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 to April introduces an increase in the average high-temperature, shifting from a chilly 45.1°F (7.3°C) in March to a mild 57.7°F (14.3°C). Throughout the month of April, Keystone observes an average nighttime temperature of 41.4°F (5.2°C).Humidity
The average relative humidity in April in Keystone is 74%.Rainfall
In Keystone, Iowa, in April, it is raining for 14.5 days, with typically 3.23" (82mm) of accumulated precipitation. In Keystone, during the entire year, the rain falls for 139 days and collects up to 29.49" (749mm) of precipitation.Snowfall
Months with snowfall in Keystone are January through May, October through December. In Keystone, in April, snow falls for 1.4 days, with typically accumulated 0.79" (20mm) of snow. Throughout the year, there are 39 snowfall days, and 16.69" (424mm) of snow is accumulated.Daylight
In Keystone, the average length of the day in April is 13h and 23min.On the first day of April, sunrise is at 6:49 am and sunset at 7:34 pm. On the last day of the month, sunrise is at 6:04 am and sunset at 8:07 pm CDT.
Sunshine
In April, the average sunshine in Keystone is 7.6h.UV index
In April, the average daily maximum UV index in Keystone, Iowa, is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from unprotected exposure to Sun's UV rays for the average person.Note: In April, the maximum UV index of 3 transforms into these recommendations:
Be mindful. Those with pale skin might receive burns in fewer than 30 minutes. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Take precaution! The reflection from snow can almost double the UV radiation of the Sun.
Frequently asked questions
What are April temperatures in Keystone?
What is the average humidity in April in Keystone?
How much does it rain in Keystone in April?
How many days does it snow in April in Keystone?
How many hours of daylight does Keystone have in April?
What time are sunrise and sunset in April in Keystone?
How many hours of sunshine does Keystone have in April?
What is the UV index intensity in April in Keystone?
Average temperature in April
Keystone, IA
- Average high temperature in April: 57.7°F
The warmest month (with the highest average high temperature) is July (80.8°F).
The month with the lowest average high temperature is January (25.9°F).
- Average low temperature in April: 41.4°F
The month with the highest average low temperature is July (64.4°F).
The coldest month (with the lowest average low temperature) is January (13.5°F).
Average pressure in April
Keystone, IA
- Average pressure in April: 29.93"Hg
The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in April
Keystone, IA
- Average wind speed in April: 10.8mph
The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest month (with the lowest average wind speed) is August (7mph).
Average humidity in April
Keystone, IA
- Average humidity in April: 74%
The month with the highest relative humidity is January (85%).
The month with the lowest relative humidity is October (72%).
Average rainfall in April
Keystone, IA
- Average rainfall in April: 3.23"
The wettest month (with the highest rainfall) is May (4.61").
The driest month (with the least rainfall) is January (1.18").
Average rainfall days in April
Keystone, IA
- Average rainfall days in April: 14.5 days
The month with the highest number of rainy days is June (19.3 days).
The month with the least rainy days is January (4.5 days).
Average snowfall in April
Keystone, IA
- Average snowfall in April: 0.79"
The month with the highest snowfall is January (5.24").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Keystone, IA
- Average snowfall days in April: 1.4 days
The month with the highest number of snowfall days is February (10.6 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Keystone, 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 4min
The month with the most sunshine is July (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in April
Keystone, IA
- Average sunshine days in April: 13.4 days
The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is June (8.4 days).
Average UV index in April
Keystone, IA
- Average UV index in April: 3
The month with the highest UV index is June (UV index 6).
The months with the lowest UV index are January, February, October, November and December (UV index 2).
Average cloud cover in April
Keystone, IA
- Average cloud cover in April: 48
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).
Average visibility in April
Keystone, IA
- Average visibility in April: 6mi
The months with the highest visibility are February, March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January and July (5mi).
Keystone, Iowa, USA
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