April weather forecast
Rio, IL

Weather in April

April in Rio, Illinois, is a moderate spring month, with temperature in the range of an average high of 59.9°F (15.5°C) and an average low of 43.2°F (6.2°C).

Temperature

In April, the average high-temperature increases from a frosty 48°F (8.9°C) in March to a mild 59.9°F (15.5°C). The average low-temperature, in April, is 43.2°F (6.2°C).

Humidity

In Rio, Illinois, the average relative humidity in April is 75%.

Rainfall

In Rio, in April, during 11.8 rainfall days, 1.3" (33mm) of precipitation is typically accumulated. In Rio, during the entire year, the rain falls for 109.9 days and collects up to 11.14" (283mm) of precipitation.

Snowfall

January through April, October through December are months with snowfall. April is the last month it regularly snows. During 0.9 snowfall days, Rio aggregates 0.75" (19mm) of snow. In Rio, during the entire year, snow falls for 28 days and aggregates up to 4.53" (115mm) of snow.

Daylight

In April, the average length of the day in Rio, Illinois, is 13h and 20min.
On the first day of the month, sunrise is at 6:44 am and sunset at 7:26 pm. On the last day of April, in Rio, sunrise is at 6:00 am and sunset at 7:57 pm CDT.

Sunshine

In April, the average sunshine in Rio, Illinois, is 7.9h.

UV index

In April, the average daily maximum UV index in Rio is 4. A UV Index reading of 3 to 5 represents a moderate threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The daily maximum UV index of 4 in April interpret into the following advice:
Take precautions. Light skin individuals may get burned in less than 30 minutes. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. 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. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the temperature in April in Rio?

The average high-temperature, in April, is 59.9°F (15.5°C), while the average low-temperature is 43.2°F (6.2°C).

What is the average humidity in April in Rio?

The average relative humidity in April in Rio is 75%.

How many days does it rain in April in Rio?

In Rio, Illinois, in April, during 11.8 rainfall days, 1.3" (33mm) of precipitation is typically accumulated.

What is the last month it snows in Rio?

April is the last month it regularly snows in Rio, Illinois. During 0.9 snowfall days, in April, Rio aggregates 0.75" (19mm) of snow.

What is the average length of the day in April in Rio?

The average day length in April is 13h and 20min.

What time are sunrise and sunset in April in Rio?

In April, on the first day of the month, sunrise is at 6:44 am and sunset at 7:26 pm. On the last day of the month, sunrise is at 6:00 am and sunset at 7:57 pm CDT.

How many hours of sunshine does Rio have in April?

In Rio, Illinois, the average sunshine duration in April is 7.9h.

How high is the UV index in April in Rio?

In Rio, Illinois, the average daily maximum UV index in April is 4. A UV Index reading of 3 to 5 represents a medium health risk from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in April
Rio, IL

Average temperature in April - Rio, IL
  • Average high temperature in April: 59.9°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 (29.5°F).

  • Average low temperature in April: 43.2°F

The month with the highest average low temperature is July (64.9°F).
The coldest month (with the lowest average low temperature) is January (17.4°F).

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Average pressure in April
Rio, IL

Average pressure in April - Rio, IL
  • 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 (29.91"Hg).

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Average wind speed in April
Rio, IL

Average wind speed in April - Rio, IL
  • Average wind speed in April: 10.8mph

The windiest month (with the highest average wind speed) is April (10.8mph).
The calmest months (with the lowest average wind speed) are July and August (6.8mph).

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Average humidity in April
Rio, IL

Average humidity in April - Rio, IL
  • Average humidity in April: 75%

The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).

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Average rainfall in April
Rio, IL

Average rainfall in April - Rio, IL
  • Average rainfall in April: 1.3"

The wettest month (with the highest rainfall) is May (1.65").
The driest months (with the least rainfall) are January and December (0.47").

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Average rainfall days in April
Rio, IL

Average rainfall days in April - Rio, IL
  • Average rainfall days in April: 11.8 days

The month with the highest number of rainy days is May (15.2 days).
The month with the least rainy days is February (3.9 days).

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Average snowfall in April
Rio, IL

Average snowfall in April - Rio, IL
  • Average snowfall in April: 0.75"

The month with the highest snowfall is January (1.38").
The months with the least snowfall are May, June, July, August and September (0").

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Average snowfall days in April
Rio, IL

Average snowfall days in April - Rio, IL
  • Average snowfall days in April: 0.9 days

The month with the highest number of snowfall days is January (8.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in April /
Average sunshine in April
Rio, IL

Average daylight in April / Average sunshine in April - Rio, IL
  • Average daylight in April: 13h and 20min

The month with the longest days is June (Average daylight: 15h and 5min).
The month with the shortest days is December (Average daylight: 9h and 16min).

  • Average sunshine in April: 7h and 54min

The month with the most sunshine is June (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in April
Rio, IL

Average sunshine days in April - Rio, IL
  • Average sunshine days in April: 16.3 days

The month with the most sunshine days is December (21.6 days).
The month with the least sunshine days is June (12.4 days).

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Average UV index in April
Rio, IL

Average UV index in April - Rio, IL
  • 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 December (UV index 1).

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Average cloud cover in April
Rio, IL

Average cloud cover in April - Rio, IL
  • Average cloud cover in April: 47

The month with the most cloud cover is January (Cloud cover 58).
The month with the least cloud cover is September (Cloud cover 30).

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Average visibility in April
Rio, IL

Average visibility in April - Rio, IL
  • Average visibility in April: 6mi

The months with the highest visibility are January, February, March, April, May, June, August, September, October, November and December (6mi).
The month with the lowest visibility is July (5mi).

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