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
As Riverdale welcomes April, the average high-temperature sees a rise, transitioning from a chilly 46.8°F (8.2°C) in March to a mild 59°F (15°C). Throughout the nights in April, Riverdale experiences an average low-temperature of 42.4°F (5.8°C).Humidity
In Riverdale, the average relative humidity in April is 74%.Rainfall
In Riverdale, Iowa, during April, the rain falls for 11.8 days and regularly aggregates up to 1.02" (26mm) of precipitation. In Riverdale, during the entire year, the rain falls for 99.4 days and collects up to 9.57" (243mm) of precipitation.Snowfall
Months with snowfall are January through April, September through December. April is the last month it regularly snows in Riverdale. During 0.8 snowfall days, in April, Riverdale aggregates 0.28" (7mm) of snow. In Riverdale, during the entire year, snow falls for 24.5 days and aggregates up to 4.09" (104mm) of snow.Daylight
The average length of the day in April is 13h and 22min.On the first day of April, sunrise is at 6:43 am and sunset at 7:27 pm. On the last day of the month, sunrise is at 5:58 am and sunset at 7:59 pm CDT.
Sunshine
The average sunshine in April in Riverdale is 7.6h.UV index
In Riverdale, the average daily maximum UV index in April is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV rays for the ordinary person.Note: In April, a regular UV index of 4 translates into these guidelines:
Be vigilant - A duty to shield skin and eyes from injury exists. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Riverdale in April?
What is the average humidity in April in Riverdale?
How many days does it rain in April in Riverdale?
What is the last month it snows in Riverdale?
How many hours of daylight does Riverdale have in April?
What time are sunrise and sunset in April in Riverdale?
How long on average sun shines in April in Riverdale?
What is the UV index intensity in April in Riverdale?
Average temperature in April
Riverdale, IA
- Average high temperature in April: 59°F
The warmest month (with the highest average high temperature) is July (81.7°F).
The month with the lowest average high temperature is January (28.2°F).
- Average low temperature in April: 42.4°F
The month with the highest average low temperature is July (64.8°F).
The coldest month (with the lowest average low temperature) is January (15.4°F).
Average pressure in April
Riverdale, IA
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).
Average wind speed in April
Riverdale, IA
- Average wind speed in April: 10.6mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.7mph).
Average humidity in April
Riverdale, IA
- Average humidity in April: 74%
The months with the highest relative humidity are January and July (83%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Riverdale, IA
- Average rainfall in April: 1.02"
The wettest month (with the highest rainfall) is May (1.61").
The driest month (with the least rainfall) is December (0.35").
Average rainfall days in April
Riverdale, IA
- Average rainfall days in April: 11.8 days
The month with the highest number of rainy days is May (13.4 days).
The month with the least rainy days is January (3.2 days).
Average snowfall in April
Riverdale, IA
- Average snowfall in April: 0.28"
The month with the highest snowfall is January (1.26").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in April
Riverdale, IA
- Average snowfall days in April: 0.8 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 and August (0 days).
Average daylight in April /
Average sunshine in April
Riverdale, 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 12min).
- Average sunshine in April: 7h and 4min
The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 3h and 54min).
Average sunshine days in April
Riverdale, IA
- Average sunshine days in April: 16.7 days
The month with the most sunshine days is December (22.4 days).
The month with the least sunshine days is June (14.4 days).
Average UV index in April
Riverdale, IA
- Average UV index in April: 4
The month with the highest UV index is July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in April
Riverdale, IA
- Average cloud cover in April: 49
The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is August (Cloud cover 30).
Average visibility in April
Riverdale, 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).
Riverdale, Iowa, USA
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