December weather forecastRoberts Mill, VA
December
Weather in December
December, the first month of the winter in Roberts Mill, is also a frosty month, with an average temperature varying between 43.9°F (6.6°C) and 30.2°F (-1°C).Temperature
The arrival of December is marked by a minor reduction in average high-temperature, sliding from a fresh 51.8°F (11°C) in November to a frosty 43.9°F (6.6°C). Nighttime temperatures consistently average a subzero cold 30.2°F (-1°C) during December.Humidity
The average relative humidity in December is 80%.Rainfall
In Roberts Mill, in December, during 11.9 rainfall days, 2.68" (68mm) of precipitation is typically accumulated. Throughout the year, there are 191 rainfall days, and 30.87" (784mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through May, October through December. The month with the most snowfall is December, when snow falls for 7.2 days and typically aggregates up to 4.8" (122mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 42min of daylight.On the first day of the month, sunrise is at 7:20 am and sunset at 5:09 pm. On the last day of December, sunrise is at 7:38 am and sunset at 5:19 pm EST.
Sunshine
In Roberts Mill, the average sunshine in December is 4.9h.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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV rays for the average person.Note: A typical high UV index of 2 in December suggests the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. Experience reduced UV exposure by about half when donning a wide-brim hat. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Roberts Mill, VA
- Average high temperature in December: 43.9°F
The warmest month (with the highest average high temperature) is July (81°F).
The month with the lowest average high temperature is January (38.8°F).
- Average low temperature in December: 30.2°F
The month with the highest average low temperature is July (57.9°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).
Average pressure in December
Roberts Mill, VA
- Average pressure in December: 30.14"Hg
The month with the highest atmospheric pressure is November (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).
Average wind speed in December
Roberts Mill, VA
- Average wind speed in December: 7.3mph
The windiest months (with the highest average wind speed) are January and February (8.1mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).
Average humidity in December
Roberts Mill, VA
- Average humidity in December: 80%
The month with the highest relative humidity is February (81%).
The month with the lowest relative humidity is November (77%).
Average rainfall in December
Roberts Mill, VA
- Average rainfall in December: 2.68"
The wettest month (with the highest rainfall) is May (3.23").
The driest month (with the least rainfall) is September (1.77").
Average rainfall days in December
Roberts Mill, VA
- Average rainfall days in December: 11.9 days
The month with the highest number of rainy days is July (22 days).
The month with the least rainy days is November (10.8 days).
Average snowfall in December
Roberts Mill, VA
- Average snowfall in December: 4.8"
The month with the highest snowfall is December (4.8").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Roberts Mill, VA
- Average snowfall days in December: 7.2 days
The month with the highest number of snowfall days is January (9.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Roberts Mill, VA
- Average daylight in December: 9h and 42min
The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).
- Average sunshine in December: 4h and 54min
The month with the most sunshine is June (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).
Average sunshine days in December
Roberts Mill, VA
- Average sunshine days in December: 13.3 days
The month with the most sunshine days is November (15.6 days).
The month with the least sunshine days is May (6.7 days).
Average UV index in December
Roberts Mill, VA
- Average UV index in December: 2
The month with the highest UV index is 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
Roberts Mill, VA
- Average cloud cover in December: 55
The month with the most cloud cover is February (Cloud cover 59).
The months with the least cloud cover are June, July and August (Cloud cover 40).
Average visibility in December
Roberts Mill, VA
- Average visibility in December: 5mi
The months with the highest visibility are January, February, March, April, May, June, July, August, October, November and December (5mi).
The month with the lowest visibility is September (4mi).
