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 onset of April brings a rise in the average high-temperature, elevating from a fresh 54.1°F (12.3°C) in March to a refreshing 66°F (18.9°C). Throughout April, the average low-temperature records at a chilly 47.1°F (8.4°C).Humidity
In April, the average relative humidity is 77%.Rainfall
April is the month with the most rainfall. Rain falls for 15 days and accumulates 3.31" (84mm) of precipitation.Snowfall
January through April, September through December are months with snowfall in Alton. April is the last month it regularly snows in Alton. During 0.6 snowfall days, in April, Alton aggregates 0.12" (3mm) of snow. In Alton, during the entire year, snow falls for 26.8 days and aggregates up to 7.91" (201mm) of snow.Daylight
In April, the average length of the day in Alton is 13h and 13min.On the first day of April in Alton, sunrise is at 7:29 am and sunset at 8:09 pm. On the last day of the month, sunrise is at 6:49 am and sunset at 8:36 pm EDT.
Sunshine
In Alton, the average sunshine in April is 7.5h.UV index
In Alton, Indiana, the average daily maximum UV index in April is 5. A UV Index of 3 to 5 symbolizes a moderate threat to health from unprotected exposure to Sun's UV rays for the average person.Note: In April, the maximum UV index of 5 suggests this advice:
Put precautions into practice - Guidance to elude sunburn is provided. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Wearing a wide-brim hat can block approximately 50% of UV radiation, protecting the eyes. Note this! The Sun's UV radiation can nearly be doubled by the reflection off snow.
Frequently asked questions
What are the temperatures in Alton in April?
What is the average humidity in April in Alton?
What is the rainiest month in Alton?
How much does it rain in Alton in April?
What is the last month it snows in Alton?
What is the average length of the day in April in Alton?
When is the sunrise / sunset in April in Alton?
How long on average sun shines in April in Alton?
What is the UV index reading in April in Alton?
Average temperature in April
Alton, IN
- Average high temperature in April: 66°F
The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in April: 47.1°F
The month with the highest average low temperature is July (67.1°F).
The coldest month (with the lowest average low temperature) is January (25.7°F).
Average pressure in April
Alton, IN
- Average pressure in April: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in April
Alton, IN
- Average wind speed in April: 7.6mph
The windiest months (with the highest average wind speed) are January and February (7.7mph).
The calmest months (with the lowest average wind speed) are July and August (4.8mph).
Average humidity in April
Alton, IN
- Average humidity in April: 77%
The months with the highest relative humidity are February and December (80%).
The month with the lowest relative humidity is October (74%).
Average rainfall in April
Alton, IN
- Average rainfall in April: 3.31"
The wettest month (with the highest rainfall) is April (3.31").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in April
Alton, IN
- Average rainfall days in April: 15 days
The month with the highest number of rainy days is May (18.7 days).
The month with the least rainy days is November (9.8 days).
Average snowfall in April
Alton, IN
- Average snowfall in April: 0.12"
The month with the highest snowfall is January (2.24").
The months with the least snowfall are May, June, July and August (0").
Average snowfall days in April
Alton, IN
- Average snowfall days in April: 0.6 days
The month with the highest number of snowfall days is January (7.6 days).
The months with the least snowfall days are May, June, July and August (0 days).
Average daylight in April /
Average sunshine in April
Alton, IN
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in April: 7h and 3min
The month with the most sunshine is July (Average sunshine: 10h and 18min).
The month with the least sunshine is December (Average sunshine: 4h and 24min).
Average sunshine days in April
Alton, IN
- Average sunshine days in April: 12.8 days
The month with the most sunshine days is October (19.1 days).
The month with the least sunshine days is May (11.1 days).
Average UV index in April
Alton, IN
- Average UV index in April: 5
The months with the highest UV index are May, June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).
Average cloud cover in April
Alton, IN
- Average cloud cover in April: 43
The month with the most cloud cover is January (Cloud cover 56).
The month with the least cloud cover is August (Cloud cover 29).
Average visibility in April
Alton, IN
- Average visibility in April: 6mi
The months with the highest visibility are March, April, June, August, October and November (6mi).
The months with the lowest visibility are January, February, May, July, September and December (5mi).
Alton, Indiana, USA
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