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
Boulder Hill's transition into April is marked by a rise in the average high-temperature, advancing from a chilly 45.7°F (7.6°C) in March to a mild 57°F (13.9°C). April's average low-temperature reading in Boulder Hill, Illinois, settles at a wintry 40.8°F (4.9°C).Humidity
In April, the average relative humidity is 75%.Rainfall
In Boulder Hill, in April, it is raining for 14.4 days, with typically 1.77" (45mm) of accumulated precipitation. Throughout the year, there are 133.1 rainfall days, and 16.93" (430mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, October through December. April is the last month it regularly snows. During 1.8 snowfall days, in April, Boulder Hill aggregates 1.18" (30mm) of snow. Throughout the year, there are 39.5 snowfall days, and 6.69" (170mm) of snow is accumulated.Daylight
In Boulder Hill, the average length of the day in April is 13h and 22min.On the first day of April, sunrise is at 6:34 am and sunset at 7:19 pm. On the last day of the month, sunrise is at 5:50 am and sunset at 7:50 pm CDT.
Sunshine
The average sunshine in April is 7.7h.UV index
The average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a medium health hazard from unsafe exposure to UV radiation for the average person.Note: The UV index of 3 in April translates into these instructions:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. To cut down UV radiation exposure by about half, sport a wide-brim hat. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures in Boulder Hill?
What is the average humidity in April in Boulder Hill?
How many days does it rain in April in Boulder Hill?
What is the last month it snows in Boulder Hill?
How many hours of daylight does Boulder Hill have in April?
When is the sunrise / sunset in April in Boulder Hill?
How long on average sun shines in April in Boulder Hill?
How high is the UV index in April in Boulder Hill?
Average temperature in April
Boulder Hill, IL
- Average high temperature in April: 57°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (28.4°F).
- Average low temperature in April: 40.8°F
The month with the highest average low temperature is July (64.2°F).
The coldest month (with the lowest average low temperature) is January (16.7°F).
Average pressure in April
Boulder Hill, IL
- Average pressure in April: 29.95"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 April
Boulder Hill, IL
- Average wind speed in April: 9.7mph
The windiest month (with the highest average wind speed) is April (9.7mph).
The calmest month (with the lowest average wind speed) is August (6mph).
Average humidity in April
Boulder Hill, IL
- Average humidity in April: 75%
The months with the highest relative humidity are January, February, July and August (83%).
The month with the lowest relative humidity is October (74%).
Average rainfall in April
Boulder Hill, IL
- Average rainfall in April: 1.77"
The wettest month (with the highest rainfall) is June (2.24").
The driest months (with the least rainfall) are November and December (0.75").
Average rainfall days in April
Boulder Hill, IL
- Average rainfall days in April: 14.4 days
The month with the highest number of rainy days is July (16.6 days).
The month with the least rainy days is February (4.3 days).
Average snowfall in April
Boulder Hill, IL
- Average snowfall in April: 1.18"
The month with the highest snowfall is January (1.73").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Boulder Hill, IL
- Average snowfall days in April: 1.8 days
The month with the highest number of snowfall days is January (10.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Boulder Hill, 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
Boulder Hill, IL
- Average sunshine days in April: 12.3 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is July (10.2 days).
Average UV index in April
Boulder Hill, IL
- Average UV index in April: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in April
Boulder Hill, IL
- Average cloud cover in April: 49
The month with the most cloud cover is January (Cloud cover 60).
The month with the least cloud cover is September (Cloud cover 32).
Average visibility in April
Boulder Hill, 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).
Boulder Hill, Illinois, USA
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