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
Alton's temperature records reveal July as the warmest month, marked by average highs of 85.3°F (29.6°C) and lows of 67.6°F (19.8°C).Heat index
For July, the heat index is appraised at a fiery hot 96.8°F (36°C). Exercise increased caution, heat cramps and heat exhaustion are potential hazards. Continuous activity could lead to heatstroke.Be informed that the heat index values are oriented around shady conditions and gentle breezes. Direct sunlight exposure may cause a 15 Fahrenheit (8 Celsius) degrees rise in the heat index.
Note: The heat index, also known as 'apparent temperature' or 'feels like', melds the effects of warmth and moisture to generate a feeling of heat. 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. Direct sunlight can potentially raise the heat index by 15 Fahrenheit (8 Celsius) degrees, so it's crucial to consider. Heat index values are extremely significant for babies and toddlers. Younglings are generally more in peril than adults due to their reduced perspiration. Coupled with a larger skin surface relative to their tiny bodies and greater heat production because of their activity, they become more at risk.
The body's self-cooling mechanism is rooted in perspiration, where evaporating sweat cools down excessive warmth. An elevated level of relative humidity hinders evaporation, leading to decreased heat elimination from the body, inducing a sensation of excess heat. Accumulating heat beyond the body's cooling measures leads to rising temperatures and potential ailments.
Humidity
July is the most humid month in Alton, with an average relative humidity of 80%.Rainfall
In July, in Alton, the rain falls for 15.4 days. Throughout July, 2.05" (52mm) of precipitation is accumulated. Throughout the year, in Alton, there are 128.3 rainfall days, and 18.9" (480mm) of precipitation is accumulated.Snowfall
April through October are months without snowfall.Daylight
In Alton, the average length of the day in July is 14h and 35min.On the first day of July in Alton, Illinois, sunrise is at 5:39 am and sunset at 8:30 pm. On the last day of the month, sunrise is at 6:01 am and sunset at 8:12 pm CDT.
Sunshine
In July, the average sunshine in Alton is 10.3h.UV index
June through August, with an average maximum UV index of 6, are months with the highest UV index in Alton. A UV Index of 6 to 7 symbolizes a high health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The maximum UV index of 6 during July translates into these guidelines:
Deter overexposure. Protecting against the sun's effects is essential. The Sun's UV radiation is most potent between the hours of 10 a.m. and 4 p.m. Try to avoid direct sunlight during this time. Fend off the sun's harsh rays with appropriate clothing, a wide-brim hat, and UV-protective sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What month is the hottest in Alton?
How hot is July in Alton?
What is the most humid month in Alton?
What is the average humidity in July in Alton?
How much does it rain in Alton in July?
When it does not snow in Alton?
How many hours of daylight does Alton have in July?
What time are sunrise and sunset in July in Alton?
How long on average sun shines in July in Alton?
What are the months with the highest UV index in Alton?
What is the UV index intensity in July in Alton?
Average temperature in July
Alton, IL
- Average high temperature in July: 85.3°F
The warmest month (with the highest average high temperature) is July (85.3°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in July: 67.6°F
The month with the highest average low temperature is July (67.6°F).
The coldest month (with the lowest average low temperature) is January (23.2°F).
Average pressure in July
Alton, IL
- Average pressure in July: 29.97"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in July
Alton, IL
- Average wind speed in July: 5.7mph
The windiest month (with the highest average wind speed) is January (9.6mph).
The calmest month (with the lowest average wind speed) is July (5.7mph).
Average humidity in July
Alton, IL
- Average humidity in July: 80%
The month with the highest relative humidity is July (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in July
Alton, IL
- Average rainfall in July: 2.05"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.83").
Average rainfall days in July
Alton, IL
- Average rainfall days in July: 15.4 days
The month with the highest number of rainy days is July (15.4 days).
The month with the least rainy days is January (5.7 days).
Average snowfall in July
Alton, IL
- Average snowfall in July: 0"
The month with the highest snowfall is February (1.14").
The months with the least snowfall are April, May, June, July, August, September and October (0").
Average snowfall days in July
Alton, IL
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (5.4 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
Alton, 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 30min).
- Average sunshine in July: 10h and 2min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The months with the least sunshine are January and February (Average sunshine: 4h and 30min).
Average sunshine days in July
Alton, IL
- Average sunshine days in July: 13.3 days
The month with the most sunshine days is December (21 days).
The month with the least sunshine days is June (12.6 days).
Average UV index in July
Alton, 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
Alton, IL
- Average cloud cover in July: 29
The month with the most cloud cover is January (Cloud cover 52).
The month with the least cloud cover is August (Cloud cover 28).
Average visibility in July
Alton, 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).
Alton, Illinois, USA
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