April weather forecastAlton, IN
April
Weather in April
April is a refreshing spring month in Alton, Indiana, with an average temperature varying between 66°F (18.9°C) and 47.1°F (8.4°C).Temperature
As Alton transitions into April, the average high-temperature is observed to rise from a cool 54.1°F (12.3°C) in March to an enjoyable 66°F (18.9°C). Alton experiences a mean temperature of 47.1°F (8.4°C) during April nights.Humidity
In Alton, the average relative humidity in April is 77%.Rainfall
The month with the most rainfall is April, when the rain falls for 15 days and typically aggregates up to 3.31" (84mm) of precipitation.Snowfall
Months with snowfall are January through April, September through December. April is the last month it regularly snows. During 0.6 snowfall days, in April, Alton aggregates 0.12" (3mm) of snow. Throughout the year, there are 26.8 snowfall days, and 7.91" (201mm) of snow is accumulated.Daylight
In April, the average length of the day in Alton is 13h and 13min.On the first day of April, 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, the average daily maximum UV index in April is 5. 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 5 transforms into these recommendations:
Prioritize safety - The need to safeguard skin and eyes from harm is emphasized. Solar radiation peaks around mid-day, so it's wise to limit exposure to the Sun at this time. Counter UV radiation's ill effects with clothing designed for sun safety and UV-resistant eyewear. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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 12min
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 30min
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).
