Contents
- Weather in April
- Frequently asked questions
- Average temperature in April
- Average pressure in April
- Average wind speed in April
- Average humidity in April
- Average rainfall in April
- Average rainfall days in April
- Average snowfall in April
- Average snowfall days in April
- Average daylight in April
- Average sunshine in April
- Average sunshine days in April
- Average UV index in April
- Average cloud cover in April
- Average visibility in April
Weather in April
Temperature
The arrival of April brings an increase in high-temperatures, moving from a frosty 45.9°F (7.7°C) in March to a mild 57.9°F (14.4°C). An average nighttime temperature of 41.4°F (5.2°C) is witnessed in Rock Falls throughout April.Humidity
The average relative humidity in April is 74%.Rainfall
In Rock Falls, Illinois, during April, the rain falls for 14.8 days and regularly aggregates up to 1.89" (48mm) of precipitation. In Rock Falls, during the entire year, the rain falls for 130.2 days and collects up to 17.36" (441mm) of precipitation.Snowfall
Months with snowfall in Rock Falls are January through April, October through December. April is the last month it regularly snows in Rock Falls. During 1 snowfall days, in April, Rock Falls aggregates 0.31" (8mm) of snow. Throughout the year, there are 34.2 snowfall days, and 7.87" (200mm) of snow is accumulated.Daylight
In Rock Falls, the average length of the day in April is 13h and 22min.On the first day of April in Rock Falls, sunrise is at 6:40 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 5:55 am and sunset at 7:56 pm CDT.
Sunshine
The average sunshine in April is 7.7h.UV index
In Rock Falls, Illinois, the average daily maximum UV index in April is 3. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the average person.Note: In April, a daily maximum UV index of 3 leads to the following instructions:
Stay alert. Light-skinned people could suffer burns in less than 30 minutes. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Frequently asked questions
What are the temperatures in Rock Falls in April?
What is the average humidity in April in Rock Falls?
How many days does it rain in April in Rock Falls?
What is the last month it snows in Rock Falls?
How many hours of daylight does Rock Falls have in April?
When are sunrise and sunset in April in Rock Falls?
How long on average sun shines in April in Rock Falls?
What is the UV index reading in April in Rock Falls?
Average temperature in April
Rock Falls, IL
- Average high temperature in April: 57.9°F
The warmest month (with the highest average high temperature) is July (80.2°F).
The month with the lowest average high temperature is January (27.7°F).
- Average low temperature in April: 41.4°F
The month with the highest average low temperature is July (63.9°F).
The coldest month (with the lowest average low temperature) is January (14.9°F).
Average pressure in April
Rock Falls, IL
- Average pressure in April: 29.94"Hg
The month with the highest atmospheric pressure is January (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in April
Rock Falls, IL
- Average wind speed in April: 10.4mph
The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is August (6.4mph).
Average humidity in April
Rock Falls, IL
- Average humidity in April: 74%
The months with the highest relative humidity are January and July (85%).
The month with the lowest relative humidity is October (73%).
Average rainfall in April
Rock Falls, IL
- Average rainfall in April: 1.89"
The wettest month (with the highest rainfall) is May (2.83").
The driest months (with the least rainfall) are January and February (0.75").
Average rainfall days in April
Rock Falls, IL
- Average rainfall days in April: 14.8 days
The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (4.8 days).
Average snowfall in April
Rock Falls, IL
- Average snowfall in April: 0.31"
The month with the highest snowfall is January (2.56").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Rock Falls, IL
- Average snowfall days in April: 1 days
The month with the highest number of snowfall days is January (10.2 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Rock Falls, IL
- Average daylight in April: 13h and 2min
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 April: 7h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 48min).
Average sunshine days in April
Rock Falls, IL
- Average sunshine days in April: 13.1 days
The months with the most sunshine days are November and December (18.8 days).
The month with the least sunshine days is June (11.3 days).
Average UV index in April
Rock Falls, IL
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is December (UV index 1).
Average cloud cover in April
Rock Falls, IL
- Average cloud cover in April: 48
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 31).
Average visibility in April
Rock Falls, IL
- Average visibility in April: 6mi
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).
Rock Falls, Illinois, USA
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