December weather forecast
Castleton, VA

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Weather in December

The first month of the winter, December, is still a chilly month in Castleton, Virginia, with an average temperature fluctuating between 31.8°F (-0.1°C) and 46.4°F (8°C).

Temperature

The onset of December is marked by a minor decrease in temperature, transitioning from a cool 54.1°F (12.3°C) in November to a chilly 46.4°F (8°C). During December, Castleton experiences an average low-temperature of 31.8°F (-0.1°C) at night.

Humidity

The months with the highest humidity in Castleton are October and December, with an average relative humidity of 77%.

Rainfall

In December, the rain falls for 9.6 days. Throughout December, 2.17" (55mm) of precipitation is accumulated. In Castleton, during the entire year, the rain falls for 144.4 days and collects up to 25.08" (637mm) of precipitation.

Snowfall

Months with snowfall are January through May, November and December. In Castleton, in December, snow falls for 2.3 days, with typically accumulated 1.69" (43mm) of snow. In Castleton, during the entire year, snow falls for 15.4 days and aggregates up to 9.17" (233mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:11 am and sunset at 4:51 pm. On the last day of December, sunrise is at 7:30 am and sunset at 5:01 pm EST.

Sunshine

The month with the least sunshine is December, with an average of 5.2h of sunshine.

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 estimate of 2, and below, represents a low health risk from unsafe exposure to UV radiation for the average person.
Note: In December, the maximum UV index of 2 suggests these recommendations:
For the majority, extended sun exposure is not of great concern. Infants and people with sensitive skin must always be protected. Midday Sun has the strongest UV rays, making it crucial to limit exposure and find shade. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Be aware! The reflective nature of snow can magnify the Sun's UV radiation almost twofold.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What is the average December temperature?

In December, the average high-temperature and low-temperature are 46.4°F (8°C) and 31.8°F (-0.1°C) respectively. The average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which combines air temperature and relative humidity, in August is computed to be 95°F (35°C).

What are the most humid months?

October and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December?

In December, the average relative humidity is 77%.

How much does it rain in December?

In Castleton, during December, the rain falls for 9.6 days and regularly aggregates up to 2.17" (55mm) of precipitation.

How many days does it snow in December?

In Castleton, during December, snow falls for 2.3 days and regularly aggregates up to 1.69" (43mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 30min of daylight.

How many hours of daylight does Castleton have in December?

The average day length in December is 9h and 31min.

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:11 am and sunset at 4:51 pm. On the last day of the month, sunrise is at 7:30 am and sunset at 5:01 pm EST.

What is the month with the least sunshine?

The month with the least sunshine is December, with an average of 5.2h of sunshine.

How long on average sun shines in December?

In December, the average sunshine duration is 5.2h.

What is the month with the lowest UV index?

The months with the lowest UV index in Castleton are January, February, November and December, with an average maximum UV index of 2.

What is the UV index intensity in December?

In Castleton, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes 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
Castleton, VA

Average temperature in December - Castleton, VA
  • Average high temperature in December: 46.4°F

The warmest month (with the highest average high temperature) is July (87.6°F).
The month with the lowest average high temperature is January (41.4°F).

  • Average low temperature in December: 31.8°F

The month with the highest average low temperature is July (65.5°F).
The coldest month (with the lowest average low temperature) is January (26.1°F).

Average pressure in December
Castleton, VA

Average pressure in December - Castleton, VA
  • Average pressure in December: 30.11"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
Castleton, VA

Average wind speed in December - Castleton, VA
  • Average wind speed in December: 5.5mph

The windiest month (with the highest average wind speed) is April (6.9mph).
The calmest month (with the lowest average wind speed) is August (4.6mph).

Average humidity in December
Castleton, VA

Average humidity in December - Castleton, VA
  • Average humidity in December: 77%

The months with the highest relative humidity are October and December (77%).
The month with the lowest relative humidity is July (72%).

Average rainfall in December
Castleton, VA

Average rainfall in December - Castleton, VA
  • Average rainfall in December: 2.17"

The wettest month (with the highest rainfall) is May (2.68").
The driest month (with the least rainfall) is February (1.46").

Average rainfall days in December
Castleton, VA

Average rainfall days in December - Castleton, VA
  • Average rainfall days in December: 9.6 days

The month with the highest number of rainy days is May (16.1 days).
The months with the least rainy days are January and November (8.3 days).

Average snowfall in December
Castleton, VA

Average snowfall in December - Castleton, VA
  • Average snowfall in December: 1.69"

The month with the highest snowfall is January (2.36").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Castleton, VA

Average snowfall days in December - Castleton, VA
  • Average snowfall days in December: 2.3 days

The months with the highest number of snowfall days are January and February (4.8 days).
The months with the least snowfall days are June, July, August, September and October (0 days).

Average daylight in December /
Average sunshine in December
Castleton, VA

Average daylight in December / Average sunshine in December - Castleton, VA
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 12min).

Average sunshine days in December
Castleton, VA

Average sunshine days in December - Castleton, VA
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is November (20.5 days).
The month with the least sunshine days is May (12.5 days).

Average UV index in December
Castleton, VA

Average UV index in December - Castleton, 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, February, November and December (UV index 2).

Average cloud cover in December
Castleton, VA

Average cloud cover in December - Castleton, VA
  • Average cloud cover in December: 44

The month with the most cloud cover is March (Cloud cover 46).
The month with the least cloud cover is July (Cloud cover 31).

Average visibility in December
Castleton, VA

Average visibility in December - Castleton, VA
  • Average visibility in December: 6mi

The months with the highest visibility are January, February, March, April, June, July, August, October, November and December (6mi).
The months with the lowest visibility are May and September (5mi).

Castleton, Virginia, USA

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