December weather forecast
Grafton, WV

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Weather in December

December brings the year to a close with a turn toward colder conditions and shorter days. Weather in December is dominated by a low-high temperature bracket from 29.5°F (-1.4°C) to 41.5°F (5.3°C). The chill of the falling temperatures and increased snowfall signals a returning winter scene. Despite the shorter daylight hours and cold weather, the festive spirit keeps the city shimmering with light and activity. Concluding the year, December embraces the charm of winter as residents make merry in the holiday season.

Temperature

As December arrives, Grafton's weather displays a minor decrease in high-temperatures, transitioning from November's fresh 50.2°F (10.1°C) to an icy 41.5°F (5.3°C). An average low-temperature of 29.5°F (-1.4°C) is observed during the December nights.

Humidity

In December, the average relative humidity is 82%.

Rainfall

In Grafton, West Virginia, in December, during 13.7 rainfall days, 3.19" (81mm) of precipitation is typically accumulated. In Grafton, during the entire year, the rain falls for 184.5 days and collects up to 35.35" (898mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Grafton, West Virginia, during December, snow falls for 11.5 days and regularly aggregates up to 4.96" (126mm) of snow. Throughout the year, in Grafton, there are 58.4 snowfall days, and 31.26" (794mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of December, sunrise is at 7:21 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:39 am and sunset at 5:06 pm EST.

Sunshine

The average sunshine in December is 3.9h.

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 estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV radiation for the ordinary person.
Note: A daily high UV index of 2 in December leads to these guidelines:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Sunglasses that ward off UVA and UVB rays play a pivotal role in reducing solar eye damage. Mind you! Snow reflection can increase the intensity of the Sun's UV radiation nearly twofold.

Frequently asked questions

How cold is December in Grafton?

The high-temperature during December is 41.5°F (5.3°C) and the low-temperature is 29.5°F (-1.4°C). The average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, in August is calculated to be 87.8°F (31°C).

What is the average humidity in December?

In December, the average relative humidity is 82%.

How much does it rain in December?

In December, in Grafton, the rain falls for 13.7 days. Throughout December, 3.19" (81mm) of precipitation is accumulated.

How many days does it snow in December?

In Grafton, during December, snow falls for 11.5 days and regularly aggregates up to 4.96" (126mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

In December, the average day length is 9h and 27min.

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 4:57 pm. On the last day of the month, in Grafton, sunrise is at 7:39 am and sunset at 5:06 pm EST.

How many hours of sunshine does Grafton have in December?

In December, the average sunshine duration is 3.9h.

When is the lowest UV index in Grafton?

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

What is the UV index intensity in December?

In Grafton, the average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health risk from 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
Grafton, WV

Average temperature in December - Grafton, WV
  • Average high temperature in December: 41.5°F

The warmest month (with the highest average high temperature) is July (82°F).
The month with the lowest average high temperature is January (35.6°F).

  • Average low temperature in December: 29.5°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 (21.7°F).

Average pressure in December
Grafton, WV

Average pressure in December - Grafton, WV
  • 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 (29.96"Hg).

Average wind speed in December
Grafton, WV

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

The windiest month (with the highest average wind speed) is January (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.3mph).

Average humidity in December
Grafton, WV

Average humidity in December - Grafton, WV
  • Average humidity in December: 82%

The months with the highest relative humidity are January and February (84%).
The months with the lowest relative humidity are July and August (77%).

Average rainfall in December
Grafton, WV

Average rainfall in December - Grafton, WV
  • Average rainfall in December: 3.19"

The wettest month (with the highest rainfall) is May (4.06").
The driest month (with the least rainfall) is September (1.89").

Average rainfall days in December
Grafton, WV

Average rainfall days in December - Grafton, WV
  • Average rainfall days in December: 13.7 days

The month with the highest number of rainy days is May (20.8 days).
The month with the least rainy days is February (11.9 days).

Average snowfall in December
Grafton, WV

Average snowfall in December - Grafton, WV
  • Average snowfall in December: 4.96"

The month with the highest snowfall is January (7.87").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Grafton, WV

Average snowfall days in December - Grafton, WV
  • Average snowfall days in December: 11.5 days

The month with the highest number of snowfall days is January (16.8 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Grafton, WV

Average daylight in December / Average sunshine in December - Grafton, 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 6min).
The month with the least sunshine is January (Average sunshine: 3h and 12min).

Average sunshine days in December
Grafton, WV

Average sunshine days in December - Grafton, WV
  • Average sunshine days in December: 9.1 days

The month with the most sunshine days is October (13.7 days).
The month with the least sunshine days is January (6.5 days).

Average UV index in December
Grafton, WV

Average UV index in December - Grafton, WV
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

Average cloud cover in December
Grafton, WV

Average cloud cover in December - Grafton, WV
  • Average cloud cover in December: 61

The month with the most cloud cover is January (Cloud cover 68).
The month with the least cloud cover is August (Cloud cover 35).

Average visibility in December
Grafton, WV

Average visibility in December - Grafton, WV
  • Average visibility in December: 5mi

The months with the highest visibility are March, April, May, June, July, August, September, October, November and December (5mi).
The months with the lowest visibility are January and February (4mi).

Grafton, West Virginia, USA

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