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 fresh 53.2°F (11.8°C) to a wintry 41.9°F (5.5°C). Saint Peters reports an average low-temperature of 30°F (-1.1°C) during the nights of December.

Humidity

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

Rainfall

In December, in Saint Peters, the rain falls for 7.4 days. Throughout December, 1.26" (32mm) of precipitation is accumulated. 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 December, it is snowing for 4.1 days. Throughout December, 1.34" (34mm) of snow is accumulated. In Saint Peters, Missouri, during the entire year, snow falls for 19.4 days and aggregates up to 4.92" (125mm) of snow.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year in Saint Peters.
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

The months with the lowest UV index in Saint Peters are January, February, November and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a minimal health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: The maximum daily UV index, 2 in December, converts into the following recommendations:
It is important to always shield children, babies, and individuals with sensitive skin from prolonged exposure to the sun. For health reasons, it's advisable to reduce direct sun exposure during peak hours around midday. To cut down UV radiation exposure by about half, sport a wide-brim hat. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
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Frequently asked questions

How cold does it get in Saint Peters in December?

The high-temperature, in December, in Saint Peters, records 41.9°F (5.5°C), while the low-temperature is 30°F (-1.1°C). The average heat index (a.k.a. 'feels like', 'real feel'), which combines relative humidity and air temperature, in August is evaluated at 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, the rain falls for 7.4 days. Throughout December, 1.26" (32mm) of precipitation is accumulated.

How many days does it snow in December in Saint Peters?

In December, it is snowing for 4.1 days. Throughout December, 1.34" (34mm) of snow is accumulated.

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

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

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

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

What time are sunrise and sunset in December in Saint Peters?

In December, on the first day of the month, 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 many hours of sunshine does Saint Peters have in December?

In December, the average sunshine duration is 5h.

When is the lowest UV index in Saint Peters?

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

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

The average daily maximum UV index in December in Saint Peters, Missouri, is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health 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 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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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).

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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).

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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).

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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).

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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).

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Saint Peters, Missouri, USA

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