December weather forecastMountcastle, VA
December
Weather in December
December, the first month of the winter in Mountcastle, is still a cool month, with an average temperature ranging between min 35.8°F (2.1°C) and max 50.2°F (10.1°C).Temperature
December's arrival comes with a mild decrease in the average high-temperature, moving subtly from a refreshing 57.7°F (14.3°C) in November to a cool 50.2°F (10.1°C). Nighttime temperature lowers to an average of 35.8°F (2.1°C) in December.Humidity
December is the most humid month, with an average relative humidity of 79%.Rainfall
In Mountcastle, during December, the rain falls for 11.5 days and regularly aggregates up to 2.56" (65mm) of precipitation. Throughout the year, there are 166.1 rainfall days, and 33.27" (845mm) of precipitation is accumulated.Snowfall
January through April, November and December are months with snowfall. In Mountcastle, in December, snow falls for 1.5 days, with typically accumulated 0.91" (23mm) of snow. Throughout the year, there are 10.3 snowfall days, and 5.71" (145mm) of snow is accumulated.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 7:04 am and sunset at 4:50 pm. On the last day of December, in Mountcastle, sunrise is at 7:22 am and sunset at 5:00 pm EST.
Sunshine
In December, the average sunshine is 5.3h.UV index
January 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 minimal health hazard from unsafe exposure to UV radiation for ordinary individuals.Note: In December, the maximum UV index of 2 suggests this advice:
Though extended exposure to the sun typically does not concern most people, it is crucial to always shield children, infants, and those with sensitive skin. Limiting exposure to the direct Sun during midday hours can help prevent harmful UV radiation effects. In bright sunlight, prioritize sunglasses that grant protection from UVA and UVB radiation. Be mindful! The reflection from snow can increase the Sun's UV radiation nearly twice.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Mountcastle, VA
- Average high temperature in December: 50.2°F
The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (45.1°F).
- Average low temperature in December: 35.8°F
The month with the highest average low temperature is July (69.4°F).
The coldest month (with the lowest average low temperature) is January (30.2°F).
Average pressure in December
Mountcastle, 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
Mountcastle, VA
- Average wind speed in December: 6.1mph
The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest month (with the lowest average wind speed) is August (5.3mph).
Average humidity in December
Mountcastle, VA
- Average humidity in December: 79%
The month with the highest relative humidity is December (79%).
The month with the lowest relative humidity is July (73%).
Average rainfall in December
Mountcastle, VA
- Average rainfall in December: 2.56"
The wettest month (with the highest rainfall) is August (3.7").
The driest month (with the least rainfall) is September (2.01").
Average rainfall days in December
Mountcastle, VA
- Average rainfall days in December: 11.5 days
The month with the highest number of rainy days is May (18.4 days).
The months with the least rainy days are January and November (10.2 days).
Average snowfall in December
Mountcastle, VA
- Average snowfall in December: 0.91"
The month with the highest snowfall is February (1.57").
The months with the least snowfall are May, June, July, August, September and October (0").
Average snowfall days in December
Mountcastle, VA
- Average snowfall days in December: 1.5 days
The month with the highest number of snowfall days is February (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
Mountcastle, 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: 5h and 18min
The month with the most sunshine is July (Average sunshine: 10h and 24min).
The month with the least sunshine is February (Average sunshine: 5h and 12min).
Average sunshine days in December
Mountcastle, VA
- Average sunshine days in December: 17.6 days
The month with the most sunshine days is November (18.6 days).
The month with the least sunshine days is May (10.9 days).
Average UV index in December
Mountcastle, 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 and December (UV index 2).
Average cloud cover in December
Mountcastle, VA
- Average cloud cover in December: 43
The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 33).
Average visibility in December
Mountcastle, 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).
