December weather forecast
Saint Louis, VA

Weather in December

December, the first month of the winter in Saint Louis, is still a chilly month, with an average temperature varying between 30.9°F (-0.6°C) and 43.7°F (6.5°C).

Temperature

In Saint Louis, the average high-temperature in December slightly decreases from a cool 52.5°F (11.4°C) in November to a frosty 43.7°F (6.5°C). In Saint Louis, the average low-temperature is 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, during 10.7 rainfall days, 2.6" (66mm) of precipitation is typically accumulated. In Saint Louis, during the entire year, the rain falls for 162.2 days and collects up to 31.1" (790mm) of precipitation.

Snowfall

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

Daylight

The month with the shortest days in Saint Louis is December, with an average of 9h and 29min 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 4:58 pm EST.

Sunshine

The months with the least sunshine in Saint Louis, Virginia, are January and December, with an average of 5.1h of sunshine.

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 estimate of 2, and below, represents a low health risk from exposure to the Sun's UV rays for the ordinary person.
Note: The daily maximum UV index of 2 in December interpret into the following advice:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. A wide-brim hat offers excellent sun protection for the eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What are the most humid months in Saint Louis?

October and December, with an average relative humidity of 78%, are most humid months in Saint Louis.

What is the average humidity in December in Saint Louis?

The average relative humidity in December is 78%.

How many days does it rain in December in Saint Louis?

In Saint Louis, Virginia, in December, during 10.7 rainfall days, 2.6" (66mm) of precipitation is typically accumulated.

How much does it snow in Saint Louis 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 in Saint Louis?

December has the shortest days of the year, with an average of 9h and 29min of daylight.

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.

When are sunrise and sunset in December in Saint Louis?

On the first day of December in Saint Louis, 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 4:58 pm EST.

What is the month with the least sunshine in Saint Louis?

The months with the least sunshine in Saint Louis, Virginia, are January and December, with an average of 5.1h of sunshine.

How long on average sun shines in December in Saint Louis?

The average sunshine duration in December is 5.1h.

What are the months with the lowest UV index in Saint Louis?

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

What is the UV index reading in December in Saint Louis?

The average daily maximum UV index in December in Saint Louis is 2. A UV Index of 2, and less, symbolizes a low health risk from exposure to the Sun's 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
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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 29min

The month with the longest days is June (Average daylight: 14h and 52min).
The month with the shortest days is December (Average daylight: 9h and 29min).

  • Average sunshine in December: 5h and 6min

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).

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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).

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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).

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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).

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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).

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