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
In April, the average high-temperature increases from a mild 57.7°F (14.3°C) in March to a comfortable 67.8°F (19.9°C). April witnesses an average nighttime temperature of 48.9°F (9.4°C) in Alton, Missouri.Humidity
In Alton, Missouri, the average relative humidity in April is 77%.Rainfall
In Alton, during April, the rain falls for 13.5 days and regularly aggregates up to 4.13" (105mm) of precipitation. In Alton, during the entire year, the rain falls for 148 days and collects up to 35.39" (899mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. April is the last month it regularly snows in Alton. During 0.2 snowfall days, in April, Alton aggregates 0.04" (1mm) of snow. Throughout the year, in Alton, there are 8.9 snowfall days, and 4.57" (116mm) of snow is accumulated.Daylight
In Alton, Missouri, the average length of the day in April is 13h and 10min.On the first day of April, sunrise is at 6:50 am and sunset at 7:28 pm. On the last day of the month, sunrise is at 6:11 am and sunset at 7:53 pm CDT.
Sunshine
In Alton, the average sunshine in April is 8.2h.UV index
In Alton, the average daily maximum UV index in April is 5. A UV Index estimate of 3 to 5 represents a medium vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: An average UV index of 5 in April transforms into this advice:
Make use of precautions - Shielding skin and eyes from injury is a requirement. During midday, the Sun's radiation is strongest, and it's advisable to reduce direct exposure. A hat with a broad brim is indispensable, filtering out up to half of UV rays. Remember to consider! The UV radiation from the Sun can be intensified nearly twice by the reflection of snow.
Frequently asked questions
What is the usual temperature for Alton in April?
What is the average humidity in April in Alton?
How many days does it rain in April in Alton?
What is the last month it snows in Alton?
How many hours of daylight does Alton have in April?
When are sunrise and sunset in April in Alton?
How many hours of sunshine does Alton have in April?
What is the UV index reading in April in Alton?
Average temperature in April
Alton, MO
- Average high temperature in April: 67.8°F
The warmest month (with the highest average high temperature) is July (89.4°F).
The month with the lowest average high temperature is January (43.3°F).
- Average low temperature in April: 48.9°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).
Average pressure in April
Alton, MO
- Average pressure in April: 29.95"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in April
Alton, MO
- Average wind speed in April: 8.1mph
The windiest months (with the highest average wind speed) are January, February, March and April (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (5.3mph).
Average humidity in April
Alton, MO
- Average humidity in April: 77%
The months with the highest relative humidity are March and May (79%).
The month with the lowest relative humidity is October (72%).
Average rainfall in April
Alton, MO
- Average rainfall in April: 4.13"
The wettest month (with the highest rainfall) is May (4.25").
The driest month (with the least rainfall) is September (1.57").
Average rainfall days in April
Alton, MO
- Average rainfall days in April: 13.5 days
The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is January (8.6 days).
Average snowfall in April
Alton, MO
- Average snowfall in April: 0.04"
The month with the highest snowfall is February (1.26").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in April
Alton, MO
- Average snowfall days in April: 0.2 days
The month with the highest number of snowfall days is February (2.8 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in April /
Average sunshine in April
Alton, MO
- Average daylight in April: 13h and 1min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in April: 8h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).
Average sunshine days in April
Alton, MO
- Average sunshine days in April: 14.5 days
The month with the most sunshine days is December (19.6 days).
The month with the least sunshine days is May (12.3 days).
Average UV index in April
Alton, MO
- Average UV index in April: 5
The month with the highest UV index is June (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in April
Alton, MO
- Average cloud cover in April: 43
The month with the most cloud cover is March (Cloud cover 49).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in April
Alton, MO
- Average visibility in April: 6mi
The months with the highest visibility are January, February, March, April, June, August, September, October, November and December (6mi).
The months with the lowest visibility are May and July (5mi).
Alton, Missouri, USA
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