December weather forecast
Saint Peters, MO

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Weather in December

December concludes the year in Saint Peters, Missouri with the arrival of winter. The cold temperatures, increased snowfall, and shortened daylight hours mark the essence of this month. December gains distinction from accumulating 1.34" (34mm) of snowfall, signifying the onset of the winter season. Consequently, weather conditions generally consist of snow, mixed with bouts of rain and sunshine. As December segues into the new year, it ushers in the full effect of the winter season.

Temperature

With the onset of December, Saint Peters's average high-temperature adjusts, receding from November's cool 53.2°F (11.8°C) to a wintry 41.9°F (5.5°C). Saint Peters records an average temperature drop to a subzero cold 30°F (-1.1°C) in December.

Humidity

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

Rainfall

In Saint Peters, in December, it is raining for 7.4 days, with typically 1.26" (32mm) of accumulated precipitation. In Saint Peters, during the entire year, the rain falls for 133.4 days and collects up to 20.98" (533mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Saint Peters, in December, during 4.1 snowfall days, 1.34" (34mm) of snow is typically accumulated. In Saint Peters, during the entire year, snow falls for 19.4 days and aggregates up to 4.92" (125mm) of snow.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of December, sunrise is at 7:02 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:51 pm CST.

Sunshine

In December, the average sunshine is 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 of 2, and less, symbolizes a minimal health vulnerability from exposure to the Sun's UV radiation for average individuals.
Note: The maximum daily UV index of 2 in December converts into the following recommendations:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Exposing oneself to the midday Sun can be harmful due to the strong UV radiation; limit your time outside. Combat UV radiation's detrimental effects with sun-safe clothing and UV-blocking eyewear. Heads up! The UV radiation from the Sun can almost be doubled by snow reflection.
Updated: Aug 16, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

Is December cold?

In Saint Peters, 41.9°F (5.5°C) is the average high-temperature and 30°F (-1.1°C) is the average low-temperature during December. In August, the average heat index (a.k.a. 'apparent temperature', 'felt air temperature'), which factors the actual air temperature with the relative humidity, is calculated to be 95°F (35°C).

What is the average humidity in December in Saint Peters?

The average relative humidity in December is 76%.

How many days does it rain in December?

In Saint Peters, in December, it is raining for 7.4 days, with typically 1.26" (32mm) of accumulated precipitation.

How much does it snow in December?

In Saint Peters, during December, snow falls for 4.1 days and regularly aggregates up to 1.34" (34mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December?

In Saint Peters, the average day length in December is 9h and 31min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:02 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:20 am and sunset at 4:51 pm CST.

How long on average sun shines in December?

The average sunshine duration in December is 5h.

What is the month 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 in Saint Peters.

What is the UV index intensity in December?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a minimal hazard to health 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 Peters, MO

Average temperature in December - Saint Peters, MO
  • Average high temperature in December: 41.9°F

The warmest month (with the highest average high temperature) is July (87.1°F).
The month with the lowest average high temperature is January (37.4°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (68.4°F).
The coldest month (with the lowest average low temperature) is January (23.9°F).

Average pressure in December
Saint Peters, MO

Average pressure in December - Saint Peters, 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 Peters, MO

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

The windiest month (with the highest average wind speed) is January (9.1mph).
The calmest month (with the lowest average wind speed) is July (5.5mph).

Average humidity in December
Saint Peters, MO

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

The month with the highest relative humidity is May (78%).
The month with the lowest relative humidity is October (71%).

Average rainfall in December
Saint Peters, MO

Average rainfall in December - Saint Peters, MO
  • Average rainfall in December: 1.26"

The wettest month (with the highest rainfall) is April (2.48").
The driest month (with the least rainfall) is February (1.06").

Average rainfall days in December
Saint Peters, MO

Average rainfall days in December - Saint Peters, MO
  • Average rainfall days in December: 7.4 days

The month with the highest number of rainy days is May (15.6 days).
The month with the least rainy days is February (6.7 days).

Average snowfall in December
Saint Peters, MO

Average snowfall in December - Saint Peters, MO
  • Average snowfall in December: 1.34"

The month with the highest snowfall is February (1.65").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Saint Peters, MO

Average snowfall days in December - Saint Peters, MO
  • Average snowfall days in December: 4.1 days

The months with the highest number of snowfall days are January and February (5.8 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 Peters, MO

Average daylight in December / Average sunshine in December - Saint Peters, 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 0min

The months with the most sunshine are June and July (Average sunshine: 10h and 30min).
The month with the least sunshine is January (Average sunshine: 4h and 42min).

Average sunshine days in December
Saint Peters, MO

Average sunshine days in December - Saint Peters, MO
  • Average sunshine days in December: 20.1 days

The month with the most sunshine days is January (20.4 days).
The month with the least sunshine days is July (12.7 days).

Average UV index in December
Saint Peters, MO

Average UV index in December - Saint Peters, MO
  • 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 Peters, MO

Average cloud cover in December - Saint Peters, MO
  • Average cloud cover in December: 48

The month with the most cloud cover is January (Cloud cover 50).
The month with the least cloud cover is August (Cloud cover 27).

Average visibility in December
Saint Peters, MO

Average visibility in December - Saint Peters, 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 Peters, Missouri, USA

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