December weather forecast
Mason, WV

December

Weather in December

December, the first month of the winter in Mason, is still a chilly month, with an average temperature ranging between max 6.1°C and min -0.7°C.

Temperature

Onset of December comes with a temperature decline, the average high falling from a cool 11.3°C in November to a chilly 6.1°C. Throughout December, Mason experiences a low-temperature average of -0.7°C.

Humidity

The average relative humidity in December is 81%.

Rainfall

In December, in Mason, the rain falls for 12.9 days. Throughout December, 81mm of precipitation is accumulated. Throughout the year, there are 172.1 rainfall days, and 839mm of precipitation is accumulated.

Snowfall

January through April, October through December are months with snowfall. In December, in Mason, it is snowing for 8.5 days. Throughout December, 58mm of snow is accumulated. In Mason, during the entire year, snow falls for 40.2 days and aggregates up to 346mm of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:28 am and sunset at 5:06 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:15 pm EST.

Sunshine

In Mason, West Virginia, the average sunshine in December is 3.9h.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Mason. A UV Index reading of 2, and below, represents a minimal health hazard from unsafe exposure to UV radiation for the average person.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. The solar radiation around mid-day is intense; avoid the Sun and stay safe. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.

Frequently asked questions

How cold is December?
The average high-temperature and low-temperature during December are 6.1°C and -0.7°C respectively. In August, the average heat index (a.k.a. 'apparent temperature', 'real feel'), which combines relative humidity and air temperature, is evaluated at 35°C.
What is the average humidity in December?
In Mason, the average relative humidity in December is 81%.
How much does it rain in December?
In Mason, in December, it is raining for 12.9 days, with typically 81mm of accumulated precipitation.
How much does it snow in Mason in December?
In Mason, during December, snow falls for 8.5 days and regularly aggregates up to 58mm of snow.
What is the month with the shortest days?
The month with the shortest days is December, with an average of 9h and 30min of daylight.
How many hours of daylight does Mason have in December?
The average day length in December is 9h and 29min.
When is the sunrise / sunset in December?
On the first day of December, sunrise is at 7:28 am and sunset at 5:06 pm. On the last day of the month, sunrise is at 7:46 am and sunset at 5:15 pm EST.
How long on average sun shines in December?
In Mason, the average sunshine duration in December is 3.9h.
What are the months with the lowest UV index?
January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index.
What is the UV index reading in December in Mason?
In December, the average daily maximum UV index is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to UV radiation.
Average high temperature
Average low temperature
Average wind speed
Average max. wind speed
Average wind speed gusts
Average humidity
Average rainfall
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility
Average temperature in December - Mason, WV
Average temperature in December
Mason, WV
  • Average high temperature in December: 6.1°C

The warmest month (with the highest average high temperature) is July (30.3°C).
The month with the lowest average high temperature is January (2.9°C).

  • Average low temperature in December: -0.7°C

The month with the highest average low temperature is July (17.8°C).
The coldest month (with the lowest average low temperature) is January (-4.5°C).

Average pressure in December - Mason, WV
Average pressure in December
Mason, WV
  • Average pressure in December: 1020.5mbar

The month with the highest atmospheric pressure is November (1021.1mbar).
The month with the lowest atmospheric pressure is June (1014.6mbar).

Average wind speed in December - Mason, WV
Average wind speed in December
Mason, WV
  • Average wind speed in December: 10.5km/h

The windiest month (with the highest average wind speed) is February (11.4km/h).
The calmest month (with the lowest average wind speed) is August (7.2km/h).

Average humidity in December - Mason, WV
Average humidity in December
Mason, WV
  • Average humidity in December: 81%

The months with the highest relative humidity are January and February (82%).
The month with the lowest relative humidity is August (74%).

Average rainfall in December - Mason, WV
Average rainfall in December
Mason, WV
  • Average rainfall in December: 81mm

The wettest month (with the highest rainfall) is May (96mm).
The driest month (with the least rainfall) is September (49mm).

Average rainfall days in December - Mason, WV
Average rainfall days in December
Mason, WV
  • Average rainfall days in December: 12.9 days

The month with the highest number of rainy days is May (19.4 days).
The month with the least rainy days is November (10.6 days).

Average snowfall in December - Mason, WV
Average snowfall in December
Mason, WV
  • Average snowfall in December: 58mm

The month with the highest snowfall is February (96mm).
The months with the least snowfall are May, June, July, August and September (0mm).

Average snowfall days in December - Mason, WV
Average snowfall days in December
Mason, WV
  • Average snowfall days in December: 8.5 days

The month with the highest number of snowfall days is January (11.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December / Average sunshine in December - Mason, WV
Average daylight in December /
Average sunshine in December
Mason, WV
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 54min).
The month with the shortest days is December (Average daylight: 9h and 30min).

  • Average sunshine in December: 3h and 5min

The month with the most sunshine is August (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 3h and 30min).

Average sunshine days in December - Mason, WV
Average sunshine days in December
Mason, WV
  • Average sunshine days in December: 12.5 days

The month with the most sunshine days is November (17.3 days).
The month with the least sunshine days is February (9.1 days).

Average UV index in December - Mason, WV
Average UV index in December
Mason, WV
  • 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 - Mason, WV
Average cloud cover in December
Mason, WV
  • Average cloud cover in December: 60

The month with the most cloud cover is January (Cloud cover 63).
The month with the least cloud cover is August (Cloud cover 32).

Average visibility in December - Mason, WV
Average visibility in December
Mason, WV
  • Average visibility in December: 8km

The months with the highest visibility are April and November (9km).
The months with the lowest visibility are January, February, March, May, June, July, August, September, October and December (8km).

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