May weather forecastChantilly, VA
May
Weather in May
May, the last month of the spring in Chantilly, is a warm month, with temperature in the range of an average low of 55°F (12.8°C) and an average high of 75°F (23.9°C).Temperature
May brings a temperature increase, with average high-temperatures moving from April's enjoyable 64.9°F (18.3°C) to a warm 75°F (23.9°C). May nights are marked by an average low-temperature of 55°F (12.8°C).Humidity
In Chantilly, the average relative humidity in May is 76%.Rainfall
In May, the rain falls for 17.5 days. Throughout May, 3.15" (80mm) of precipitation is accumulated. Throughout the year, there are 156 rainfall days, and 31.18" (792mm) of precipitation is accumulated.Snowfall
In Chantilly, snow does not fall in May through October.Daylight
In May, the average length of the day in Chantilly is 14h and 19min.On the first day of May, sunrise is at 6:10 am and sunset at 8:02 pm. On the last day of the month, sunrise is at 5:46 am and sunset at 8:28 pm EDT.
Sunshine
In Chantilly, the average sunshine in May is 8.8h.UV index
The months with the highest UV index are May through August, with an average maximum UV index of 6. A UV Index reading of 6 to 7 represents a high threat to health from exposure to the Sun's UV rays for the average person.Note: The maximum UV index of 6 during May translates into these guidelines:
Evade overexposure. Individuals with fair skin risk burning in under 20 minutes. Seek shade and minimize exposure to direct Sun in a period between 10 a.m. and 4 p.m. when UV radiation is most intense; keep in mind that shade structures like parasols or canopies do not provide perfect sun protection. Protect your eyes, ears, face, and neck from the Sun by wearing a wide-brimmed hat.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in May
Chantilly, VA
- Average high temperature in May: 75°F
The warmest month (with the highest average high temperature) is July (88.2°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in May: 55°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 (25.7°F).
Average pressure in May
Chantilly, 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
Chantilly, VA
- Average wind speed in May: 6mph
The windiest months (with the highest average wind speed) are March and April (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.7mph).
Average humidity in May
Chantilly, VA
- Average humidity in May: 76%
The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (71%).
Average rainfall in May
Chantilly, VA
- Average rainfall in May: 3.15"
The wettest month (with the highest rainfall) is August (3.74").
The driest month (with the least rainfall) is September (1.89").
Average rainfall days in May
Chantilly, VA
- Average rainfall days in May: 17.5 days
The month with the highest number of rainy days is May (17.5 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in May
Chantilly, VA
- Average snowfall in May: 0"
The month with the highest snowfall is January (3.58").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in May
Chantilly, VA
- Average snowfall days in May: 0 days
The month with the highest number of snowfall days is February (5.3 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
Chantilly, VA
- 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: 8h and 48min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 6min).
Average sunshine days in May
Chantilly, VA
- Average sunshine days in May: 12.2 days
The month with the most sunshine days is November (19.6 days).
The month with the least sunshine days is July (12.1 days).
Average UV index in May
Chantilly, 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, February, November and December (UV index 2).
Average cloud cover in May
Chantilly, VA
- Average cloud cover in May: 44
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in May
Chantilly, VA
- Average visibility in May: 5mi
The months with the highest visibility are February, March, April, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January and May (5mi).
