December weather forecastGlen Lyn, VA
December
Weather in December
The first month of the winter, December, is also a frosty month in Glen Lyn, Virginia, with an average temperature fluctuating between 30°F (-1.1°C) and 43.7°F (6.5°C).Temperature
With the commencement of December, Glen Lyn records a moderate temperature decline, with the average high easing from November's cool 51.8°F (11°C) to a chilly 43.7°F (6.5°C). During the month of December, the nighttime temperature in Glen Lyn, Virginia, falls to an average of 30°F (-1.1°C).Humidity
February and December, with an average relative humidity of 81%, are the most humid months.Rainfall
In Glen Lyn, in December, it is raining for 10.7 days, with typically 1.97" (50mm) of accumulated precipitation. Throughout the year, in Glen Lyn, there are 158.3 rainfall days, and 23.5" (597mm) of precipitation is accumulated.Snowfall
January through May, October through December are months with snowfall. In December, in Glen Lyn, Virginia, it is snowing for 3.9 days. Throughout December, 2.36" (60mm) of snow is accumulated. Throughout the year, there are 26.7 snowfall days, and 13.46" (342mm) 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 7:19 am and sunset at 5:05 pm. On the last day of the month, sunrise is at 7:37 am and sunset at 5:15 pm EST.
Sunshine
In Glen Lyn, the average sunshine in December is 4.9h.UV index
The months with the lowest UV index are January, February, November and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a low health risk from exposure to the Sun's UV rays for the ordinary person.Note: A typical high UV index of 2 in December suggests the following recommendations:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. It's crucial to reduce time in the direct Sun around mid-day due to the intense solar radiation. To best shield against UV radiation, choose sun-safe garments and dependable sunglasses. Alert! The snow's reflection can amplify the UV radiation of the Sun nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Glen Lyn, VA
- Average high temperature in December: 43.7°F
The warmest month (with the highest average high temperature) is July (82.4°F).
The month with the lowest average high temperature is January (38.1°F).
- Average low temperature in December: 30°F
The month with the highest average low temperature is July (59.4°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).
Average pressure in December
Glen Lyn, 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
Glen Lyn, VA
- Average wind speed in December: 6.6mph
The windiest months (with the highest average wind speed) are January and February (7.5mph).
The calmest month (with the lowest average wind speed) is August (4mph).
Average humidity in December
Glen Lyn, VA
- Average humidity in December: 81%
The months with the highest relative humidity are February and December (81%).
The months with the lowest relative humidity are June, July and November (77%).
Average rainfall in December
Glen Lyn, VA
- Average rainfall in December: 1.97"
The wettest month (with the highest rainfall) is May (2.8").
The driest month (with the least rainfall) is September (1.34").
Average rainfall days in December
Glen Lyn, VA
- Average rainfall days in December: 10.7 days
The month with the highest number of rainy days is May (17.8 days).
The month with the least rainy days is October (8.8 days).
Average snowfall in December
Glen Lyn, VA
- Average snowfall in December: 2.36"
The month with the highest snowfall is January (3.43").
The months with the least snowfall are June, July, August and September (0").
Average snowfall days in December
Glen Lyn, VA
- Average snowfall days in December: 3.9 days
The month with the highest number of snowfall days is February (7.8 days).
The months with the least snowfall days are June, July, August and September (0 days).
Average daylight in December /
Average sunshine in December
Glen Lyn, VA
- Average daylight in December: 9h and 36min
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: 4h and 54min
The months with the most sunshine are June and July (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).
Average sunshine days in December
Glen Lyn, VA
- Average sunshine days in December: 17.8 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is May (10.7 days).
Average UV index in December
Glen Lyn, VA
- Average UV index in December: 2
The months with the highest UV index are June 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
Glen Lyn, VA
- Average cloud cover in December: 53
The months with the most cloud cover are January and February (Cloud cover 56).
The months with the least cloud cover are June and July (Cloud cover 38).
Average visibility in December
Glen Lyn, 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).
