December weather forecastVienna, MD
December
Weather in December
The first month of the winter, December, is still a chilly month in Vienna, Maryland, with an average temperature varying between 36.1°F (2.3°C) and 47.7°F (8.7°C).Temperature
December's arrival subtly correlates with a reduction in the average high-temperature, down from a moderate 55.8°F (13.2°C) in November to a chilly 47.7°F (8.7°C). Vienna experiences an average low-temperature of 36.1°F (2.3°C) in month of December.Humidity
In December, the average relative humidity is 78%.Rainfall
In Vienna, Maryland, during December, the rain falls for 7.8 days and regularly aggregates up to 0.87" (22mm) of precipitation. Throughout the year, there are 114.4 rainfall days, and 12.05" (306mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Vienna, during December, snow falls for 1.7 days and regularly aggregates up to 0.28" (7mm) of snow. Throughout the year, there are 10 snowfall days, and 1.81" (46mm) 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 7:02 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:52 pm EST.
Sunshine
The months with the least sunshine are February and December, with an average of 5.1h of sunshine.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index of 2, and less, symbolizes a minimal health hazard from exposure to the Sun's UV radiation for the ordinary person.Note: The UV index of 2 in December translates into these instructions:
Babies, children, and individuals with sensitive skin should always have protection against extended sun exposure. Being in direct Sun during midday can be harmful due to intense solar radiation; take precautions. It's wise to wear UVA and UVB-blocking sunglasses when the sun shines brightly. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Vienna, MD
- Average high temperature in December: 47.7°F
The warmest month (with the highest average high temperature) is July (84.4°F).
The month with the lowest average high temperature is January (42.1°F).
- Average low temperature in December: 36.1°F
The month with the highest average low temperature is July (70.2°F).
The coldest month (with the lowest average low temperature) is January (29.5°F).
Average pressure in December
Vienna, MD
- Average pressure in December: 30.1"Hg
The month with the highest atmospheric pressure is November (30.12"Hg).
The month with the lowest atmospheric pressure is June (29.94"Hg).
Average wind speed in December
Vienna, MD
- Average wind speed in December: 8.6mph
The windiest month (with the highest average wind speed) is February (9.7mph).
The calmest month (with the lowest average wind speed) is August (6.1mph).
Average humidity in December
Vienna, MD
- Average humidity in December: 78%
The months with the highest relative humidity are May, August and September (80%).
The months with the lowest relative humidity are January, February, March and April (75%).
Average rainfall in December
Vienna, MD
- Average rainfall in December: 0.87"
The wettest month (with the highest rainfall) is July (1.46").
The driest months (with the least rainfall) are April and May (0.79").
Average rainfall days in December
Vienna, MD
- Average rainfall days in December: 7.8 days
The month with the highest number of rainy days is July (13.2 days).
The month with the least rainy days is November (6.5 days).
Average snowfall in December
Vienna, MD
- Average snowfall in December: 0.28"
The month with the highest snowfall is January (0.75").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Vienna, MD
- Average snowfall days in December: 1.7 days
The month with the highest number of snowfall days is January (3.2 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
Vienna, MD
- 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 months with the least sunshine are February and December (Average sunshine: 5h and 6min).
Average sunshine days in December
Vienna, MD
- Average sunshine days in December: 20.8 days
The month with the most sunshine days is November (21.2 days).
The month with the least sunshine days is July (14.7 days).
Average UV index in December
Vienna, MD
- 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
Vienna, MD
- Average cloud cover in December: 44
The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 28).
Average visibility in December
Vienna, MD
- Average visibility in December: 6mi
The months with the highest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
The months with the lowest visibility are January, February, March, April, May, June, July, August, September, October, November and December (6mi).
