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 transition from March to April brings a temperature rise, with average high-temperatures increasing from a fresh 53.1°F (11.7°C) to a comfortable 64.2°F (17.9°C). The average temperature in Olney during April nights dips to a frosty 47.7°F (8.7°C).Humidity
The average relative humidity in April in Olney is 77%.Rainfall
April is the month with the most rainfall in Olney. Rain falls for 15.1 days and accumulates 4.09" (104mm) of precipitation.Snowfall
Months with snowfall in Olney are January through April, November and December. April is the last month it regularly snows. During 0.3 snowfall days, in April, Olney aggregates 0.12" (3mm) of snow. Throughout the year, there are 20.3 snowfall days, and 5.47" (139mm) of snow is accumulated.Daylight
In Olney, Illinois, the average length of the day in April is 13h and 14min.On the first day of April, sunrise is at 6:35 am and sunset at 7:16 pm. On the last day of the month, sunrise is at 5:54 am and sunset at 7:44 pm CDT.
Sunshine
In Olney, Illinois, the average sunshine in April is 8.4h.UV index
In April, the average daily maximum UV index in Olney is 4. A UV Index reading of 3 to 5 represents a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: The UV index of 4 in April translates into these instructions:
Undertake protective steps - Obligation to safeguard skin and eyes from harm is in place. Avoiding the Sun's peak radiation during midday hours is essential for health and safety. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Guard yourself! Snow reflection can almost double the UV radiation from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures in Olney?
What is the average humidity in April in Olney?
What is the rainiest month in Olney?
How much does it rain in Olney in April?
What is the last month it snows in Olney?
What is the average length of the day in April in Olney?
What time are sunrise and sunset in April in Olney?
How long on average sun shines in April in Olney?
What is the UV index reading in April in Olney?
Average temperature in April
Olney, IL
- Average high temperature in April: 64.2°F
The warmest month (with the highest average high temperature) is July (84.2°F).
The month with the lowest average high temperature is January (36.7°F).
- Average low temperature in April: 47.7°F
The month with the highest average low temperature is July (67.5°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in April
Olney, IL
- Average pressure in April: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in April
Olney, IL
- Average wind speed in April: 9.9mph
The windiest months (with the highest average wind speed) are January and February (10.2mph).
The calmest month (with the lowest average wind speed) is July (5.9mph).
Average humidity in April
Olney, IL
- Average humidity in April: 77%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (70%).
Average rainfall in April
Olney, IL
- Average rainfall in April: 4.09"
The wettest month (with the highest rainfall) is April (4.09").
The driest month (with the least rainfall) is September (1.54").
Average rainfall days in April
Olney, IL
- Average rainfall days in April: 15.1 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is January (8.8 days).
Average snowfall in April
Olney, IL
- Average snowfall in April: 0.12"
The month with the highest snowfall is January (1.54").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Olney, IL
- Average snowfall days in April: 0.3 days
The month with the highest number of snowfall days is January (5.9 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
Olney, IL
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in April: 8h and 2min
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 24min).
Average sunshine days in April
Olney, IL
- Average sunshine days in April: 12.6 days
The month with the most sunshine days is October (18.8 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in April
Olney, 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, November and December (UV index 2).
Average cloud cover in April
Olney, IL
- Average cloud cover in April: 42
The month with the most cloud cover is January (Cloud cover 52).
The months with the least cloud cover are June and August (Cloud cover 28).
Average visibility in April
Olney, 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).
Olney, Illinois, USA
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