December weather forecastWashington, VA
December
Weather in December
The first month of the winter, December, is also a frosty month in Washington, Virginia, with an average temperature fluctuating between 30°F (-1.1°C) and 43.7°F (6.5°C).Temperature
December indicates a minor shift in the average high-temperature, from November's cool 52.5°F (11.4°C) to a chilly 43.7°F (6.5°C). Washington experiences an average temperature drop to a freezing cold 30°F (-1.1°C) during December nights.Humidity
In Washington, the average relative humidity in December is 78%.Rainfall
In Washington, in December, during 8.5 rainfall days, 1.46" (37mm) of precipitation is typically accumulated. In Washington, Virginia, during the entire year, the rain falls for 146.8 days and collects up to 21.02" (534mm) of precipitation.Snowfall
Months with snowfall are January through May, October through December. In Washington, in December, during 2.8 snowfall days, 1.89" (48mm) of snow is typically accumulated. Throughout the year, there are 17.4 snowfall days, and 9.72" (247mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 30min of daylight.On the first day of December, sunrise is at 7:12 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:01 pm EST.
Sunshine
December has the least sunshine of the year, with an average of 5.1h of sunshine.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the average person.Note: In December, a regular UV index of 2 translates into these guidelines:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. For skin protection, it's recommended to minimize Sun exposure during its peak hours around midday. Safeguard your eyes, ears, and face from sun rays with the aid of a wide-brim hat. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Washington, VA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (85.6°F).
The month with the lowest average high temperature is January (38.7°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (62.6°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).
Average pressure in December
Washington, 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
Washington, VA
- Average wind speed in December: 5.8mph
The windiest months (with the highest average wind speed) are February and March (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.1mph).
Average humidity in December
Washington, VA
- Average humidity in December: 78%
The month with the highest relative humidity is October (79%).
The months with the lowest relative humidity are April and July (74%).
Average rainfall in December
Washington, VA
- Average rainfall in December: 1.46"
The wettest month (with the highest rainfall) is May (2.64").
The driest month (with the least rainfall) is January (0.94").
Average rainfall days in December
Washington, VA
- Average rainfall days in December: 8.5 days
The month with the highest number of rainy days is August (17.8 days).
The month with the least rainy days is January (6.8 days).
Average snowfall in December
Washington, VA
- Average snowfall in December: 1.89"
The month with the highest snowfall is March (2.56").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Washington, VA
- Average snowfall days in December: 2.8 days
The month with the highest number of snowfall days is January (5 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Washington, VA
- Average daylight in December: 9h and 30min
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 December: 5h and 6min
The month with the most sunshine is July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Washington, VA
- Average sunshine days in December: 20.1 days
The month with the most sunshine days is November (20.9 days).
The month with the least sunshine days is August (11.4 days).
Average UV index in December
Washington, 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
Washington, VA
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).
Average visibility in December
Washington, VA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, April, June, July, August and November (6mi).
The months with the lowest visibility are March, May, September, October and December (5mi).
