August weather forecastCrystal Lake, IL
August
Weather in August
The last month of the summer, August, is another warm month in Crystal Lake, Illinois, with an average temperature ranging between min 61.9°F (16.6°C) and max 78.1°F (25.6°C).Temperature
The beginning of August records an average high-temperature of a still moderately hot 78.1°F (25.6°C), marking a negligible difference from July's 79.5°F (26.4°C). August generally records an average low-temperature of 61.9°F (16.6°C).Humidity
In Crystal Lake, the average relative humidity in August is 82%.Rainfall
In August, the rain falls for 17.3 days. Throughout August, 2.52" (64mm) of precipitation is accumulated. Throughout the year, in Crystal Lake, there are 146.9 rainfall days, and 21.22" (539mm) of precipitation is accumulated.Snowfall
June through September are months without snowfall.Daylight
In August, the average length of the day is 13h and 50min.On the first day of August, sunrise is at 5:46 am and sunset at 8:12 pm. On the last day of the month, sunrise is at 6:18 am and sunset at 7:28 pm CDT.
Sunshine
In Crystal Lake, the average sunshine in August is 9.8h.UV index
With an average maximum UV index of 6, August is the month with the highest UV index. 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: A maximum high UV index of 6 in August translates into the following recommendations:
Uphold preventive measures and conform to sun safety guidelines. Defending against skin and eye harm is crucial. The Sun's UV radiation is most potent between 10 a.m. and 4 p.m. Try to limit direct exposure to the Sun during this period. Shield yourself from the harmful effects of UV radiation with sun-protective attire, a hat, and quality sunglasses.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in August
Crystal Lake, IL
- Average high temperature in August: 78.1°F
The warmest month (with the highest average high temperature) is July (79.5°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in August: 61.9°F
The month with the highest average low temperature is July (63.1°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in August
Crystal Lake, IL
- Average pressure in August: 29.98"Hg
The month with the highest atmospheric pressure is January (30.11"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in August
Crystal Lake, IL
- Average wind speed in August: 6.2mph
The windiest months (with the highest average wind speed) are January and February (9.9mph).
The calmest month (with the lowest average wind speed) is August (6.2mph).
Average humidity in August
Crystal Lake, IL
- Average humidity in August: 82%
The months with the highest relative humidity are January and February (85%).
The months with the lowest relative humidity are April and October (76%).
Average rainfall in August
Crystal Lake, IL
- Average rainfall in August: 2.52"
The wettest month (with the highest rainfall) is June (2.8").
The driest months (with the least rainfall) are November and December (0.94").
Average rainfall days in August
Crystal Lake, IL
- Average rainfall days in August: 17.3 days
The month with the highest number of rainy days is July (18.5 days).
The month with the least rainy days is February (4.8 days).
Average snowfall in August
Crystal Lake, IL
- Average snowfall in August: 0"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in August
Crystal Lake, IL
- Average snowfall days in August: 0 days
The month with the highest number of snowfall days is January (12.5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in August /
Average sunshine in August
Crystal Lake, IL
- Average daylight in August: 13h and 48min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in August: 9h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 42min).
Average sunshine days in August
Crystal Lake, IL
- Average sunshine days in August: 10.4 days
The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is July (10 days).
Average UV index in August
Crystal Lake, IL
- Average UV index in August: 6
The month with the highest UV index is August (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in August
Crystal Lake, IL
- Average cloud cover in August: 33
The month with the most cloud cover is January (Cloud cover 62).
The months with the least cloud cover are July and September (Cloud cover 32).
Average visibility in August
Crystal Lake, IL
- Average visibility in August: 5mi
The months with the highest visibility are March, April, May, June, July, September, October, November and December (6mi).
The months with the lowest visibility are January, February and August (5mi).
