December weather forecast
Earth City, MO

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Weather in December

The first month of the winter, December, is also an icy month in Earth City, Missouri, with an average temperature ranging between max 42.1°F (5.6°C) and min 30°F (-1.1°C).

Temperature

The average high-temperature drops in December, from November's fresh 53.2°F (11.8°C) to a cold 42.1°F (5.6°C). Nighttime temperatures in December average to a freezing cold 30°F (-1.1°C).

Humidity

The average relative humidity in December is 76%.

Rainfall

In Earth City, in December, it is raining for 7.3 days, with typically 1.73" (44mm) of accumulated precipitation. In Earth City, during the entire year, the rain falls for 141.9 days and collects up to 27.68" (703mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Earth City, in December, snow falls for 4.4 days, with typically accumulated 1.81" (46mm) of snow. In Earth City, Missouri, during the entire year, snow falls for 21.6 days and aggregates up to 6.73" (171mm) 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 the month, sunrise is at 7:01 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

In Earth City, Missouri, the average sunshine in December is 4.9h.

UV index

The months with the lowest UV index are January, February and December, with an average maximum UV index of 2. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for the average person.
Note: The maximum daily UV index of 2 during December translates into the following directions:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. A wide-brimmed hat is a staple for defending the face, eyes, ears, and neck from the Sun. Remember this! The UV radiation of the Sun can be nearly doubled by the reflective properties of snow.
Updated: Jun 19, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold is December?

In December, in Earth City, the average high-temperature is 42.1°F (5.6°C), and the average low-temperature is 30°F (-1.1°C). In August, the average heat index (a.k.a. 'felt air temperature', 'feels like'), which factors the actual air temperature with the relative humidity, is appraised at 95°F (35°C).

What is the average humidity in December?

In December, the average relative humidity is 76%.

How much does it rain in December?

In December, the rain falls for 7.3 days. Throughout December, 1.73" (44mm) of precipitation is accumulated.

How much does it snow in December?

In Earth City, in December, snow falls for 4.4 days, with typically accumulated 1.81" (46mm) 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.

How many hours of daylight does Earth City have in December?

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

When are sunrise and sunset in December?

In December, on the first day of the month, sunrise is at 7:01 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 Earth City have in December?

The average sunshine duration in December is 4.9h.

What are the months with the lowest UV index?

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

What is the UV index reading in December in Earth City?

The average daily maximum UV index in December is 2. A UV Index estimate of 2, and below, represents a minimal health vulnerability 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
Earth City, MO

Average temperature in December - Earth City, MO
  • Average high temperature in December: 42.1°F

The warmest month (with the highest average high temperature) is July (86.7°F).
The month with the lowest average high temperature is January (37.2°F).

  • Average low temperature in December: 30°F

The month with the highest average low temperature is July (68.9°F).
The coldest month (with the lowest average low temperature) is January (24.3°F).

Average pressure in December
Earth City, MO

Average pressure in December - Earth City, 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
Earth City, MO

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

The windiest month (with the highest average wind speed) is January (9.3mph).
The calmest months (with the lowest average wind speed) are July and August (5.6mph).

Average humidity in December
Earth City, MO

Average humidity in December - Earth City, 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 (70%).

Average rainfall in December
Earth City, MO

Average rainfall in December - Earth City, MO
  • Average rainfall in December: 1.73"

The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is February (1.42").

Average rainfall days in December
Earth City, MO

Average rainfall days in December - Earth City, MO
  • Average rainfall days in December: 7.3 days

The month with the highest number of rainy days is July (16.3 days).
The months with the least rainy days are February and December (7.3 days).

Average snowfall in December
Earth City, MO

Average snowfall in December - Earth City, MO
  • Average snowfall in December: 1.81"

The month with the highest snowfall is February (2.05").
The months with the least snowfall are April, May, June, July, August, September and October (0").

Average snowfall days in December
Earth City, MO

Average snowfall days in December - Earth City, MO
  • Average snowfall days in December: 4.4 days

The month with the highest number of snowfall days is January (6.8 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
Earth City, MO

Average daylight in December / Average sunshine in December - Earth City, 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 month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is January (Average sunshine: 4h and 36min).

Average sunshine days in December
Earth City, MO

Average sunshine days in December - Earth City, MO
  • Average sunshine days in December: 18.8 days

The month with the most sunshine days is October (19.2 days).
The month with the least sunshine days is July (11.4 days).

Average UV index in December
Earth City, MO

Average UV index in December - Earth City, 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
Earth City, MO

Average cloud cover in December - Earth City, 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
Earth City, MO

Average visibility in December - Earth City, 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).

Earth City, Missouri, USA

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