December weather forecast
Greendale, MO

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Weather in December

The first month of the winter, December, is also a wintry month in Greendale, Missouri, with an average temperature varying between 30.6°F (-0.8°C) and 42.6°F (5.9°C).

Temperature

Greendale experiences a temperature shift at the start of December, with average high-temperatures adjusting from a fresh 53.4°F (11.9°C) in November to a cold 42.6°F (5.9°C). During the month of December, Greendale anticipates a mean low-temperature of 30.6°F (-0.8°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In December, the rain falls for 7.5 days. Throughout December, 2.05" (52mm) of precipitation is accumulated. Throughout the year, there are 144.8 rainfall days, and 30.59" (777mm) of precipitation is accumulated.

Snowfall

January through March, November and December are months with snowfall. In Greendale, during December, snow falls for 3.1 days and regularly aggregates up to 1.85" (47mm) of snow. Throughout the year, there are 16.2 snowfall days, and 8.19" (208mm) of snow is accumulated.

Daylight

With an average of 9h and 30min of daylight, December has the shortest days of the year.
On the first day of the month, sunrise is at 7:00 am and sunset at 4:40 pm. On the last day of December, sunrise is at 7:19 am and sunset at 4:50 pm CST.

Sunshine

The average sunshine in December is 4.9h.

UV index

The months with the lowest UV index in Greendale are January, February and December, with an average maximum UV index of 2. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for ordinary individuals.
Note: The UV index of 2 during December leads to these advisories:
Despite most people tolerating extended sun exposure, it is critical to always protect those with sensitive skin, infants, and children. The solar radiation around mid-day is intense; avoid the Sun and stay safe. Boost your sun resistance with garments that are densely woven yet spacious. Foresee this! The reflection from snow can nearly double the intensity of UV radiation from the Sun.
Updated: Aug 30, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

December temperatures vary between a high-temperature of 42.6°F (5.9°C) and a low-temperature of 30.6°F (-0.8°C). The average heat index (a.k.a. 'apparent temperature', 'real feel'), which represents the influence of relative humidity on air temperature, in August is estimated at 95°F (35°C).

What is the average humidity in December?

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

How many days does it rain in December?

In Greendale, in December, during 7.5 rainfall days, 2.05" (52mm) of precipitation is typically accumulated.

How much does it snow in December?

In Greendale, during December, snow falls for 3.1 days and regularly aggregates up to 1.85" (47mm) of snow.

What is the month with the shortest days?

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?

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

What time are sunrise and sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:40 pm. On the last day of the month, sunrise is at 7:19 am and sunset at 4:50 pm CST.

How many hours of sunshine does Greendale have in December?

In Greendale, the average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

January, February 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 Greendale?

The average daily maximum UV index in December is 2. A UV Index reading of 2, and below, represents a low health threat 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
Greendale, MO

Average temperature in December - Greendale, MO
  • Average high temperature in December: 42.6°F

The warmest month (with the highest average high temperature) is July (86.9°F).
The month with the lowest average high temperature is January (37.8°F).

  • Average low temperature in December: 30.6°F

The month with the highest average low temperature is July (69.1°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Greendale, MO

Average pressure in December - Greendale, 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
Greendale, MO

Average wind speed in December - Greendale, MO
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is January (9.2mph).
The calmest months (with the lowest average wind speed) are July and August (5.5mph).

Average humidity in December
Greendale, MO

Average humidity in December - Greendale, 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 (70%).

Average rainfall in December
Greendale, MO

Average rainfall in December - Greendale, MO
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is May (3.58").
The driest month (with the least rainfall) is February (1.69").

Average rainfall days in December
Greendale, MO

Average rainfall days in December - Greendale, MO
  • Average rainfall days in December: 7.5 days

The month with the highest number of rainy days is May (16.9 days).
The month with the least rainy days is January (6.5 days).

Average snowfall in December
Greendale, MO

Average snowfall in December - Greendale, MO
  • Average snowfall in December: 1.85"

The month with the highest snowfall is February (2.6").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Greendale, MO

Average snowfall days in December - Greendale, MO
  • Average snowfall days in December: 3.1 days

The month with the highest number of snowfall days is February (5.2 days).
The months with the least snowfall days are May, June, July and August (0 days).

Average daylight in December /
Average sunshine in December
Greendale, MO

Average daylight in December / Average sunshine in December - Greendale, 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: 4h and 5min

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 36min).

Average sunshine days in December
Greendale, MO

Average sunshine days in December - Greendale, MO
  • Average sunshine days in December: 19.9 days

The month with the most sunshine days is January (21 days).
The month with the least sunshine days is June (11.2 days).

Average UV index in December
Greendale, MO

Average UV index in December - Greendale, 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 and December (UV index 2).

Average cloud cover in December
Greendale, MO

Average cloud cover in December - Greendale, 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
Greendale, MO

Average visibility in December - Greendale, 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).

Greendale, Missouri, USA

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