Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
December's arrival coincides with a soft drop in the average high-temperature, subtly decreasing from November's fresh 53.6°F (12°C) to a frosty 45.3°F (7.4°C). Chantilly, during the nights of December, experiences an average temperature drop to an icy 32.2°F (0.1°C).Humidity
The months with the highest humidity in Chantilly, Virginia, are October and December, with an average relative humidity of 77%.Rainfall
In December, the rain falls for 10.4 days. Throughout December, 2.68" (68mm) of precipitation is accumulated. In Chantilly, during the entire year, the rain falls for 156 days and collects up to 31.18" (792mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Chantilly, during December, snow falls for 2.7 days and regularly aggregates up to 1.97" (50mm) of snow. In Chantilly, during the entire year, snow falls for 16.8 days and aggregates up to 12.48" (317mm) of snow.Daylight
The month with the shortest days in Chantilly, Virginia, is December, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:09 am and sunset at 4:48 pm. On the last day of December, sunrise is at 7:28 am and sunset at 4:57 pm EST.
Sunshine
The months with the least sunshine in Chantilly are January, February and December, with an average of 5.1h of sunshine.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Chantilly. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the average person.Note: The daily high UV index of 2 during December translates into the following recommendations:
Apart from children, who require continuous protection, most can endure sun exposure for up to an hour without experiencing burns. Minimize direct exposure to the Sun during midday when its radiation is at its peak. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Frequently asked questions
What is the temperature in December in Chantilly?
What are the most humid months in Chantilly?
What is the average humidity in December in Chantilly?
How much does it rain in Chantilly in December?
How many days does it snow in December in Chantilly?
What is the month with the shortest days in Chantilly?
What is the average length of the day in December in Chantilly?
When is the sunrise / sunset in December in Chantilly?
What are the months with the least sunshine in Chantilly?
How many hours of sunshine does Chantilly have in December?
What is the month with the lowest UV index in Chantilly?
What is the UV index reading in December in Chantilly?
Average temperature in December
Chantilly, VA
- Average high temperature in December: 45.3°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 December: 32.2°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 December
Chantilly, VA
- Average pressure in December: 30.11"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 December
Chantilly, VA
- Average wind speed in December: 6.5mph
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 December
Chantilly, VA
- Average humidity in December: 77%
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 December
Chantilly, VA
- Average rainfall in December: 2.68"
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 December
Chantilly, VA
- Average rainfall days in December: 10.4 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 December
Chantilly, VA
- Average snowfall in December: 1.97"
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 December
Chantilly, VA
- Average snowfall days in December: 2.7 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 December /
Average sunshine in December
Chantilly, VA
- Average daylight in December: 9h and 3min
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 December: 5h and 1min
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 December
Chantilly, VA
- Average sunshine days in December: 17.8 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 December
Chantilly, VA
- Average UV index in December: 2
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 December
Chantilly, VA
- Average cloud cover in December: 46
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 December
Chantilly, VA
- Average visibility in December: 6mi
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).
Chantilly, Virginia, USA
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