Contents
- Weather in May
- Frequently asked questions
- Average temperature in May
- Average pressure in May
- Average wind speed in May
- Average humidity in May
- Average rainfall in May
- Average rainfall days in May
- Average snowfall in May
- Average snowfall days in May
- Average daylight in May
- Average sunshine in May
- Average sunshine days in May
- Average UV index in May
- Average cloud cover in May
- Average visibility in May
Weather in May
Temperature
May brings a rise in Alton's average high-temperature, moving from a refreshing 67.8°F (19.9°C) in April to a warm 77.2°F (25.1°C). Throughout May, Alton witnesses a consistent average low-temperature of 57.6°F (14.2°C).Humidity
The months with the highest humidity are March and May, with an average relative humidity of 79%.Rainfall
May is the month with the most rainfall in Alton, Missouri. Rain falls for 16.5 days and accumulates 4.25" (108mm) of precipitation.Snowfall
In Alton, Missouri, snow does not fall in May through October.Daylight
In May, the average length of the day in Alton is 14h and 8min.On the first day of May in Alton, sunrise is at 6:10 am and sunset at 7:54 pm. On the last day of the month, sunrise is at 5:48 am and sunset at 8:18 pm CDT.
Sunshine
In May, the average sunshine in Alton, Missouri, is 8.7h.UV index
In Alton, the average daily maximum UV index in May is 6. A UV Index reading of 6 to 7 represents a high health hazard from unsafe exposure to UV radiation for the ordinary person.Note: The maximum daily UV index of 6 in May converts into the following recommendations:
Sustain precautions and conform to sun safety norms. Preventing sunburn is necessary. Stay in the shade and avoid direct Sun exposure from 10 a.m. to 4 p.m., a time when UV radiation is at its strongest, and remember that parasols or canopies do not offer full protection. Wearing sunglasses with both UVA and UVB protection effectively reduces sun-induced eye damage.
Frequently asked questions
What is the temperature in May in Alton?
What are the most humid months in Alton?
What is the average humidity in May in Alton?
What is the wettest month in Alton?
How much does it rain in Alton in May?
When it does not snow in Alton?
Does it snow in Alton in May?
How many hours of daylight does Alton have in May?
When is the sunrise / sunset in May in Alton?
How many hours of sunshine does Alton have in May?
What is the UV index intensity in May in Alton?
Average temperature in May
Alton, MO
- Average high temperature in May: 77.2°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 May: 57.6°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 May
Alton, MO
- Average pressure in May: 29.96"Hg
The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.93"Hg).
Average wind speed in May
Alton, MO
- Average wind speed in May: 6.9mph
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 May
Alton, MO
- Average humidity in May: 79%
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 May
Alton, MO
- Average rainfall in May: 4.25"
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 May
Alton, MO
- Average rainfall days in May: 16.5 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 May
Alton, MO
- Average snowfall in May: 0"
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 May
Alton, MO
- Average snowfall days in May: 0 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 May /
Average sunshine in May
Alton, MO
- Average daylight in May: 14h 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 May: 8h and 4min
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 May
Alton, MO
- Average sunshine days in May: 12.3 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 May
Alton, MO
- Average UV index in May: 6
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 May
Alton, MO
- Average cloud cover in May: 41
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 May
Alton, MO
- Average visibility in May: 5mi
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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