April weather forecast
Crystal Lake, IA

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Weather in April

April is a fresh spring month in Crystal Lake, Iowa, with an average temperature fluctuating between 39.6°F (4.2°C) and 54.9°F (12.7°C).

Temperature

As April arrives, Crystal Lake's weather shows an increase in high-temperatures, moving from March's cold 41.5°F (5.3°C) to a fresh 54.9°F (12.7°C). The average low-temperature of 39.6°F (4.2°C) is witnessed during April.

Humidity

The average relative humidity in April is 71%.

Rainfall

In Crystal Lake, in April, during 14.7 rainfall days, 2.72" (69mm) of precipitation is typically accumulated. Throughout the year, in Crystal Lake, Iowa, there are 136.2 rainfall days, and 25.39" (645mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall in Crystal Lake. In Crystal Lake, in April, snow falls for 3.2 days, with typically accumulated 2.09" (53mm) of snow. Throughout the year, there are 55.1 snowfall days, and 22.05" (560mm) of snow is accumulated.

Daylight

In Crystal Lake, the average length of the day in April 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

In April, the average sunshine in Crystal Lake is 7.6h.

UV index

In Crystal Lake, the average daily maximum UV index in April is 3. A UV Index of 3 to 5 symbolizes a moderate threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum daily UV index, 3 in April, converts into the following recommendations:
Put precautions into practice - Protective measures against sun-induced damage are advised. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. On days when the sun blazes, arm yourself with sunglasses that block UVA and UVB radiation. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Frequently asked questions

What is the average April temperature in Crystal Lake?

The average high-temperature, in April, in Crystal Lake, is 54.9°F (12.7°C), while the average low-temperature is 39.6°F (4.2°C).

What is the average humidity in April in Crystal Lake?

In Crystal Lake, the average relative humidity in April is 71%.

How much does it rain in Crystal Lake in April?

In Crystal Lake, during April, the rain falls for 14.7 days and regularly aggregates up to 2.72" (69mm) of precipitation.

How many days does it snow in April in Crystal Lake?

In Crystal Lake, Iowa, in April, during 3.2 snowfall days, 2.09" (53mm) of snow is typically accumulated.

How many hours of daylight does Crystal Lake have in April?

The average day length in April in Crystal Lake is 13h and 26min.

When are sunrise and sunset in April in Crystal Lake?

On the first day of April in Crystal Lake, 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.

How long on average sun shines in April in Crystal Lake?

In Crystal Lake, Iowa, the average sunshine duration in April is 7.6h.

What is the UV index reading in April in Crystal Lake?

In April, the average daily maximum UV index in Crystal Lake is 3. A UV Index value of 3 to 5 symbolizes a medium hazard to health from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Crystal Lake, IA

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).

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Average pressure in April
Crystal Lake, IA

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).

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Average wind speed in April
Crystal Lake, IA

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).

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Average humidity in April
Crystal Lake, IA

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%).

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Average rainfall in April
Crystal Lake, IA

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").

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Average rainfall days in April
Crystal Lake, IA

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).

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Average snowfall in April
Crystal Lake, IA

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").

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Average snowfall days in April
Crystal Lake, IA

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).

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Average daylight in April /
Average sunshine in April
Crystal Lake, IA

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).

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Average sunshine days in April
Crystal Lake, IA

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).

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Average UV index in April
Crystal Lake, IA

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).

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Average cloud cover in April
Crystal Lake, IA

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).

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Average visibility in April
Crystal Lake, IA

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).

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Crystal Lake, Iowa, USA

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