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 April begins, there is an increase in the average high-temperature, moving from a frosty 45.7°F (7.6°C) in March to a refreshing 58.5°F (14.7°C). In Grinnell, in April, the average low-temperature is a cold 41.9°F (5.5°C).Humidity
The average relative humidity in April in Grinnell is 74%.Rainfall
In Grinnell, in April, it is raining for 12 days, with typically 1.3" (33mm) of accumulated precipitation. In Grinnell, during the entire year, the rain falls for 117.5 days and collects up to 13.03" (331mm) of precipitation.Snowfall
January through May, October through December are months with snowfall. In Grinnell, in April, snow falls for 1.3 days, with typically accumulated 0.31" (8mm) of snow. Throughout the year, there are 30.7 snowfall days, and 6.06" (154mm) of snow is accumulated.Daylight
In April, the average length of the day is 13h and 22min.On the first day of April in Grinnell, Iowa, sunrise is at 6:52 am and sunset at 7:36 pm. On the last day of the month, sunrise is at 6:07 am and sunset at 8:08 pm CDT.
Sunshine
In Grinnell, the average sunshine in April is 7.9h.UV index
The average daily maximum UV index in April in Grinnell, Iowa, is 4. A UV Index of 3 to 5 symbolizes a medium vulnerability from exposure to the Sun's UV radiation for the ordinary person.Note: In April, the maximum UV index of 4 transforms into these recommendations:
Be vigilant - Preventing sunburn is recommended. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Sunglasses providing both UVA and UVB protection are non-negotiable on sunlit days. Keep in mind! Snow's reflective quality 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
What is the temperature in April in Grinnell?
What is the average humidity in April in Grinnell?
How many days does it rain in April in Grinnell?
How many days does it snow in April in Grinnell?
What is the average length of the day in April in Grinnell?
What time are sunrise and sunset in April in Grinnell?
How long on average sun shines in April in Grinnell?
What is the UV index intensity in April in Grinnell?
Average temperature in April
Grinnell, IA
- Average high temperature in April: 58.5°F
The warmest month (with the highest average high temperature) is July (81.1°F).
The month with the lowest average high temperature is January (27°F).
- Average low temperature in April: 41.9°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 (13.8°F).
Average pressure in April
Grinnell, IA
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.15"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in April
Grinnell, IA
- Average wind speed in April: 10.7mph
The windiest month (with the highest average wind speed) is April (10.7mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in April
Grinnell, IA
- Average humidity in April: 74%
The month with the highest relative humidity is January (84%).
The month with the lowest relative humidity is October (71%).
Average rainfall in April
Grinnell, IA
- Average rainfall in April: 1.3"
The wettest months (with the highest rainfall) are May and June (1.97").
The driest month (with the least rainfall) is January (0.47").
Average rainfall days in April
Grinnell, IA
- Average rainfall days in April: 12 days
The month with the highest number of rainy days is June (15.1 days).
The month with the least rainy days is February (4.1 days).
Average snowfall in April
Grinnell, IA
- Average snowfall in April: 0.31"
The month with the highest snowfall is January (1.81").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Grinnell, IA
- Average snowfall days in April: 1.3 days
The month with the highest number of snowfall days is January (8.1 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Grinnell, IA
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 15h and 12min).
The month with the shortest days is December (Average daylight: 9h and 12min).
- Average sunshine in April: 7h and 5min
The month with the most sunshine is July (Average sunshine: 10h and 12min).
The month with the least sunshine is January (Average sunshine: 4h and 6min).
Average sunshine days in April
Grinnell, IA
- Average sunshine days in April: 14.9 days
The month with the most sunshine days is January (21.1 days).
The month with the least sunshine days is June (11.5 days).
Average UV index in April
Grinnell, IA
- Average UV index in April: 4
The months with the highest UV index are June and July (UV index 6).
The month with the lowest UV index is January (UV index 1).
Average cloud cover in April
Grinnell, IA
- Average cloud cover in April: 46
The month with the most cloud cover is January (Cloud cover 55).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in April
Grinnell, IA
- Average visibility in April: 6mi
The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).
Grinnell, Iowa, USA
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