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
Knoxville's transition into April sees a rise in the average high-temperature, advancing from a chilly 47.8°F (8.8°C) in March to a refreshing 59.9°F (15.5°C). During April, the nighttime temperature averages to a cold 42.4°F (5.8°C).Humidity
The average relative humidity in April in Knoxville is 74%.Rainfall
In Knoxville, during April, the rain falls for 11.8 days and regularly aggregates up to 1.14" (29mm) of precipitation. Throughout the year, in Knoxville, there are 115.3 rainfall days, and 13.31" (338mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall in Knoxville. In Knoxville, during April, snow falls for 1.1 days and regularly aggregates up to 0.59" (15mm) of snow. In Knoxville, during the entire year, snow falls for 30.4 days and aggregates up to 6.5" (165mm) of snow.Daylight
The average length of the day in April is 13h and 21min.On the first day of April in Knoxville, Iowa, sunrise is at 6:54 am and sunset at 7:38 pm. On the last day of the month, sunrise is at 6:09 am and sunset at 8:09 pm CDT.
Sunshine
In April, the average sunshine in Knoxville is 8.2h.UV index
In April, the average daily maximum UV index is 4. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The maximum UV index, 4 during April, leads to the following recommendations:
Guard yourself - An obligation to protect skin and eyes from harm exists. Considering the Sun's intensity during midday, it's wise to minimize direct exposure. For effective sun eye protection, rely on sunglasses certified for UVA and UVB resistance. Be alert to the fact! The reflection from snow can nearly double the UV radiation of the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Knoxville in April?
What is the average humidity in April in Knoxville?
How many days does it rain in April in Knoxville?
How much does it snow in Knoxville in April?
What is the average length of the day in April in Knoxville?
When is the sunrise / sunset in April in Knoxville?
How many hours of sunshine does Knoxville have in April?
What is the UV index intensity in April in Knoxville?
Average temperature in April
Knoxville, IA
- Average high temperature in April: 59.9°F
The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (28.6°F).
- Average low temperature in April: 42.4°F
The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (15.1°F).
Average pressure in April
Knoxville, IA
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in April
Knoxville, IA
- Average wind speed in April: 10.4mph
The windiest month (with the highest average wind speed) is January (10.5mph).
The calmest month (with the lowest average wind speed) is August (6.8mph).
Average humidity in April
Knoxville, IA
- Average humidity in April: 74%
The month with the highest relative humidity is January (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Knoxville, IA
- Average rainfall in April: 1.14"
The wettest month (with the highest rainfall) is May (2.24").
The driest months (with the least rainfall) are February and December (0.47").
Average rainfall days in April
Knoxville, IA
- Average rainfall days in April: 11.8 days
The month with the highest number of rainy days is May (15.3 days).
The month with the least rainy days is February (3.9 days).
Average snowfall in April
Knoxville, IA
- Average snowfall in April: 0.59"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Knoxville, IA
- Average snowfall days in April: 1.1 days
The month with the highest number of snowfall days is January (8.7 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Knoxville, IA
- 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: 8h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in April
Knoxville, IA
- Average sunshine days in April: 14.9 days
The months with the most sunshine days are November and December (20.5 days).
The month with the least sunshine days is June (11.6 days).
Average UV index in April
Knoxville, IA
- Average UV index in April: 4
The months with the highest UV index are June, July and August (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in April
Knoxville, IA
- Average cloud cover in April: 44
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are July, August and September (Cloud cover 29).
Average visibility in April
Knoxville, IA
- 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).
Knoxville, Iowa, USA
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