December weather forecastAlexandria, VA
December
Weather in December
December rings in the winter season in Alexandria, marked by a significant cool down from November. The temperature varies from 34°F (1.1°C) to 46.2°F (7.9°C), adding a cold air to the city's festive mood. The shorter days and longer nights complement the Christmas spirit. Mild snowfall adds to the seasonal charm while cloudy conditions are prevalent. As January approaches, prepare for the colder winter peak that awaits.Temperature
With the arrival of December, Alexandria notices a mild change in the average high-temperature, sliding from November's fresh 55°F (12.8°C) to a chilly 46.2°F (7.9°C). Alexandria reports an average nighttime low-temperature of 34°F (1.1°C) in December.Humidity
The months with the highest humidity are May, October and December, with an average relative humidity of 76%.Rainfall
In Alexandria, in December, it is raining for 10.6 days, with typically 2.68" (68mm) of accumulated precipitation. Throughout the year, in Alexandria, there are 158.2 rainfall days, and 30.67" (779mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Alexandria, during December, snow falls for 2.5 days and regularly aggregates up to 1.02" (26mm) of snow. Throughout the year, in Alexandria, there are 14.4 snowfall days, and 7.56" (192mm) of snow is accumulated.Ocean temperature
In Alexandria, Virginia, in December, the average water temperature is 51.4°F (10.8°C).Note: Diving into 51.4°F (10.8°C) when it's under 50°F (10°C) can cause immediate cold shock symptoms, marked by hyperventilation.
Daylight
December has the shortest days of the year in Alexandria, with an average of 9h and 30min of daylight.On the first day of the month, sunrise is at 7:08 am and sunset at 4:46 pm. On the last day of December, sunrise is at 7:26 am and sunset at 4:56 pm EST.
Sunshine
In Alexandria, the average sunshine in December is 5.2h.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index reading of 2, and below, represents a minimal health vulnerability from unprotected exposure to Sun's UV rays for the ordinary person.Note: The daily maximum UV index of 2 in December interprets into the following advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. To avoid the Sun's strongest rays, limit exposure around the mid-day period. Select sunglasses that boast both UVA and UVB protection to limit the adverse effects of the sun on the eyes. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Alexandria, VA
- Average high temperature in December: 46.2°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 December: 34°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 December
Alexandria, 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
Alexandria, VA
- Average wind speed in December: 6.8mph
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 December
Alexandria, VA
- Average humidity in December: 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 December
Alexandria, VA
- Average rainfall in December: 2.68"
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 December
Alexandria, VA
- Average rainfall days in December: 10.6 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 December
Alexandria, VA
- Average snowfall in December: 1.02"
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 December
Alexandria, VA
- Average snowfall days in December: 2.5 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 sea temperature in December
Alexandria, VA
- Average sea temperature in December: 51.3°F
The best month for swimming (with the highest average sea temperature) is August (78°F).
The coldest month (with the lowest average sea temperature) is February (45.2°F).
Average daylight in December /
Average sunshine in December
Alexandria, 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 12min
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 December
Alexandria, VA
- Average sunshine days in December: 17.4 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 December
Alexandria, 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 and December (UV index 2).
Average cloud cover in December
Alexandria, 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 30).
Average visibility in December
Alexandria, 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).
