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
Castleton sees a rise in temperature during April, with average high-temperatures transitioning from a frosty 48.2°F (9°C) in March to a moderate 59.7°F (15.4°C). April's nights observe an average temperature of 43.3°F (6.3°C).Humidity
The average relative humidity in April is 75%.Rainfall
In Castleton, Illinois, during April, the rain falls for 13.6 days and regularly aggregates up to 1.65" (42mm) of precipitation. Throughout the year, in Castleton, there are 116.8 rainfall days, and 13.98" (355mm) of precipitation is accumulated.Snowfall
January through April, October through December are months with snowfall. April is the last month it regularly snows in Castleton. During 0.7 snowfall days, in April, Castleton aggregates 0.91" (23mm) of snow. Throughout the year, in Castleton, Illinois, there are 26.8 snowfall days, and 6.26" (159mm) of snow is accumulated.Daylight
The average length of the day in April in Castleton, Illinois, is 13h and 20min.On the first day of April in Castleton, sunrise is at 6:40 am and sunset at 7:24 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 7:55 pm CDT.
Sunshine
In April, the average sunshine in Castleton, Illinois, is 7.9h.UV index
In Castleton, Illinois, the average daily maximum UV index in April is 3. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: The UV index of 3 during April translates into the following guidance:
Take heed. Individuals of lighter complexion can be burned in less than half an hour. Considering the strength of solar radiation at midday, one should avoid direct Sun exposure. Sunglasses that guard against UVA and UVB rays are pivotal in minimizing sun-induced ocular damage. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average April temperature in Castleton?
What is the average humidity in April in Castleton?
How much does it rain in Castleton in April?
What is the last month it snows in Castleton?
What is the average length of the day in April in Castleton?
When are sunrise and sunset in April in Castleton?
How long on average sun shines in April in Castleton?
How high is the UV index in April in Castleton?
Average temperature in April
Castleton, IL
- Average high temperature in April: 59.7°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 (29.7°F).
- Average low temperature in April: 43.3°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (17.8°F).
Average pressure in April
Castleton, IL
- Average pressure in April: 29.94"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in April
Castleton, IL
- Average wind speed in April: 10.7mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in April
Castleton, IL
- Average humidity in April: 75%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in April
Castleton, IL
- Average rainfall in April: 1.65"
The wettest month (with the highest rainfall) is May (2.24").
The driest month (with the least rainfall) is January (0.59").
Average rainfall days in April
Castleton, IL
- Average rainfall days in April: 13.6 days
The month with the highest number of rainy days is May (15.2 days).
The months with the least rainy days are January and February (4.2 days).
Average snowfall in April
Castleton, IL
- Average snowfall in April: 0.91"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Castleton, IL
- Average snowfall days in April: 0.7 days
The month with the highest number of snowfall days is January (8.6 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
Castleton, IL
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in April: 7h and 5min
The months with the most sunshine are June and July (Average sunshine: 10h and 0min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in April
Castleton, IL
- Average sunshine days in April: 15.2 days
The month with the most sunshine days is November (21.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in April
Castleton, 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
Castleton, IL
- Average cloud cover in April: 46
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in April
Castleton, 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).
Castleton, Illinois, USA
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