April weather forecastMount Vernon, IL
April
Weather in April
April is a refreshing spring month in Mount Vernon, Illinois, with an average temperature varying between 47.8°F (8.8°C) and 65.1°F (18.4°C).Temperature
The onset of April brings a temperature shift, with the average high-temperature moving from a cool 54.3°F (12.4°C) in March to an enjoyable 65.1°F (18.4°C). April witnesses an average low-temperature hovering around a frosty 47.8°F (8.8°C).Humidity
In Mount Vernon, the average relative humidity in April is 77%.Rainfall
The month with the most rainfall in Mount Vernon is April, when the rain falls for 14.7 days and typically aggregates up to 3.78" (96mm) of precipitation.Snowfall
Months with snowfall in Mount Vernon are January through April, November and December. April is the last month it regularly snows. During 0.3 snowfall days, in April, Mount Vernon aggregates 0.04" (1mm) of snow. Throughout the year, there are 15.4 snowfall days, and 5.87" (149mm) of snow is accumulated.Daylight
In April, the average length of the day is 13h and 13min.On the first day of the month, sunrise is at 6:39 am and sunset at 7:19 pm. On the last day of April, in Mount Vernon, sunrise is at 5:58 am and sunset at 7:46 pm CDT.
Sunshine
The average sunshine in April is 8.5h.UV index
In Mount Vernon, the average daily maximum UV index in April is 4. A UV Index estimate of 3 to 5 represents a moderate threat to health from unsafe exposure to UV radiation for ordinary individuals.Note: A daily maximum UV index of 4 in April translates into the following instructions:
Guard yourself - Precautionary measures against sun damage are advocated. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Mind this! Nearly twice the UV radiation from the Sun can be reflected by the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in April
Mount Vernon, IL
- Average high temperature in April: 65.1°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in April: 47.8°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in April
Mount Vernon, 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
Mount Vernon, IL
- Average wind speed in April: 9.6mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in April
Mount Vernon, IL
- Average humidity in April: 77%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Mount Vernon, IL
- Average rainfall in April: 3.78"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in April
Mount Vernon, IL
- Average rainfall days in April: 14.7 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in April
Mount Vernon, IL
- Average snowfall in April: 0.04"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Mount Vernon, IL
- Average snowfall days in April: 0.3 days
The month with the highest number of snowfall days is January (4.8 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
Mount Vernon, IL
- Average daylight in April: 13h and 12min
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 36min).
- Average sunshine in April: 8h and 30min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in April
Mount Vernon, IL
- Average sunshine days in April: 13.7 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in April
Mount Vernon, 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, November and December (UV index 2).
Average cloud cover in April
Mount Vernon, IL
- Average cloud cover in April: 42
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in April
Mount Vernon, 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).
