December weather forecast
Saint Louis, VA

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Weather in December

December, the first month of the winter in Saint Louis, is also a frosty month, with an average temperature ranging between max 43.7°F (6.5°C) and min 30.9°F (-0.6°C).

Temperature

The beginning of December brings a slight decrease in the average high-temperature, transitioning from a fresh 52.5°F (11.4°C) in November to a chilly 43.7°F (6.5°C). The nights of December anticipate an average low-temperature of 30.9°F (-0.6°C).

Humidity

The months with the highest humidity are October and December, with an average relative humidity of 78%.

Rainfall

In Saint Louis, Virginia, in December, it is raining for 10.7 days, with typically 2.6" (66mm) of accumulated precipitation. Throughout the year, there are 162.2 rainfall days, and 31.1" (790mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through April, October through December. In December, it is snowing for 3.8 days. Throughout December, 2.68" (68mm) of snow is accumulated. Throughout the year, there are 21.9 snowfall days, and 14.88" (378mm) of snow is accumulated.

Daylight

December has the shortest days of the year, 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 4:49 pm. On the last day of December, in Saint Louis, sunrise is at 7:29 am and sunset at 4:59 pm EST.

Sunshine

January and December, with an average of 5.1h of sunshine, are months with the least sunshine.

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 of 2, and less, symbolizes a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the UV index of 2 transforms into the following advice:
Most people face no serious problems with extended sun exposure, but those with fair skin, infants, and children always need protection. To prevent harmful UV exposure, minimize direct contact with the Sun around midday. Opt for tightly woven and loose clothing to enhance protection from the Sun. Beware! Reflection from snow can magnify the Sun's UV radiation nearly twofold.
Updated: Jul 22, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In Saint Louis, in December, the average high-temperature is 43.7°F (6.5°C), and the average low-temperature is 30.9°F (-0.6°C). In August, the average heat index (a.k.a. 'apparent temperature', 'feels like'), which represents the influence of relative humidity on air temperature, is computed to be 93.2°F (34°C).

What are the most humid months?

The months with the highest humidity in Saint Louis are October and December, with an average relative humidity of 78%.

What is the average humidity in December?

In Saint Louis, the average relative humidity in December is 78%.

How much does it rain in December?

In Saint Louis, during December, the rain falls for 10.7 days and regularly aggregates up to 2.6" (66mm) of precipitation.

How much does it snow in December?

In Saint Louis, in December, snow falls for 3.8 days, with typically accumulated 2.68" (68mm) 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.

How many hours of daylight does Saint Louis have in December?

In Saint Louis, Virginia, the average day length in December is 9h and 29min.

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 4:49 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 4:59 pm EST.

What is the month with the least sunshine?

January and December, with an average of 5.1h of sunshine, are months with the least sunshine.

How many hours of sunshine does Saint Louis have in December?

The average sunshine duration in December is 5.1h.

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.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability 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
Saint Louis, VA

Average temperature in December - Saint Louis, VA
  • Average high temperature in December: 43.7°F

The warmest month (with the highest average high temperature) is July (86.5°F).
The month with the lowest average high temperature is January (38.7°F).

  • Average low temperature in December: 30.9°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 (24.8°F).

Average pressure in December
Saint Louis, VA

Average pressure in December - Saint Louis, 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
Saint Louis, VA

Average wind speed in December - Saint Louis, VA
  • Average wind speed in December: 6.5mph

The windiest month (with the highest average wind speed) is March (7.3mph).
The calmest month (with the lowest average wind speed) is August (4.4mph).

Average humidity in December
Saint Louis, VA

Average humidity in December - Saint Louis, VA
  • Average humidity in December: 78%

The months with the highest relative humidity are October and December (78%).
The month with the lowest relative humidity is July (73%).

Average rainfall in December
Saint Louis, VA

Average rainfall in December - Saint Louis, VA
  • Average rainfall in December: 2.6"

The wettest months (with the highest rainfall) are May and August (3.35").
The driest month (with the least rainfall) is September (1.93").

Average rainfall days in December
Saint Louis, VA

Average rainfall days in December - Saint Louis, VA
  • Average rainfall days in December: 10.7 days

The month with the highest number of rainy days is May (17.3 days).
The month with the least rainy days is January (10.1 days).

Average snowfall in December
Saint Louis, VA

Average snowfall in December - Saint Louis, VA
  • Average snowfall in December: 2.68"

The month with the highest snowfall is January (4.17").
The months with the least snowfall are May, June, July, August and September (0").

Average snowfall days in December
Saint Louis, VA

Average snowfall days in December - Saint Louis, VA
  • Average snowfall days in December: 3.8 days

The month with the highest number of snowfall days is January (6.8 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Saint Louis, VA

Average daylight in December / Average sunshine in December - Saint Louis, VA
  • 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: 5h and 1min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 6min).

Average sunshine days in December
Saint Louis, VA

Average sunshine days in December - Saint Louis, VA
  • Average sunshine days in December: 16.8 days

The month with the most sunshine days is November (19.3 days).
The month with the least sunshine days is May (11.1 days).

Average UV index in December
Saint Louis, VA

Average UV index in December - Saint Louis, 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
Saint Louis, VA

Average cloud cover in December - Saint Louis, VA
  • Average cloud cover in December: 46

The month with the most cloud cover is March (Cloud cover 47).
The month with the least cloud cover is July (Cloud cover 30).

Average visibility in December
Saint Louis, VA

Average visibility in December - Saint Louis, VA
  • Average visibility in December: 5mi

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

Saint Louis, Virginia, USA

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