December weather forecast
Katy, WV

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Weather in December

The first month of the winter, December, is also an icy month in Katy, West Virginia, with an average temperature ranging between max 41.5°F (5.3°C) and min 29.3°F (-1.5°C).

Temperature

The onset of December coincides with a reduction in the average high-temperature, falling from a fresh 50.5°F (10.3°C) in November to a cold 41.5°F (5.3°C). Nighttime temperatures in December average to a freezing cold 29.3°F (-1.5°C).

Humidity

In December, the average relative humidity is 82%.

Rainfall

In Katy, in December, it is raining for 13.1 days, with typically 3.35" (85mm) of accumulated precipitation. In Katy, during the entire year, the rain falls for 188.6 days and collects up to 39.17" (995mm) of precipitation.

Snowfall

Months with snowfall are January through May, October through December. In Katy, during December, snow falls for 10.7 days and regularly aggregates up to 4.29" (109mm) of snow. In Katy, West Virginia, during the entire year, snow falls for 52.1 days and aggregates up to 24.21" (615mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 24min of daylight.
On the first day of December, sunrise is at 7:22 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:07 pm EST.

Sunshine

The average sunshine in December in Katy is 3.5h.

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 reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: A daily high UV index of 2 in December leads to these guidelines:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. Boost your sun resistance with garments that are densely woven yet spacious. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
Updated: Jul 21, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is it in December?

The average high-temperature and low-temperature during December are 41.5°F (5.3°C) and 29.3°F (-1.5°C) respectively. The average heat index (a.k.a. 'feels like', 'felt air temperature'), which combines relative humidity and air temperature, in August is calculated to be 87.8°F (31°C).

What is the average humidity in December in Katy?

In Katy, the average relative humidity in December is 82%.

How much does it rain in December?

In Katy, in December, during 13.1 rainfall days, 3.35" (85mm) of precipitation is typically accumulated.

How much does it snow in December?

In Katy, during December, snow falls for 10.7 days and regularly aggregates up to 4.29" (109mm) of snow.

What is the month with the shortest days?

December has the shortest days of the year, with an average of 9h and 24min of daylight.

How many hours of daylight does Katy have in December?

The average day length in December is 9h and 26min.

When are sunrise and sunset in December in Katy?

In December, on the first day of the month, sunrise is at 7:22 am and sunset at 4:57 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:07 pm EST.

How many hours of sunshine does Katy have in December?

In Katy, the average sunshine duration in December is 3.5h.

When is the lowest UV index?

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?

The average daily maximum UV index in December is 2. A UV Index reading 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
Katy, WV

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

The warmest month (with the highest average high temperature) is July (83.1°F).
The month with the lowest average high temperature is January (35.8°F).

  • Average low temperature in December: 29.3°F

The month with the highest average low temperature is July (61.3°F).
The coldest month (with the lowest average low temperature) is January (22.5°F).

Average pressure in December
Katy, WV

Average pressure in December - Katy, 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
Katy, WV

Average wind speed in December - Katy, WV
  • Average wind speed in December: 6.3mph

The windiest months (with the highest average wind speed) are January and February (7mph).
The calmest month (with the lowest average wind speed) is August (4.2mph).

Average humidity in December
Katy, WV

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

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

Average rainfall in December
Katy, WV

Average rainfall in December - Katy, WV
  • Average rainfall in December: 3.35"

The wettest month (with the highest rainfall) is May (4.53").
The driest month (with the least rainfall) is November (2.24").

Average rainfall days in December
Katy, WV

Average rainfall days in December - Katy, WV
  • Average rainfall days in December: 13.1 days

The month with the highest number of rainy days is May (21.3 days).
The month with the least rainy days is January (10.8 days).

Average snowfall in December
Katy, WV

Average snowfall in December - Katy, WV
  • Average snowfall in December: 4.29"

The month with the highest snowfall is February (6.18").
The months with the least snowfall are June, July, August and September (0").

Average snowfall days in December
Katy, WV

Average snowfall days in December - Katy, WV
  • Average snowfall days in December: 10.7 days

The month with the highest number of snowfall days is January (15 days).
The months with the least snowfall days are June, July, August and September (0 days).

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

Average daylight in December / Average sunshine in December - Katy, WV
  • Average daylight in December: 9h and 2min

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 24min).

  • Average sunshine in December: 3h and 3min

The month with the most sunshine is August (Average sunshine: 9h and 54min).
The month with the least sunshine is January (Average sunshine: 2h and 54min).

Average sunshine days in December
Katy, WV

Average sunshine days in December - Katy, WV
  • Average sunshine days in December: 10.8 days

The month with the most sunshine days is November (15.4 days).
The month with the least sunshine days is May (7.8 days).

Average UV index in December
Katy, WV

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

The months with the highest UV index are May and 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
Katy, WV

Average cloud cover in December - Katy, WV
  • Average cloud cover in December: 64

The month with the most cloud cover is January (Cloud cover 69).
The month with the least cloud cover is August (Cloud cover 37).

Average visibility in December
Katy, WV

Average visibility in December - Katy, 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).

Katy, West Virginia, USA

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