Contents
- Weather in December
- Frequently asked questions
- Average temperature in December
- Average pressure in December
- Average wind speed in December
- Average humidity in December
- Average rainfall in December
- Average rainfall days in December
- Average snowfall in December
- Average snowfall days in December
- Average daylight in December
- Average sunshine in December
- Average sunshine days in December
- Average UV index in December
- Average cloud cover in December
- Average visibility in December
Weather in December
Temperature
The arrival of December corresponds with a light shift in temperature, down from a moderate 57°F (13.9°C) in November to a chilly 49.1°F (9.5°C). Mechanicsville experiences an average low-temperature reading of 35.1°F (1.7°C) throughout December.Humidity
The most humid month is December, with an average relative humidity of 78%.Rainfall
In Mechanicsville, during December, the rain falls for 10.9 days and regularly aggregates up to 2.52" (64mm) of precipitation. Throughout the year, there are 154.5 rainfall days, and 30.35" (771mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through April, November and December. In Mechanicsville, Virginia, in December, snow falls for 1.5 days, with typically accumulated 1.65" (42mm) of snow. Throughout the year, there are 10.1 snowfall days, and 7.2" (183mm) of snow is accumulated.Daylight
December has the shortest days of the year, with an average of 9h and 36min of daylight.On the first day of December, sunrise is at 7:06 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:24 am and sunset at 5:01 pm EST.
Sunshine
With an average of 5.1h of sunshine, December has the least sunshine of the year.UV index
The months with the lowest UV index are January and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the ordinary person.Note: In December, the maximum UV index of 2 transforms into these recommendations:
Those with sensitive skin, infants, and children require constant safeguarding from prolonged sun exposure. Avoiding direct sunlight during midday hours helps reduce the risk from intense UV radiation. Always opt for UVA and UVB-resistant sunglasses on radiant days. On your guard! Snow's reflection can almost double the intensity of the Sun's UV radiation.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What is the temperature in December?
What is the most humid month?
What is the average humidity in December?
How many days does it rain in December?
How much does it snow in December?
What is the month with the shortest days?
What is the average length of the day in December?
When is the sunrise / sunset in December?
What is the month with the least sunshine?
How many hours of sunshine does Mechanicsville have in December?
What are the months with the lowest UV index?
How high is the UV index in December?
Average temperature in December
Mechanicsville, VA
- Average high temperature in December: 49.1°F
The warmest month (with the highest average high temperature) is July (90.9°F).
The month with the lowest average high temperature is January (44.6°F).
- Average low temperature in December: 35.1°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 (29.7°F).
Average pressure in December
Mechanicsville, 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 (29.95"Hg).
Average wind speed in December
Mechanicsville, VA
- Average wind speed in December: 6mph
The windiest month (with the highest average wind speed) is April (7.5mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Mechanicsville, 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 (68%).
Average rainfall in December
Mechanicsville, VA
- Average rainfall in December: 2.52"
The wettest month (with the highest rainfall) is August (2.87").
The driest month (with the least rainfall) is September (1.73").
Average rainfall days in December
Mechanicsville, VA
- Average rainfall days in December: 10.9 days
The month with the highest number of rainy days is May (17 days).
The month with the least rainy days is November (9.7 days).
Average snowfall in December
Mechanicsville, VA
- Average snowfall in December: 1.65"
The month with the highest snowfall is January (2.05").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mechanicsville, VA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is January (3.3 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
Mechanicsville, VA
- Average daylight in December: 9h and 4min
The month with the longest days is June (Average daylight: 14h and 42min).
The month with the shortest days is December (Average daylight: 9h and 36min).
- Average sunshine in December: 5h and 1min
The month with the most sunshine is July (Average sunshine: 10h and 30min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).
Average sunshine days in December
Mechanicsville, VA
- Average sunshine days in December: 18.6 days
The month with the most sunshine days is October (19.5 days).
The month with the least sunshine days is May (12.1 days).
Average UV index in December
Mechanicsville, VA
- Average UV index in December: 2
The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).
Average cloud cover in December
Mechanicsville, VA
- Average cloud cover in December: 45
The month with the most cloud cover is March (Cloud cover 48).
The month with the least cloud cover is July (Cloud cover 32).
Average visibility in December
Mechanicsville, VA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, June, July, August, September, October and November (6mi).
The months with the lowest visibility are May and December (5mi).
Mechanicsville, Virginia, USA
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