April weather forecastHarrisburg, IL
April
Weather in April
April in Harrisburg, Illinois promises the full blush of Spring, with a significant rise in temperatures from 48.7°F (9.3°C) to 66.4°F (19.1°C). Spring blooms find their peak this month, offering a delightful show of colors and fragrances all through the city. April also brings the most amount of rainfall for the year, leading to a burst of lush greenery. Longer daylight hours allow adequate time to immerse in outdoor activities and relish the positive weather. As April wraps up, it leaves behind an anticipation of the approaching Summer season.Temperature
With the transition into April, Harrisburg experiences an increase in average high-temperatures, moving up from a fresh 55°F (12.8°C) in March to a refreshing 66.4°F (19.1°C). Throughout the month of April, the nighttime temperature dips to an average of 48.7°F (9.3°C).Humidity
In Harrisburg, the average relative humidity in April is 77%.Rainfall
April is the month with the most rainfall. Rain falls for 16.6 days and accumulates 4.8" (122mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. April is the last month it regularly snows. During 0.6 snowfall days, in April, Harrisburg aggregates 0.16" (4mm) of snow. Throughout the year, in Harrisburg, there are 17.7 snowfall days, and 6.57" (167mm) of snow is accumulated.Daylight
In Harrisburg, the average length of the day in April is 13h and 12min.On the first day of the month, sunrise is at 6:38 am and sunset at 7:17 pm. On the last day of April, sunrise is at 5:58 am and sunset at 7:44 pm CDT.
Sunshine
The average sunshine in April is 8.6h.UV index
The average daily maximum UV index in April is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from exposure to the Sun's UV radiation for the average person.Note: The average daily UV index of 4 in April transforms into the following instructions:
Ensure safety - Recommendations to avert sunburn are presented. The best time to avoid the Sun's harmful UV radiation is during midday when it's most potent. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Harrisburg, IL
- Average high temperature in April: 66.4°F
The warmest month (with the highest average high temperature) is July (87.3°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in April: 48.7°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.2°F).
Average pressure in April
Harrisburg, IL
- Average pressure in April: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in April
Harrisburg, IL
- Average wind speed in April: 9.3mph
The windiest months (with the highest average wind speed) are January and February (9.4mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).
Average humidity in April
Harrisburg, IL
- Average humidity in April: 77%
The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (70%).
Average rainfall in April
Harrisburg, IL
- Average rainfall in April: 4.8"
The wettest month (with the highest rainfall) is April (4.8").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in April
Harrisburg, IL
- Average rainfall days in April: 16.6 days
The month with the highest number of rainy days is May (18.5 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in April
Harrisburg, IL
- Average snowfall in April: 0.16"
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
Harrisburg, IL
- Average snowfall days in April: 0.6 days
The month with the highest number of snowfall days is January (5.3 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
Harrisburg, IL
- Average daylight in April: 13h and 12min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in April: 8h and 36min
The month with the most sunshine is June (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in April
Harrisburg, IL
- Average sunshine days in April: 11.5 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (9.9 days).
Average UV index in April
Harrisburg, IL
- Average UV index in April: 4
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February and December (UV index 2).
Average cloud cover in April
Harrisburg, IL
- Average cloud cover in April: 41
The months with the most cloud cover are January and February (Cloud cover 51).
The months with the least cloud cover are June and September (Cloud cover 28).
Average visibility in April
Harrisburg, 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).
