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 start of April brings a shift in the average high-temperature, increasing from March's frosty 47.1°F (8.4°C) to a mild 59.2°F (15.1°C). Throughout April, an average low-temperature of 42.4°F (5.8°C) is expected in Altona.Humidity
In Altona, the average relative humidity in April is 74%.Rainfall
In April, the rain falls for 14.1 days. Throughout April, 2.2" (56mm) of precipitation is accumulated. In Altona, during the entire year, the rain falls for 127.7 days and collects up to 17.8" (452mm) of precipitation.Snowfall
Months with snowfall are January through April, October through December. April is the last month it regularly snows in Altona. During 1.5 snowfall days, in April, Altona aggregates 0.71" (18mm) of snow. In Altona, during the entire year, snow falls for 35.5 days and aggregates up to 7.95" (202mm) of snow.Daylight
In April, the average length of the day in Altona, Illinois, is 13h and 20min.On the first day of the month, sunrise is at 6:42 am and sunset at 7:26 pm. On the last day of April, sunrise is at 5:58 am and sunset at 7:57 pm CDT.
Sunshine
In April, the average sunshine is 8h.UV index
In April, the average daily maximum UV index in Altona is 4. A UV Index value of 3 to 5 symbolizes a medium health hazard from unprotected exposure to Sun's UV rays for the average person.Note: In April, the maximum UV index of 4 suggests this advice:
Ensure safety - Imperative it is to shield skin and eyes from damage. Given the potency of the midday Sun's UV radiation, one should avoid prolonged exposure. Experience reduced UV exposure by about half when donning a wide-brim hat. Be vigilant! The reflective nature of snow can increase the Sun's UV radiation nearly twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in April in Altona?
What is the average humidity in April in Altona?
How many days does it rain in April in Altona?
What is the last month it snows in Altona?
How many hours of daylight does Altona have in April?
When is the sunrise / sunset in April in Altona?
How long on average sun shines in April in Altona?
How high is the UV index in April in Altona?
Average temperature in April
Altona, IL
- Average high temperature in April: 59.2°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 (28.2°F).
- Average low temperature in April: 42.4°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 (16.5°F).
Average pressure in April
Altona, IL
- 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 (29.91"Hg).
Average wind speed in April
Altona, IL
- Average wind speed in April: 10.6mph
The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.6mph).
Average humidity in April
Altona, IL
- Average humidity in April: 74%
The month with the highest relative humidity is July (84%).
The month with the lowest relative humidity is October (72%).
Average rainfall in April
Altona, IL
- Average rainfall in April: 2.2"
The wettest month (with the highest rainfall) is May (2.76").
The driest month (with the least rainfall) is December (0.71").
Average rainfall days in April
Altona, IL
- Average rainfall days in April: 14.1 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (4 days).
Average snowfall in April
Altona, IL
- Average snowfall in April: 0.71"
The month with the highest snowfall is January (2.17").
The months with the least snowfall are May, June, July, August and September (0").
Average snowfall days in April
Altona, IL
- Average snowfall days in April: 1.5 days
The month with the highest number of snowfall days is January (10.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in April /
Average sunshine in April
Altona, IL
- Average daylight in April: 13h and 2min
The month with the longest days is June (Average daylight: 15h and 6min).
The month with the shortest days is December (Average daylight: 9h and 18min).
- Average sunshine in April: 8h and 0min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).
Average sunshine days in April
Altona, IL
- Average sunshine days in April: 13.2 days
The month with the most sunshine days is November (19.7 days).
The month with the least sunshine days is July (11.2 days).
Average UV index in April
Altona, 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 January (UV index 1).
Average cloud cover in April
Altona, IL
- Average cloud cover in April: 46
The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 29).
Average visibility in April
Altona, 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).
Altona, Illinois, USA
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