December weather forecast
Saint Thomas, MO

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Weather in December

December, the first month of the winter in Saint Thomas, is still a chilly month, with temperature in the range of an average high of 42.8°F (6°C) and an average low of 29.1°F (-1.6°C).

Temperature

The arrival of December corresponds with a temperature reduction, down from November's fresh 53.8°F (12.1°C) to a chilly 42.8°F (6°C). During the nights in December, Saint Thomas experiences a consistent average temperature of 29.1°F (-1.6°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Saint Thomas, Missouri, in December, it is raining for 4.6 days, with typically 0.51" (13mm) of accumulated precipitation. Throughout the year, there are 93.7 rainfall days, and 9.29" (236mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In December, it is snowing for 2.8 days. Throughout December, 0.43" (11mm) of snow is accumulated. In Saint Thomas, during the entire year, snow falls for 14.9 days and aggregates up to 2.13" (54mm) 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 7:07 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:58 pm CST.

Sunshine

In December, the average sunshine is 5.1h.

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 value of 2, and less, symbolizes a minimal health vulnerability from unprotected exposure to Sun's UV rays for ordinary individuals.
Note: In December, an average UV index of 2 transforms into the following instructions:
Children, infants, and individuals with sensitive skin should be constantly protected from extended sun exposure. The Sun's most harmful UV rays are emitted around midday; avoid staying outdoors for long during this time. Limit sun-induced ocular harm with sunglasses that feature UVA and UVB filtration. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Updated: Aug 12, 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 42.8°F (6°C) and 29.1°F (-1.6°C) respectively. In August, the average heat index (a.k.a. 'feels like', 'real feel'), which factors the actual air temperature with the relative humidity, is evaluated at 100.4°F (38°C).

What is the average humidity in December?

In Saint Thomas, the average relative humidity in December is 76%.

How many days does it rain in December?

In December, the rain falls for 4.6 days. Throughout December, 0.51" (13mm) of precipitation is accumulated.

How much does it snow in December?

In Saint Thomas, in December, snow falls for 2.8 days, with typically accumulated 0.43" (11mm) of snow.

What is the month with the shortest days in Saint Thomas?

The month with the shortest days is December, with an average of 9h and 30min of daylight.

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

In December, the average day length is 9h and 33min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:07 am and sunset at 4:48 pm. On the last day of the month, sunrise is at 7:25 am and sunset at 4:58 pm CST.

How long on average sun shines in December?

In Saint Thomas, the average sunshine duration in December is 5.1h.

What is the month with the lowest UV index in Saint Thomas?

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

How high is the UV index in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes a low health threat from unprotected exposure to 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 Thomas, MO

Average temperature in December - Saint Thomas, MO
  • Average high temperature in December: 42.8°F

The warmest month (with the highest average high temperature) is July (89.2°F).
The month with the lowest average high temperature is January (38.5°F).

  • Average low temperature in December: 29.1°F

The month with the highest average low temperature is July (67.8°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Saint Thomas, MO

Average pressure in December - Saint Thomas, MO
  • Average pressure in December: 30.13"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

Average wind speed in December
Saint Thomas, MO

Average wind speed in December - Saint Thomas, MO
  • Average wind speed in December: 8.5mph

The windiest month (with the highest average wind speed) is January (8.8mph).
The calmest months (with the lowest average wind speed) are July and August (5.8mph).

Average humidity in December
Saint Thomas, MO

Average humidity in December - Saint Thomas, MO
  • Average humidity in December: 76%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Saint Thomas, MO

Average rainfall in December - Saint Thomas, MO
  • Average rainfall in December: 0.51"

The wettest month (with the highest rainfall) is May (1.3").
The driest month (with the least rainfall) is November (0.47").

Average rainfall days in December
Saint Thomas, MO

Average rainfall days in December - Saint Thomas, MO
  • Average rainfall days in December: 4.6 days

The month with the highest number of rainy days is May (11.3 days).
The month with the least rainy days is January (4 days).

Average snowfall in December
Saint Thomas, MO

Average snowfall in December - Saint Thomas, MO
  • Average snowfall in December: 0.43"

The month with the highest snowfall is January (0.71").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Saint Thomas, MO

Average snowfall days in December - Saint Thomas, MO
  • Average snowfall days in December: 2.8 days

The month with the highest number of snowfall days is January (5.2 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 Thomas, MO

Average daylight in December / Average sunshine in December - Saint Thomas, MO
  • Average daylight in December: 9h and 3min

The month with the longest days is June (Average daylight: 14h and 48min).
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 June (Average sunshine: 10h and 36min).
The month with the least sunshine is February (Average sunshine: 4h and 48min).

Average sunshine days in December
Saint Thomas, MO

Average sunshine days in December - Saint Thomas, MO
  • Average sunshine days in December: 23.7 days

The month with the most sunshine days is January (24.3 days).
The month with the least sunshine days is May (16.7 days).

Average UV index in December
Saint Thomas, MO

Average UV index in December - Saint Thomas, MO
  • Average UV index in December: 2

The months with the highest UV index are 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 Thomas, MO

Average cloud cover in December - Saint Thomas, MO
  • Average cloud cover in December: 46

The month with the most cloud cover is February (Cloud cover 49).
The months with the least cloud cover are June and August (Cloud cover 28).

Average visibility in December
Saint Thomas, MO

Average visibility in December - Saint Thomas, MO
  • Average visibility in December: 6mi

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

Saint Thomas, Missouri, USA

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