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
Sullivan's temperatures tend to reach their peak averages in July, with a high of 82.2°F (27.9°C) and a low of 65.8°F (18.8°C).Heat index
In July, the average heat index is evaluated at a hot 89.6°F (32°C). One might feel worn out with persistent exposure and activity, resulting in heat cramps.Heat index data is primarily for areas with shade and subjected to light winds. A direct sunlight exposure may boost the heat index by 15 Fahrenheit (8 Celsius) degrees.
Note: The heat index, also known as 'feels like' or 'apparent temperature', marries air temperature and humidity to produce a value illustrating perceived warmth. The impact of weather on an individual can be subjective, affected by the person's activity and heat perception, which can vary due to elements including wind, clothing, and metabolic differences. Taking into account that direct sunlight can boost the heat effect, the heat index may rise by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Young ones often disregard the necessity to rest and hydrate. Thirst usually indicates advanced dehydration - hence, it is key to stay hydrated, particularly during ongoing physical activities.
Humidity
July is the most humid month in Sullivan, with an average relative humidity of 84%.Rainfall
In Sullivan, in July, during 14.9 rainfall days, 1.65" (42mm) of precipitation is typically accumulated. Throughout the year, in Sullivan, there are 130.9 rainfall days, and 15.43" (392mm) of precipitation is accumulated.Snowfall
In Sullivan, Illinois, snow does not fall in May through October.Daylight
In July, the average length of the day is 14h and 38min.On the first day of July in Sullivan, sunrise is at 5:31 am and sunset at 8:25 pm. On the last day of the month, sunrise is at 5:53 am and sunset at 8:07 pm CDT.
Sunshine
In Sullivan, the average sunshine in July is 10.1h.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index in Sullivan. A UV Index estimate of 6 to 7 represents a high health hazard from exposure to the Sun's UV rays for ordinary individuals.Note: The maximum UV index of 6 during July translates into these guidelines:
Incorporate safeguards and honour sun safety principles. Protection from skin and eye damage is obligatory. The Sun's UV radiation is most powerful between 10 a.m. and 4 p.m. To the extent possible, limit exposure to the direct sun during these hours. On sunny days, it's ideal to wear sunglasses that filter out UVA and UVB rays.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What part of the year is the hottest in Sullivan?
What is the temperature in July in Sullivan?
What is the most humid month in Sullivan?
What is the average humidity in July in Sullivan?
How many days does it rain in July in Sullivan?
When it does not snow in Sullivan?
What is the average length of the day in July in Sullivan?
When are sunrise and sunset in July in Sullivan?
How long on average sun shines in July in Sullivan?
When is the highest UV index in Sullivan?
What is the UV index reading in July in Sullivan?
Average temperature in July
Sullivan, IL
- Average high temperature in July: 82.2°F
The warmest month (with the highest average high temperature) is July (82.2°F).
The month with the lowest average high temperature is January (33.6°F).
- Average low temperature in July: 65.8°F
The month with the highest average low temperature is July (65.8°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in July
Sullivan, IL
- Average pressure in July: 29.97"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in July
Sullivan, IL
- Average wind speed in July: 6.3mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in July
Sullivan, IL
- Average humidity in July: 84%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in July
Sullivan, IL
- Average rainfall in July: 1.65"
The wettest month (with the highest rainfall) is June (1.85").
The driest month (with the least rainfall) is February (0.71").
Average rainfall days in July
Sullivan, IL
- Average rainfall days in July: 14.9 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is February (5.9 days).
Average snowfall in July
Sullivan, IL
- Average snowfall in July: 0"
The month with the highest snowfall is January (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in July
Sullivan, IL
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (6.4 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
Sullivan, IL
- Average daylight in July: 14h and 4min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in July: 10h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in July
Sullivan, IL
- Average sunshine days in July: 12.6 days
The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in July
Sullivan, IL
- Average UV index in July: 6
The months with the highest UV index are 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 July
Sullivan, IL
- Average cloud cover in July: 31
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is June (Cloud cover 30).
Average visibility in July
Sullivan, IL
- Average visibility in July: 5mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Sullivan, Illinois, USA
Weather forecast for your location
2. Allow the app to use your location