May weather forecastVandalia, IL
May
Weather in May
The last month of the spring, May, is a warm month in Vandalia, Illinois, with an average temperature ranging between max 73.6°F (23.1°C) and min 56.8°F (13.8°C).Temperature
The shift into May is characterized by a rise in the average high-temperature, transitioning from April's comfortable 63.7°F (17.6°C) to a warm 73.6°F (23.1°C). Vandalia's temperature drops to an average low of 56.8°F (13.8°C) during the nights of May.Humidity
In May, the average relative humidity is 80%.Rainfall
In Vandalia, in May, during 18.3 rainfall days, 4.09" (104mm) of precipitation is typically accumulated. Throughout the year, there are 164.1 rainfall days, and 36.73" (933mm) of precipitation is accumulated.Snowfall
In Vandalia, snow does not fall in May through October.Daylight
In Vandalia, the average length of the day in May is 14h and 19min.On the first day of May in Vandalia, sunrise is at 5:57 am and sunset at 7:49 pm. On the last day of the month, sunrise is at 5:32 am and sunset at 8:15 pm CDT.
Sunshine
In Vandalia, the average sunshine in May is 9h.UV index
In Vandalia, the average daily maximum UV index in May is 5. A UV Index of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV rays for average individuals.Note: A maximum high daily UV index of 5 during May translates into the following directions:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Sun-related eye harm can be minimized with proper sunglasses offering UVA and UVB coverage.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Vandalia, IL
- Average high temperature in May: 73.6°F
The warmest month (with the highest average high temperature) is July (84°F).
The month with the lowest average high temperature is January (36°F).
- Average low temperature in May: 56.8°F
The month with the highest average low temperature is July (67.3°F).
The coldest month (with the lowest average low temperature) is January (23.4°F).
Average pressure in May
Vandalia, IL
- 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
Vandalia, IL
- Average wind speed in May: 8.1mph
The windiest month (with the highest average wind speed) is January (10.3mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).
Average humidity in May
Vandalia, IL
- Average humidity in May: 80%
The month with the highest relative humidity is July (81%).
The month with the lowest relative humidity is October (71%).
Average rainfall in May
Vandalia, IL
- Average rainfall in May: 4.09"
The wettest month (with the highest rainfall) is June (4.57").
The driest month (with the least rainfall) is February (2.01").
Average rainfall days in May
Vandalia, IL
- Average rainfall days in May: 18.3 days
The month with the highest number of rainy days is May (18.3 days).
The month with the least rainy days is January (9.2 days).
Average snowfall in May
Vandalia, IL
- Average snowfall in May: 0"
The month with the highest snowfall is December (2.4").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Vandalia, IL
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (8.3 days).
The months with the least snowfall days are May, June, July, August and September (0 days).
Average daylight in May /
Average sunshine in May
Vandalia, IL
- Average daylight in May: 14h and 18min
The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 18min).
Average sunshine days in May
Vandalia, IL
- Average sunshine days in May: 9.8 days
The month with the most sunshine days is October (17.2 days).
The month with the least sunshine days is July (8.6 days).
Average UV index in May
Vandalia, IL
- Average UV index in May: 5
The months with the highest UV index are 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 May
Vandalia, IL
- Average cloud cover in May: 40
The month with the most cloud cover is January (Cloud cover 53).
The months with the least cloud cover are June, July and September (Cloud cover 30).
Average visibility in May
Vandalia, 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).
