July weather forecastGriggsville, IL
July
Weather in July
July, the same as June, is a moderately hot summer month in Griggsville, Illinois, with an average temperature fluctuating between 66.7°F (19.3°C) and 84.4°F (29.1°C).Temperature
In Griggsville, the peak temperatures are generally noted in July, averaging a high of 84.4°F (29.1°C) and a low of 66.7°F (19.3°C).Heat index
Throughout July, the heat index is calculated to be a torrid 95°F (35°C). More protective measures are required - heat exhaustion and heat cramps are likely. Heatstroke may follow lengthy activity.Take into consideration that the heat index values are calculated for shade and light wind conditions. Heat index values may rise by up to 15 Fahrenheit (8 Celsius) degrees when exposed to direct sunlight.
Note: The heat index, also known as 'feels like' or 'apparent temperature', is achieved by amalgamating air temperature with the relative humidity readings. An individual's perception of weather can be influenced by a variety of factors including metabolic differences, being pregnant, and their degree of physical exertion. Direct sun rays have a notable impact on perceived temperature, which can raise the heat index by up to 15 Fahrenheit (8 Celsius) degrees. Heat index values are particularly important for children. Typically, young kids are at a higher risk than adults since they sweat less. Also, the larger skin surface in proportion to their small bodies and the heightened heat production due to their active nature adds to their vulnerability.
When it comes to cooling down, the human body's primary method is through perspiration, making use of sweat evaporation to eliminate excess heat. When there is abundant moisture in the air, the body's cooling through the evaporation process becomes less effective, leading to the sensation of overheating. Overheating and potential dehydration arise when body heat gain eclipses its release capability.
Humidity
The months with the highest humidity are June and July, with an average relative humidity of 81%.Rainfall
In July, the rain falls for 13.5 days. Throughout July, 1.69" (43mm) of precipitation is accumulated. In Griggsville, Illinois, during the entire year, the rain falls for 128.8 days and collects up to 18.35" (466mm) of precipitation.Snowfall
In Griggsville, snow does not fall in May through October.Daylight
In July, the average length of the day is 14h and 39min.On the first day of the month, sunrise is at 5:39 am and sunset at 8:34 pm. On the last day of July, sunrise is at 6:01 am and sunset at 8:16 pm CDT.
Sunshine
June and July, with an average of 10.3h of sunshine, are months with the most sunshine.UV index
The months with the highest UV index are June through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In July, the UV index of 6 transforms into the following advice:
Enforce precautions and stick to sun safety measures. Preservation from skin and eye damage is essential. UV radiation from the sun is at its strongest between 10 a.m. and 4 p.m. Try to limit direct exposure during these hours. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in July
Griggsville, IL
- Average high temperature in July: 84.4°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (33.8°F).
- Average low temperature in July: 66.7°F
The month with the highest average low temperature is July (66.7°F).
The coldest month (with the lowest average low temperature) is January (21.6°F).
Average pressure in July
Griggsville, IL
- Average pressure in July: 29.96"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in July
Griggsville, IL
- Average wind speed in July: 6mph
The windiest months (with the highest average wind speed) are January, February and April (9.8mph).
The calmest month (with the lowest average wind speed) is July (6mph).
Average humidity in July
Griggsville, IL
- Average humidity in July: 81%
The months with the highest relative humidity are June and July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in July
Griggsville, IL
- Average rainfall in July: 1.69"
The wettest month (with the highest rainfall) is May (2.44").
The driest month (with the least rainfall) is February (0.75").
Average rainfall days in July
Griggsville, IL
- Average rainfall days in July: 13.5 days
The month with the highest number of rainy days is May (16.8 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in July
Griggsville, IL
- Average snowfall in July: 0"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in July
Griggsville, IL
- Average snowfall days in July: 0 days
The month with the highest number of snowfall days is January (6.3 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
Griggsville, IL
- Average daylight in July: 14h and 42min
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 18min
The months with the most sunshine are June and July (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 24min).
Average sunshine days in July
Griggsville, IL
- Average sunshine days in July: 13.7 days
The month with the most sunshine days is December (20.7 days).
The month with the least sunshine days is June (12.3 days).
Average UV index in July
Griggsville, 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
Griggsville, IL
- Average cloud cover in July: 29
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June, July, August and September (Cloud cover 29).
Average visibility in July
Griggsville, 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).
