December weather forecastMerrifield, VA
December
Weather in December
December, the first month of the winter in Merrifield, is also a frosty month, with an average temperature fluctuating between 33.1°F (0.6°C) and 45.5°F (7.5°C).Temperature
A decrease in the average high-temperature is observed during December, shifting from a cool 54.5°F (12.5°C) in November to a chilly 45.5°F (7.5°C). December witnesses an average nighttime temperature of 33.1°F (0.6°C) in Merrifield.Humidity
The average relative humidity in December in Merrifield is 76%.Rainfall
In December, in Merrifield, the rain falls for 10.8 days. Throughout December, 2.68" (68mm) of precipitation is accumulated. In Merrifield, during the entire year, the rain falls for 161.2 days and collects up to 31.54" (801mm) of precipitation.Snowfall
Months with snowfall are January through April, November and December. In December, it is snowing for 2.6 days. Throughout December, 1.73" (44mm) of snow is accumulated. Throughout the year, in Merrifield, Virginia, there are 16.1 snowfall days, and 10.39" (264mm) of snow is accumulated.Daylight
With an average of 9h and 30min of daylight, December has the shortest days of the year.On the first day of the month, sunrise is at 7:09 am and sunset at 4:47 pm. On the last day of December, in Merrifield, sunrise is at 7:27 am and sunset at 4:57 pm EST.
Sunshine
January, February and December, with an average of 5.2h of sunshine, are months with the least sunshine in Merrifield.UV index
The months with the lowest UV index are January, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.Note: The daily high UV index of 2 in December translates into this advice:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Solar radiation is at its peak intensity during midday, so it's advisable to stay indoors or in the shade. Stay sun-safe with clothing that is both closely woven and worn loosely. Be careful! The Sun's UV radiation can nearly be doubled by the reflective quality of snow.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Merrifield, VA
- Average high temperature in December: 45.5°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 (40.5°F).
- Average low temperature in December: 33.1°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 (27.1°F).
Average pressure in December
Merrifield, 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
Merrifield, VA
- Average wind speed in December: 6.6mph
The windiest month (with the highest average wind speed) is March (7.6mph).
The calmest month (with the lowest average wind speed) is August (4.8mph).
Average humidity in December
Merrifield, VA
- Average humidity in December: 76%
The month with the highest relative humidity is October (77%).
The months with the lowest relative humidity are April and July (71%).
Average rainfall in December
Merrifield, VA
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is August (3.78").
The driest month (with the least rainfall) is January (2.05").
Average rainfall days in December
Merrifield, VA
- Average rainfall days in December: 10.8 days
The month with the highest number of rainy days is May (18.2 days).
The month with the least rainy days is November (8.9 days).
Average snowfall in December
Merrifield, VA
- Average snowfall in December: 1.73"
The month with the highest snowfall is January (3.31").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Merrifield, VA
- Average snowfall days in December: 2.6 days
The month with the highest number of snowfall days is January (4.9 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
Merrifield, 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 54min).
The months with the least sunshine are January, February and December (Average sunshine: 5h and 12min).
Average sunshine days in December
Merrifield, VA
- Average sunshine days in December: 17.4 days
The month with the most sunshine days is November (19.2 days).
The month with the least sunshine days is July (10.9 days).
Average UV index in December
Merrifield, 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, November and December (UV index 2).
Average cloud cover in December
Merrifield, VA
- 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 30).
Average visibility in December
Merrifield, 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).
