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
As April transitions into May, Mount Vernon sees a rise in the average high-temperature, moving from a refreshing 65.1°F (18.4°C) to a moderately hot 74.8°F (23.8°C). Mount Vernon's nighttime temperature during May is consistently averaged at a moderate 57.9°F (14.4°C).Humidity
May is the most humid month in Mount Vernon, Illinois, with an average relative humidity of 80%.Rainfall
In Mount Vernon, during May, the rain falls for 17 days and regularly aggregates up to 3.23" (82mm) of precipitation. Throughout the year, there are 145.8 rainfall days, and 29.13" (740mm) of precipitation is accumulated.Snowfall
In Mount Vernon, snow does not fall in May through October.Daylight
In Mount Vernon, the average length of the day in May is 14h and 16min.On the first day of the month, sunrise is at 5:57 am and sunset at 7:47 pm. On the last day of May, in Mount Vernon, Illinois, sunrise is at 5:33 am and sunset at 8:13 pm CDT.
Sunshine
The average sunshine in May is 9.2h.UV index
The months with the highest UV index in Mount Vernon are May through August, with an average maximum UV index of 6. A UV Index of 6 to 7 symbolizes a high health hazard from unprotected exposure to Sun's UV rays for average individuals.Note: The UV index of 6 during May translates into the following guidance:
Inhibit overexposure. Warding off sun damage is of utmost importance. Stay in the shade and limit sun exposure from 10 a.m. to 4 p.m., when UV radiation is most potent. Keep in mind that shade structures like parasols or canopies do not offer full protection. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the usual temperature for Mount Vernon in May?
What is the most humid month in Mount Vernon?
What is the average humidity in May in Mount Vernon?
How many days does it rain in May in Mount Vernon?
When it does not snow in Mount Vernon?
Does it snow in Mount Vernon in May?
What is the average length of the day in May in Mount Vernon?
When are sunrise and sunset in May in Mount Vernon?
How many hours of sunshine does Mount Vernon have in May?
What are the months with the highest UV index in Mount Vernon?
How high is the UV index in May in Mount Vernon?
Average temperature in May
Mount Vernon, IL
- Average high temperature in May: 74.8°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (37.9°F).
- Average low temperature in May: 57.9°F
The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).
Average pressure in May
Mount Vernon, IL
- Average pressure in May: 29.97"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
Mount Vernon, IL
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is January (9.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.9mph).
Average humidity in May
Mount Vernon, IL
- Average humidity in May: 80%
The month with the highest relative humidity is May (80%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Mount Vernon, IL
- Average rainfall in May: 3.23"
The wettest month (with the highest rainfall) is April (3.78").
The driest month (with the least rainfall) is September (1.61").
Average rainfall days in May
Mount Vernon, IL
- Average rainfall days in May: 17 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is January (7.5 days).
Average snowfall in May
Mount Vernon, IL
- Average snowfall in May: 0"
The month with the highest snowfall is February (1.73").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Mount Vernon, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (4.8 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
Mount Vernon, IL
- Average daylight in May: 14h and 2min
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 May: 9h and 1min
The month with the most sunshine is June (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in May
Mount Vernon, IL
- Average sunshine days in May: 11.3 days
The month with the most sunshine days is October (20.3 days).
The month with the least sunshine days is May (11.3 days).
Average UV index in May
Mount Vernon, IL
- Average UV index in May: 6
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, November and December (UV index 2).
Average cloud cover in May
Mount Vernon, IL
- Average cloud cover in May: 38
The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is June (Cloud cover 27).
Average visibility in May
Mount Vernon, IL
- Average visibility in May: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
Mount Vernon, Illinois, USA
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