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
Castalia, Iowa, experiences a temperature shift with the start of April, with average high-temperatures moving from an icy 41.4°F (5.2°C) in March to a cool 54.3°F (12.4°C). Castalia encounters an average low-temperature of 37.9°F (3.3°C) during April nights.Humidity
In April, the average relative humidity in Castalia is 77%.Rainfall
In Castalia, in April, during 15.3 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. Throughout the year, there are 131 rainfall days, and 27.91" (709mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In Castalia, Iowa, during April, snow falls for 3 days and regularly aggregates up to 2.17" (55mm) of snow. Throughout the year, there are 52.3 snowfall days, and 21.26" (540mm) of snow is accumulated.Daylight
The average length of the day in April is 13h and 26min.On the first day of the month, sunrise is at 6:47 am and sunset at 7:33 pm. On the last day of April, sunrise is at 6:00 am and sunset at 8:07 pm CDT.
Sunshine
In Castalia, the average sunshine in April is 7.3h.UV index
The average daily maximum UV index in April is 3. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: An average maximum UV index of 3 in April leads to these recommendations:
Take necessary precautions - Protection from skin and eye injury is mandatory. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Consider this! The reflection from snow can almost double the intensity of the Sun's UV radiation.
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Data Sources | Weather Forecasting & Climate
Frequently asked questions
What are April temperatures?
What is the average humidity in April?
How many days does it rain in April in Castalia?
How many days does it snow in April?
How many hours of daylight does Castalia have in April?
What time are sunrise and sunset in April in Castalia?
How many hours of sunshine does Castalia have in April?
What is the UV index intensity in April?
Average temperature in April
Castalia, IA
- Average high temperature in April: 54.3°F
The warmest month (with the highest average high temperature) is July (79°F).
The month with the lowest average high temperature is January (22.5°F).
- Average low temperature in April: 37.9°F
The month with the highest average low temperature is July (62.2°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in April
Castalia, IA
- Average pressure in April: 29.94"Hg
The month with the highest atmospheric pressure is January (30.13"Hg).
The month with the lowest atmospheric pressure is June (29.89"Hg).
Average wind speed in April
Castalia, IA
- Average wind speed in April: 10.5mph
The windiest month (with the highest average wind speed) is April (10.5mph).
The calmest months (with the lowest average wind speed) are July and August (7mph).
Average humidity in April
Castalia, IA
- Average humidity in April: 77%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (75%).
Average rainfall in April
Castalia, IA
- Average rainfall in April: 3.19"
The wettest month (with the highest rainfall) is June (4.33").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in April
Castalia, IA
- Average rainfall days in April: 15.3 days
The month with the highest number of rainy days is June (17.7 days).
The month with the least rainy days is February (3.8 days).
Average snowfall in April
Castalia, IA
- Average snowfall in April: 2.17"
The month with the highest snowfall is February (5.16").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Castalia, IA
- Average snowfall days in April: 3 days
The month with the highest number of snowfall days is January (13.3 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Castalia, IA
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 15h and 18min).
The month with the shortest days is December (Average daylight: 9h and 6min).
- Average sunshine in April: 7h and 2min
The month with the most sunshine is August (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in April
Castalia, IA
- Average sunshine days in April: 11.5 days
The month with the most sunshine days is September (17 days).
The month with the least sunshine days is June (10.5 days).
Average UV index in April
Castalia, IA
- Average UV index in April: 3
The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, November and December (UV index 1).
Average cloud cover in April
Castalia, IA
- Average cloud cover in April: 50
The month with the most cloud cover is January (Cloud cover 64).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in April
Castalia, IA
- Average visibility in April: 6mi
The months with the highest visibility are March, April, May, June, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February and July (5mi).
Castalia, Iowa, USA
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