July weather forecastPreston Heights, IL
July
Weather in July
July, like June, in Preston Heights, Illinois, is a moderately hot summer month, with temperature in the range of an average low of 64.8°F (18.2°C) and an average high of 81.3°F (27.4°C).Temperature
July is the warmest month, with the temperature often reaching an average high of 81.3°F (27.4°C) and an average low of 64.8°F (18.2°C).Heat index
Throughout July, the heat index is estimated at a tropical 87.8°F (31°C). Continuing activity during long-lasting exposure might induce tiredness and result in heat cramps.It is important to note that the heat index values are for shaded areas and light wind scenarios. Under direct sunshine, the heat index values might be elevated by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'real feel' or 'feels like', takes into account both air temperature and humidity to illustrate what people actually feel. The influence of weather can be personal, changing with an individual's body mass, height, and level of physical exertion. Given direct exposure to sunlight, one might experience a rise in the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are quite important for children. Typically, children face more danger than adults as they usually perspire less. Their larger skin surface relative to their small bodies and increased heat output from their activities enhance their risk.
Humidity
In July, the average relative humidity in Preston Heights is 82%.Rainfall
In Preston Heights, during July, the rain falls for 17.9 days and regularly aggregates up to 3.46" (88mm) of precipitation. Throughout the year, there are 153.6 rainfall days, and 32.72" (831mm) of precipitation is accumulated.Snowfall
May through October are months without snowfall.Daylight
In Preston Heights, the average length of the day in July is 14h and 50min.On the first day of July, sunrise is at 5:22 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:10 pm CDT.
Sunshine
In Preston Heights, the average sunshine in July is 9.6h.UV index
The months with the highest UV index in Preston Heights are June and July, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high threat to health from exposure to the Sun's UV radiation for the ordinary person.Note: In July, a daily UV index of 6 turns into the following recommendations:
Act on precautions and pay attention to sun safety recommendations. Avoidance of sunburn is obligatory. From 10 a.m. to 4 p.m., when UV radiation is at its strongest, limit direct exposure to the Sun and note that shade structures may not provide full sun protection. Loose clothes with a tight weave are optimal for safeguarding yourself against the Sun's rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Preston Heights, IL
- Average high temperature in July: 81.3°F
The warmest month (with the highest average high temperature) is July (81.3°F).
The month with the lowest average high temperature is January (29.3°F).
- Average low temperature in July: 64.8°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).
Average pressure in July
Preston Heights, IL
- Average pressure in July: 29.97"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in July
Preston Heights, IL
- Average wind speed in July: 6.2mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (5.9mph).
Average humidity in July
Preston Heights, IL
- Average humidity in July: 82%
The month with the highest relative humidity is February (83%).
The month with the lowest relative humidity is October (73%).
Average rainfall in July
Preston Heights, IL
- Average rainfall in July: 3.46"
The wettest month (with the highest rainfall) is May (4.41").
The driest month (with the least rainfall) is February (1.61").
Average rainfall days in July
Preston Heights, IL
- Average rainfall days in July: 17.9 days
The month with the highest number of rainy days is July (17.9 days).
The month with the least rainy days is February (5.7 days).
Average snowfall in July
Preston Heights, IL
- Average snowfall in July: 0"
The month with the highest snowfall is January (4.33").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in July
Preston Heights, IL
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (11.9 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in July /
Average sunshine in July
Preston Heights, IL
- Average daylight in July: 14h and 48min
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 July: 9h and 36min
The month with the most sunshine is August (Average sunshine: 9h and 42min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in July
Preston Heights, IL
- Average sunshine days in July: 10.8 days
The month with the most sunshine days is November (18.1 days).
The month with the least sunshine days is June (10.4 days).
Average UV index in July
Preston Heights, IL
- Average UV index in July: 6
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in July
Preston Heights, IL
- Average cloud cover in July: 36
The month with the most cloud cover is January (Cloud cover 60).
The months with the least cloud cover are August and September (Cloud cover 34).
Average visibility in July
Preston Heights, IL
- Average visibility in July: 5mi
The months with the highest visibility are March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are January, February, July and August (5mi).
