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 arrives, Crystal Lake's weather shows an increase in high-temperatures, moving from March's wintry 41.5°F (5.3°C) to a cool 54.9°F (12.7°C). The nighttime temperature, during April, averages of 39.6°F (4.2°C).Humidity
In Crystal Lake, Iowa, the average relative humidity in April is 71%.Rainfall
In Crystal Lake, during April, the rain falls for 14.7 days and regularly aggregates up to 2.72" (69mm) of precipitation. In Crystal Lake, during the entire year, the rain falls for 136.2 days and collects up to 25.39" (645mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Crystal Lake, in April, snow falls for 3.2 days, with typically accumulated 2.09" (53mm) of snow. In Crystal Lake, during the entire year, snow falls for 55.1 days and aggregates up to 22.05" (560mm) of snow.Daylight
In April, the average length of the day is 13h and 26min.On the first day of April, sunrise is at 6:55 am and sunset at 7:42 pm. On the last day of the month, sunrise is at 6:08 am and sunset at 8:16 pm CDT.
Sunshine
The average sunshine in April is 7.6h.UV index
In April, the average daily maximum UV index is 3. A UV Index estimate of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: The UV index of 3 during April translates into the following guidance:
Heed the precautions - It is counselled to guard against solar damage. Sun exposure should be minimized, especially during midday, to avoid harmful UV radiation. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the average April temperature?
What is the average humidity in April?
How many days does it rain in April?
How many days does it snow in April?
What is the average length of the day in April?
When are sunrise and sunset in April?
How long on average sun shines in April?
What is the UV index reading in April in Crystal Lake?
Average temperature in April
Crystal Lake, IA
- Average high temperature in April: 54.9°F
The warmest month (with the highest average high temperature) is July (79.3°F).
The month with the lowest average high temperature is January (22.1°F).
- Average low temperature in April: 39.6°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (9.9°F).
Average pressure in April
Crystal Lake, 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 (29.88"Hg).
Average wind speed in April
Crystal Lake, IA
- Average wind speed in April: 10.9mph
The windiest month (with the highest average wind speed) is April (10.9mph).
The calmest month (with the lowest average wind speed) is July (7.4mph).
Average humidity in April
Crystal Lake, IA
- Average humidity in April: 71%
The month with the highest relative humidity is January (89%).
The month with the lowest relative humidity is October (70%).
Average rainfall in April
Crystal Lake, IA
- Average rainfall in April: 2.72"
The wettest month (with the highest rainfall) is June (4.21").
The driest month (with the least rainfall) is January (0.98").
Average rainfall days in April
Crystal Lake, IA
- Average rainfall days in April: 14.7 days
The month with the highest number of rainy days is June (18.8 days).
The month with the least rainy days is February (3 days).
Average snowfall in April
Crystal Lake, IA
- Average snowfall in April: 2.09"
The month with the highest snowfall is February (5.79").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in April
Crystal Lake, IA
- Average snowfall days in April: 3.2 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
Crystal Lake, 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 0min).
- Average sunshine in April: 7h and 4min
The month with the most sunshine is July (Average sunshine: 9h and 48min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).
Average sunshine days in April
Crystal Lake, IA
- Average sunshine days in April: 12.2 days
The months with the most sunshine days are October and November (17.4 days).
The month with the least sunshine days is June (9.2 days).
Average UV index in April
Crystal Lake, IA
- Average UV index in April: 3
The months with the highest UV index are June and July (UV index 6).
The months with the lowest UV index are January and December (UV index 1).
Average cloud cover in April
Crystal Lake, IA
- Average cloud cover in April: 48
The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).
Average visibility in April
Crystal Lake, IA
- Average visibility in April: 6mi
The months with the highest visibility are March, April, May, June, September, October and November (6mi).
The months with the lowest visibility are January, February, July, August and December (5mi).
Crystal Lake, Iowa, USA
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