April weather forecastFlat Rock, IL
April
Weather in April
April in Flat Rock, Illinois, is a comfortable spring month, with an average temperature ranging between min 46.9°F (8.3°C) and max 64°F (17.8°C).Temperature
Flat Rock's weather in April shows a rise in the average high-temperature, moving up from March's cool 53.1°F (11.7°C) to an enjoyable 64°F (17.8°C). Throughout April, the average low-temperature dips to a chilly 46.9°F (8.3°C).Humidity
In Flat Rock, the average relative humidity in April is 77%.Rainfall
The month with the most rainfall is April, when the rain falls for 15.8 days and typically aggregates up to 5.2" (132mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows. During 0.3 snowfall days, in April, Flat Rock aggregates 0.16" (4mm) of snow. Throughout the year, there are 22 snowfall days, and 7.64" (194mm) of snow is accumulated.Daylight
In Flat Rock, the average length of the day in April is 13h and 15min.On the first day of the month, sunrise is at 6:33 am and sunset at 7:14 pm. On the last day of April, sunrise is at 5:52 am and sunset at 7:42 pm CDT.
Sunshine
In Flat Rock, the average sunshine in April is 8h.UV index
In April, the average daily maximum UV index in Flat Rock is 4. A UV Index estimate of 3 to 5 represents a moderate health risk from exposure to the Sun's UV rays for the average person.Note: The maximum daily UV index of 4 during April translates into the following directions:
Guard yourself - Avoiding sunburn is suggested. To protect against the Sun's most potent rays, avoid direct exposure around midday. Boost your sun resistance with garments that are densely woven yet spacious. Stay alert! Snow's reflective properties can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Flat Rock, IL
- Average high temperature in April: 64°F
The warmest month (with the highest average high temperature) is July (83.8°F).
The month with the lowest average high temperature is January (36.1°F).
- Average low temperature in April: 46.9°F
The month with the highest average low temperature is July (66.9°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in April
Flat Rock, IL
- Average pressure in April: 29.95"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 April
Flat Rock, IL
- Average wind speed in April: 9.8mph
The windiest months (with the highest average wind speed) are January and February (10mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in April
Flat Rock, IL
- Average humidity in April: 77%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Flat Rock, IL
- Average rainfall in April: 5.2"
The wettest month (with the highest rainfall) is April (5.2").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in April
Flat Rock, IL
- Average rainfall days in April: 15.8 days
The month with the highest number of rainy days is May (19.8 days).
The month with the least rainy days is January (8.4 days).
Average snowfall in April
Flat Rock, IL
- Average snowfall in April: 0.16"
The month with the highest snowfall is January (2.32").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Flat Rock, IL
- Average snowfall days in April: 0.3 days
The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in April /
Average sunshine in April
Flat Rock, IL
- Average daylight in April: 13h and 12min
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 April: 8h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).
Average sunshine days in April
Flat Rock, IL
- Average sunshine days in April: 12 days
The month with the most sunshine days is November (18 days).
The month with the least sunshine days is May (9.7 days).
Average UV index in April
Flat Rock, IL
- Average UV index in April: 4
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 April
Flat Rock, IL
- Average cloud cover in April: 44
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in April
Flat Rock, IL
- Average visibility in April: 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).
