfall days in July: 15.9 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 July
Mount Vernon, IL
- Average snowfall in July: 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 July
Mount Vernon, IL
- Average snowfall days in July: 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 July /
Average sunshine in July
Mount Vernon, IL
- Average daylight in July: 14h and 3min
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 July: 10h and 2min
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 July
Mount Vernon, IL
- Average sunshine days in July: 13.3 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 July
Mount Vernon, IL
- Average UV index in July: 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 July
Mount Vernon, IL
- Average cloud cover in July: 28
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 July
Mount Vernon, IL
- Average visibility in July: 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).
Mount Vernon, Illinois, USA
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