December weather forecast
Wentzville, MO

Share

Weather in December

December announces the onset of winter in Wentzville, Missouri, along with a drastic drop in temperatures. The festive holiday season coincides with cold nights and numb mornings. Temperatures bottom at 41.7°F (5.4°C), sometimes even lower, with the winter cold thoroughly setting in. Even though the number of daylight hours dwindles, the month enjoys plenty of clear and sunny days. The appearance of snow starts to bedeck the city with a white blanket, heralding the arrival of the New Year.

Temperature

During the transition into December, Wentzville observes a decrease in the average high-temperature, falling from a cool 53.1°F (11.7°C) in November to a wintry 41.7°F (5.4°C). Wentzville experiences a mean temperature of 29.8°F (-1.2°C) during December nights.

Humidity

The average relative humidity in December is 76%.

Rainfall

In December, the rain falls for 8.5 days. Throughout December, 1.93" (49mm) of precipitation is accumulated. In Wentzville, during the entire year, the rain falls for 152.1 days and collects up to 32.01" (813mm) of precipitation.

Snowfall

Months with snowfall are January through April, November and December. In December, it is snowing for 4 days. Throughout December, 1.34" (34mm) of snow is accumulated. Throughout the year, in Wentzville, there are 21.4 snowfall days, and 8.62" (219mm) of snow is accumulated.

Daylight

The month with the shortest days is December, with an average of 9h and 30min of daylight.
On the first day of the month, sunrise is at 7:03 am and sunset at 4:42 pm. On the last day of December, sunrise is at 7:21 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 are January, February, November and December, with an average maximum UV index of 2. A UV Index of 2, and less, symbolizes a low threat to health from exposure to the Sun's UV rays for average individuals.
Note: The daily maximum UV index of 2 in December interprets into the following advice:
Prolonged sun exposure should always be prevented in babies, children, and those with sensitive skin. Direct exposure to the Sun's intense radiation around midday should be avoided for health reasons. Employ a hat with a wide brim for robust protection, cutting UV exposure by half. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
Updated: Aug 29, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

An average high-temperature, in December, in Wentzville, is 41.7°F (5.4°C) and the average low-temperature is 29.8°F (-1.2°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which combines relative humidity and air temperature, is calculated to be 96.8°F (36°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How much does it rain in December?

In Wentzville, in December, during 8.5 rainfall days, 1.93" (49mm) of precipitation is typically accumulated.

How many days does it snow in December?

In Wentzville, during December, snow falls for 4 days and regularly aggregates up to 1.34" (34mm) of snow.

What is the month with the shortest days in Wentzville?

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

What is the average length of the day in December?

The average day length in December is 9h and 30min.

When is the sunrise / sunset in December?

In December, on the first day of the month, sunrise is at 7:03 am and sunset at 4:42 pm. On the last day of the month, sunrise is at 7:21 am and sunset at 4:51 pm CST.

How long on average sun shines in December in Wentzville?

In December, the average sunshine duration is 5h.

When is 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?

In December, the average daily maximum UV index is 2. A UV Index reading of 2, and below, represents a low health risk 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
Wentzville, MO

Average temperature in December - Wentzville, MO
  • Average high temperature in December: 41.7°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: 29.8°F

The month with the highest average low temperature is July (68°F).
The coldest month (with the lowest average low temperature) is January (23.5°F).

Average pressure in December
Wentzville, MO

Average pressure in December - Wentzville, 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
Wentzville, MO

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

The windiest months (with the highest average wind speed) are January and February (8.9mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in December
Wentzville, MO

Average humidity in December - Wentzville, MO
  • Average humidity in December: 76%

The month with the highest relative humidity is May (79%).
The month with the lowest relative humidity is October (72%).

Average rainfall in December
Wentzville, MO

Average rainfall in December - Wentzville, MO
  • Average rainfall in December: 1.93"

The wettest month (with the highest rainfall) is April (3.82").
The driest month (with the least rainfall) is February (1.77").

Average rainfall days in December
Wentzville, MO

Average rainfall days in December - Wentzville, MO
  • Average rainfall days in December: 8.5 days

The month with the highest number of rainy days is May (17.2 days).
The month with the least rainy days is January (7.8 days).

Average snowfall in December
Wentzville, MO

Average snowfall in December - Wentzville, MO
  • Average snowfall in December: 1.34"

The month with the highest snowfall is February (3.15").
The months with the least snowfall are May, June, July, August, September and October (0").

Average snowfall days in December
Wentzville, MO

Average snowfall days in December - Wentzville, MO
  • Average snowfall days in December: 4 days

The month with the highest number of snowfall days is January (7.3 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
Wentzville, MO

Average daylight in December / Average sunshine in December - Wentzville, 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
Wentzville, MO

Average sunshine days in December - Wentzville, MO
  • Average sunshine days in December: 17.5 days

The month with the most sunshine days is October (18.6 days).
The month with the least sunshine days is June (10.9 days).

Average UV index in December
Wentzville, MO

Average UV index in December - Wentzville, 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
Wentzville, MO

Average cloud cover in December - Wentzville, MO
  • Average cloud cover in December: 47

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
Wentzville, MO

Average visibility in December - Wentzville, 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).

Wentzville, Missouri, USA

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location