May weather forecastMount Vernon, VA
May
Weather in May
May, the last month of the spring in Mount Vernon, is a moderately hot month, with temperature in the range of an average low of 56.8°F (13.8°C) and an average high of 74.7°F (23.7°C).Temperature
In Mount Vernon, the average high-temperature in May increases from a refreshing 65.1°F (18.4°C) in April to a warm 74.7°F (23.7°C). The low-temperature averages to a moderate 56.8°F (13.8°C) during the nights of May.Humidity
May, October and December, with an average relative humidity of 76%, are the most humid months.Rainfall
In May, the rain falls for 17.7 days. Throughout May, 2.95" (75mm) of precipitation is accumulated. In Mount Vernon, during the entire year, the rain falls for 158.2 days and collects up to 30.67" (779mm) of precipitation.Snowfall
May through October are months without snowfall in Mount Vernon.Daylight
In Mount Vernon, the average length of the day in May is 14h and 18min.On the first day of May, sunrise is at 6:09 am and sunset at 8:01 pm. On the last day of the month, sunrise is at 5:45 am and sunset at 8:27 pm EDT.
Sunshine
The average sunshine in May is 9h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index estimate of 6 to 7 represents a high health hazard from unprotected exposure to Sun's UV rays for ordinary individuals.Note: In May, a daily maximum UV index of 6 leads to the following instructions:
Adhere to precautions and respect sun safety doctrines. Avoiding sunburn is vital. Stay out of direct sunlight between 10 a.m. and 4 p.m., when UV radiation is most intense, and remember that not all shade structures provide complete protection. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Mount Vernon, VA
- Average high temperature in May: 74.7°F
The warmest month (with the highest average high temperature) is July (87.8°F).
The month with the lowest average high temperature is January (40.6°F).
- Average low temperature in May: 56.8°F
The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (27.7°F).
Average pressure in May
Mount Vernon, VA
- Average pressure in May: 30.01"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.95"Hg).
Average wind speed in May
Mount Vernon, VA
- Average wind speed in May: 6.3mph
The windiest month (with the highest average wind speed) is March (7.8mph).
The calmest month (with the lowest average wind speed) is August (5mph).
Average humidity in May
Mount Vernon, VA
- Average humidity in May: 76%
The months with the highest relative humidity are May, October and December (76%).
The months with the lowest relative humidity are April and July (71%).
Average rainfall in May
Mount Vernon, VA
- Average rainfall in May: 2.95"
The wettest month (with the highest rainfall) is August (3.43").
The driest month (with the least rainfall) is September (1.93").
Average rainfall days in May
Mount Vernon, VA
- Average rainfall days in May: 17.7 days
The month with the highest number of rainy days is May (17.7 days).
The month with the least rainy days is November (8.5 days).
Average snowfall in May
Mount Vernon, VA
- Average snowfall in May: 0"
The month with the highest snowfall is January (2.48").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Mount Vernon, VA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is January (4.5 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, VA
- Average daylight in May: 14h and 18min
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 30min).
- Average sunshine in May: 9h and 0min
The month with the most sunshine is July (Average sunshine: 10h and 48min).
The month with the least sunshine is February (Average sunshine: 5h and 6min).
Average sunshine days in May
Mount Vernon, VA
- Average sunshine days in May: 11.5 days
The month with the most sunshine days is November (19.8 days).
The month with the least sunshine days is May (11.5 days).
Average UV index in May
Mount Vernon, VA
- 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 and December (UV index 2).
Average cloud cover in May
Mount Vernon, VA
- Average cloud cover in May: 43
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in May
Mount Vernon, VA
- Average visibility in May: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October, November and December (6mi).
The month with the lowest visibility is May (5mi).
