April weather forecastDecatur, IL
April
Weather in April
April in Decatur, Illinois unfurls the spring season in its entirety, with the city's inhabitants finally stowing away the shackles of winter. Infrequent rainfall of 1.93" (49mm) and a growing total of 13.3 daylight hours ensure a pleasant spring, enabling outdoor activities without the weight of winter. The city experiences an elevation in humidity levels, adding a bit more moisture to the air. This month maintains a steady build-up towards the rising temperatures of summer. Lushening green, chirping birds, and an extended sunset underline April's serenade to spring.Temperature
April's arrival in Decatur brings a change in high-temperatures, moving from a cool 50.5°F (10.3°C) in March to a comfortable 61.9°F (16.6°C). Decatur, in April, experiences an average temperature of 46°F (7.8°C) at night.Humidity
In April, the average relative humidity is 74%.Rainfall
In Decatur, in April, it is raining for 13.6 days, with typically 1.93" (49mm) of accumulated precipitation. Throughout the year, in Decatur, there are 130.2 rainfall days, and 16.34" (415mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. April is the last month it regularly snows in Decatur. During 0.5 snowfall days, in April, Decatur aggregates 0.04" (1mm) of snow. In Decatur, during the entire year, snow falls for 23.1 days and aggregates up to 5.67" (144mm) of snow.Daylight
In Decatur, the average length of the day in April is 13h and 17min.On the first day of April, sunrise is at 6:38 am and sunset at 7:20 pm. On the last day of the month, sunrise is at 5:56 am and sunset at 7:49 pm CDT.
Sunshine
The average sunshine in April in Decatur is 8.2h.UV index
The average daily maximum UV index in April is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from unsafe exposure to UV radiation for average individuals.Note: A daily maximum UV index of 4 in April translates into the following instructions:
Undertake precautions - Guarding against sun damage is counselled. The Sun is most powerful around mid-day, so it's a good practice to reduce direct exposure. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Remember! The Sun's UV radiation can be magnified almost twofold by the reflection of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Decatur, IL
- Average high temperature in April: 61.9°F
The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (32.9°F).
- Average low temperature in April: 46°F
The month with the highest average low temperature is July (65.7°F).
The coldest month (with the lowest average low temperature) is January (21.2°F).
Average pressure in April
Decatur, IL
- Average pressure in April: 29.94"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).
Average wind speed in April
Decatur, IL
- Average wind speed in April: 10.6mph
The windiest month (with the highest average wind speed) is January (10.7mph).
The calmest months (with the lowest average wind speed) are July and August (6.3mph).
Average humidity in April
Decatur, IL
- Average humidity in April: 74%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (70%).
Average rainfall in April
Decatur, IL
- Average rainfall in April: 1.93"
The wettest month (with the highest rainfall) is May (2.01").
The driest months (with the least rainfall) are February and December (0.87").
Average rainfall days in April
Decatur, IL
- Average rainfall days in April: 13.6 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is February (5.8 days).
Average snowfall in April
Decatur, IL
- Average snowfall in April: 0.04"
The month with the highest snowfall is January (1.85").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Decatur, IL
- Average snowfall days in April: 0.5 days
The month with the highest number of snowfall days is January (7.2 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
Decatur, IL
- Average daylight in April: 13h and 18min
The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).
- Average sunshine in April: 8h and 12min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in April
Decatur, IL
- Average sunshine days in April: 14.5 days
The month with the most sunshine days is October (19.8 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in April
Decatur, 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
Decatur, IL
- Average cloud cover in April: 44
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in April
Decatur, 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).
