December weather forecastUnionville, VA
December
Weather in December
December, the first month of the winter in Unionville, is still a chilly month, with an average temperature fluctuating between 32.7°F (0.4°C) and 46.4°F (8°C).Temperature
Unionville observes a small decrease in the average high-temperature with the arrival of December, falling from November's fresh 54.5°F (12.5°C) to a chilly 46.4°F (8°C). Throughout December nights, Unionville registers an average low-temperature of 32.7°F (0.4°C).Humidity
December is the most humid month in Unionville, with an average relative humidity of 78%.Rainfall
In Unionville, in December, it is raining for 10.7 days, with typically 2.56" (65mm) of accumulated precipitation. Throughout the year, there are 158.3 rainfall days, and 28.5" (724mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Unionville, in December, during 2.4 snowfall days, 1.77" (45mm) of snow is typically accumulated. In Unionville, during the entire year, snow falls for 16.2 days and aggregates up to 10.75" (273mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 36min of daylight.On the first day of the month, sunrise is at 7:10 am and sunset at 4:51 pm. On the last day of December, sunrise is at 7:28 am and sunset at 5:01 pm EST.
Sunshine
With an average of 5.3h of sunshine, December has the least sunshine of the year in Unionville.UV index
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: The maximum UV index of 2 during December leads to these instructions:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. The mid-day Sun emits the most powerful UV radiation, so seek shade and minimize exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Unionville, VA
- Average high temperature in December: 46.4°F
The warmest month (with the highest average high temperature) is July (88.3°F).
The month with the lowest average high temperature is January (41.5°F).
- Average low temperature in December: 32.7°F
The month with the highest average low temperature is July (66°F).
The coldest month (with the lowest average low temperature) is January (26.4°F).
Average pressure in December
Unionville, VA
- Average pressure in December: 30.12"Hg
The month with the highest atmospheric pressure is November (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.96"Hg).
Average wind speed in December
Unionville, VA
- Average wind speed in December: 5.4mph
The windiest month (with the highest average wind speed) is April (6.7mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).
Average humidity in December
Unionville, VA
- Average humidity in December: 78%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is July (71%).
Average rainfall in December
Unionville, VA
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is April (2.95").
The driest months (with the least rainfall) are January and September (1.85").
Average rainfall days in December
Unionville, VA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is May (17.1 days).
The month with the least rainy days is November (9.1 days).
Average snowfall in December
Unionville, VA
- Average snowfall in December: 1.77"
The month with the highest snowfall is January (2.99").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Unionville, VA
- Average snowfall days in December: 2.4 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
Unionville, VA
- Average daylight in December: 9h and 36min
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 36min).
- Average sunshine in December: 5h and 18min
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 18min).
Average sunshine days in December
Unionville, VA
- Average sunshine days in December: 18.2 days
The month with the most sunshine days is November (19.5 days).
The month with the least sunshine days is May (11.7 days).
Average UV index in December
Unionville, 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
Unionville, VA
- Average cloud cover in December: 42
The month with the most cloud cover is March (Cloud cover 45).
The month with the least cloud cover is July (Cloud cover 30).
Average visibility in December
Unionville, VA
- Average visibility in December: 6mi
The months with the highest visibility are February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are January, May and September (5mi).
