December weather forecast
Mountcastle, VA

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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.

Frequently asked questions

What is the temperature in December in Mountcastle?

In Mountcastle, 50.2°F (10.1°C) is the average high-temperature and 35.8°F (2.1°C) is the average low-temperature during December. The average heat index (a.k.a. 'real feel', 'apparent temperature'), which factors the actual air temperature with the relative humidity, in September is computed to be 86°F (30°C).

What is the most humid month?

December is the most humid month, with an average relative humidity of 79%.

What is the average humidity in December?

In Mountcastle, the average relative humidity in December is 79%.

How many days does it rain in December?

In Mountcastle, during December, the rain falls for 11.5 days and regularly aggregates up to 2.56" (65mm) of precipitation.

How much does it snow in December?

In Mountcastle, during December, snow falls for 1.5 days and regularly aggregates up to 0.91" (23mm) of snow.

What is the month with the shortest days?

The month with the shortest days is December, with an average of 9h and 36min of daylight.

How many hours of daylight does Mountcastle have in December?

In December, the average day length is 9h and 38min.

When is the sunrise / sunset in December?

On the first day of December in Mountcastle, sunrise is at 7:04 am and sunset at 4:50 pm. On the last day of the month, sunrise is at 7:22 am and sunset at 5:00 pm EST.

How many hours of sunshine does Mountcastle have in December?

The average sunshine duration in December in Mountcastle is 5.3h.

What is the month with the lowest UV index?

January and December, with an average maximum UV index of 2, are months with the lowest UV index.

How high is the UV index in December?

In Mountcastle, the average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal hazard to health from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Mountcastle, VA

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 - 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 - 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 - 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 - 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 - 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 - 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 - 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 / Average sunshine in December - Mountcastle, 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 2min

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 - 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 - 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 - 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 - 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).

Mountcastle, Virginia, USA

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