December weather forecast
Herndon Heights, WV

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Weather in December

The first month of the winter, December, is also a frosty month in Herndon Heights, West Virginia, with an average temperature varying between 30.7°F (-0.7°C) and 43.5°F (6.4°C).

Temperature

As December commences, the average high-temperature subtly reduces, transitioning from a fresh 52°F (11.1°C) in November to a chilly 43.5°F (6.4°C). In Herndon Heights, the average temperature during the nights of December drops to a subzero cold 30.7°F (-0.7°C).

Humidity

In Herndon Heights, the average relative humidity in December is 81%.

Rainfall

In Herndon Heights, during December, the rain falls for 12.4 days and regularly aggregates up to 3.15" (80mm) of precipitation. Throughout the year, there are 180.7 rainfall days, and 32.24" (819mm) of precipitation is accumulated.

Snowfall

January through May, October through December are months with snowfall. In Herndon Heights, West Virginia, in December, snow falls for 10.5 days, with typically accumulated 5.55" (141mm) of snow. In Herndon Heights, during the entire year, snow falls for 50.3 days and aggregates up to 27.09" (688mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 36min of daylight.
On the first day of December, sunrise is at 7:21 am and sunset at 5:07 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:17 pm EST.

Sunshine

In Herndon Heights, the average sunshine in December is 4.6h.

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 reading of 2, and below, represents a low threat to health from exposure to the Sun's UV radiation for the average person.
Note: In December, the maximum UV index of 2 translates into these guidelines:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Updated: Aug 13, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

December temperatures vary between a high-temperature of 43.5°F (6.4°C) and a low-temperature of 30.7°F (-0.7°C). The average heat index (a.k.a. 'real feel', 'feels like'), which calculates the temperature value influenced by the moisture in the air, in August is computed to be 87.8°F (31°C).

What is the average humidity in December?

The average relative humidity in December is 81%.

How many days does it rain in December?

In Herndon Heights, in December, during 12.4 rainfall days, 3.15" (80mm) of precipitation is typically accumulated.

How much does it snow in December?

In Herndon Heights, during December, snow falls for 10.5 days and regularly aggregates up to 5.55" (141mm) 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.

What is the average length of the day in December in Herndon Heights?

The average day length in December is 9h and 38min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:21 am and sunset at 5:07 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:17 pm EST.

How long on average sun shines in December?

The average sunshine duration in December is 4.6h.

When is the lowest UV index?

January, February, November 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 December, the average daily maximum UV index is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability from unprotected exposure to UV radiation.
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
Herndon Heights, WV

Average temperature in December - Herndon Heights, WV
  • Average high temperature in December: 43.5°F

The warmest month (with the highest average high temperature) is July (82.8°F).
The month with the lowest average high temperature is January (38.3°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (60.1°F).
The coldest month (with the lowest average low temperature) is January (24.8°F).

Average pressure in December
Herndon Heights, WV

Average pressure in December - Herndon Heights, WV
  • 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
Herndon Heights, WV

Average wind speed in December - Herndon Heights, WV
  • Average wind speed in December: 6.6mph

The windiest month (with the highest average wind speed) is January (7.4mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity in December
Herndon Heights, WV

Average humidity in December - Herndon Heights, WV
  • Average humidity in December: 81%

The month with the highest relative humidity is February (83%).
The months with the lowest relative humidity are June, July, August and November (77%).

Average rainfall in December
Herndon Heights, WV

Average rainfall in December - Herndon Heights, WV
  • Average rainfall in December: 3.15"

The wettest months (with the highest rainfall) are February and May (3.43").
The driest month (with the least rainfall) is September (1.57").

Average rainfall days in December
Herndon Heights, WV

Average rainfall days in December - Herndon Heights, WV
  • Average rainfall days in December: 12.4 days

The month with the highest number of rainy days is May (20.1 days).
The month with the least rainy days is November (11.3 days).

Average snowfall in December
Herndon Heights, WV

Average snowfall in December - Herndon Heights, WV
  • Average snowfall in December: 5.55"

The month with the highest snowfall is February (6.02").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Herndon Heights, WV

Average snowfall days in December - Herndon Heights, WV
  • Average snowfall days in December: 10.5 days

The month with the highest number of snowfall days is January (13.1 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Herndon Heights, WV

Average daylight in December / Average sunshine in December - Herndon Heights, WV
  • 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: 4h and 4min

The month with the most sunshine is August (Average sunshine: 10h and 6min).
The month with the least sunshine is January (Average sunshine: 4h and 12min).

Average sunshine days in December
Herndon Heights, WV

Average sunshine days in December - Herndon Heights, WV
  • Average sunshine days in December: 11.7 days

The month with the most sunshine days is November (15.8 days).
The month with the least sunshine days is February (8.3 days).

Average UV index in December
Herndon Heights, WV

Average UV index in December - Herndon Heights, WV
  • 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
Herndon Heights, WV

Average cloud cover in December - Herndon Heights, WV
  • Average cloud cover in December: 57

The month with the most cloud cover is January (Cloud cover 62).
The month with the least cloud cover is August (Cloud cover 36).

Average visibility in December
Herndon Heights, WV

Average visibility in December - Herndon Heights, WV
  • Average visibility in December: 5mi

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

Herndon Heights, West Virginia, USA

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