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 onset introduces a mild reduction in the average high-temperature, from a fresh 53.4°F (11.9°C) in November to a frosty 45.3°F (7.4°C). Reston observes an average low-temperature of 32.7°F (0.4°C) during December nights.Humidity
The months with the highest humidity are October and December, with an average relative humidity of 76%.Rainfall
In Reston, Virginia, in December, it is raining for 9.8 days, with typically 2.17" (55mm) of accumulated precipitation. In Reston, during the entire year, the rain falls for 152.8 days and collects up to 27.64" (702mm) of precipitation.Snowfall
January through April, November and December are months with snowfall. In Reston, in December, snow falls for 2.2 days, with typically accumulated 1.22" (31mm) of snow. In Reston, during the entire year, snow falls for 13.9 days and aggregates up to 7.2" (183mm) of snow.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December in Reston, sunrise is at 7:09 am and sunset at 4:47 pm. On the last day of the month, sunrise is at 7:28 am and sunset at 4:57 pm EST.
Sunshine
The months with the least sunshine are January, February and December, with an average of 5h 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 Reston. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: A daily maximum UV index of 2 in December translates into the following instructions:
In contrast to children, who must always be shielded from the sun, most people can tolerate up to an hour of sun exposure without any burns. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. Arm yourself against UV rays' harm with protective apparel and UV-filtering shades. Take into account! The reflection from snow can nearly double the Sun's UV radiation intensity.
Frequently asked questions
What is the average December temperature in Reston?
What are the most humid months in Reston?
What is the average humidity in December in Reston?
How much does it rain in Reston in December?
How many days does it snow in December in Reston?
What is the month with the shortest days in Reston?
How many hours of daylight does Reston have in December?
When is the sunrise / sunset in December in Reston?
What is the month with the least sunshine in Reston?
How many hours of sunshine does Reston have in December?
When is the lowest UV index in Reston?
How high is the UV index in December in Reston?
Average temperature in December
Reston, VA
- Average high temperature in December: 45.3°F
The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (39.7°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is July (68.5°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Reston, 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
Reston, VA
- Average wind speed in December: 6.8mph
The windiest month (with the highest average wind speed) is March (7.7mph).
The calmest month (with the lowest average wind speed) is August (4.9mph).
Average humidity in December
Reston, VA
- Average humidity in December: 76%
The months with the highest relative humidity are October and December (76%).
The month with the lowest relative humidity is July (69%).
Average rainfall in December
Reston, VA
- Average rainfall in December: 2.17"
The wettest month (with the highest rainfall) is August (3.39").
The driest month (with the least rainfall) is January (1.77").
Average rainfall days in December
Reston, VA
- Average rainfall days in December: 9.8 days
The month with the highest number of rainy days is May (16.3 days).
The month with the least rainy days is November (9.3 days).
Average snowfall in December
Reston, VA
- Average snowfall in December: 1.22"
The month with the highest snowfall is January (2.28").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Reston, VA
- Average snowfall days in December: 2.2 days
The month with the highest number of snowfall days is January (4.6 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
Reston, 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 0min
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 0min).
Average sunshine days in December
Reston, VA
- Average sunshine days in December: 17.9 days
The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (12.8 days).
Average UV index in December
Reston, 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
Reston, 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
Reston, VA
- Average visibility in December: 6mi
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).
Reston, Virginia, USA
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