December weather forecast
Arnold, MO

Share

Weather in December

December, the first month of the winter in Arnold, is still a chilly month, with an average temperature fluctuating between 30.7°F (-0.7°C) and 43.2°F (6.2°C).

Temperature

December's arrival corresponds with a decrease in average high-temperatures, from November's fresh 53.8°F (12.1°C) to a frosty 43.2°F (6.2°C). During December, the average low-temperature is recorded at a subzero cold 30.7°F (-0.7°C).

Humidity

In December, the average relative humidity is 76%.

Rainfall

In Arnold, in December, during 8.2 rainfall days, 2.2" (56mm) of precipitation is typically accumulated. In Arnold, during the entire year, the rain falls for 146.1 days and collects up to 32.36" (822mm) of precipitation.

Snowfall

January through March, November and December are months with snowfall. In Arnold, in December, during 3 snowfall days, 1.89" (48mm) of snow is typically accumulated. Throughout the year, there are 15.3 snowfall days, and 8.27" (210mm) 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 December in Arnold, sunrise is at 7:00 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:51 pm CST.

Sunshine

The average sunshine in December is 4.9h.

UV index

January, February and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health hazard from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the average maximum UV index of 2 translates into the following recommendations:
Although the majority can endure up to an hour in the sun without burns, children always require sun protection. The midday Sun can be dangerous due to its intense radiation; always find shade and reduce exposure. For optimum UV protection, wear sun-resistant attire complemented with a hat and quality shades. Be aware! The intensity of the Sun's UV radiation can be amplified nearly twice due to snow reflection.
Updated: Aug 14, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

How cold does it get in December?

The average high-temperature, in December, in Arnold, is 43.2°F (6.2°C), while the average low-temperature is 30.7°F (-0.7°C). The average heat index (a.k.a. 'feels like', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in August is appraised at 96.8°F (36°C).

What is the average humidity in December?

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

How much does it rain in December?

In Arnold, during December, the rain falls for 8.2 days and regularly aggregates up to 2.2" (56mm) of precipitation.

How many days does it snow in December?

In Arnold, during December, snow falls for 3 days and regularly aggregates up to 1.89" (48mm) of snow.

What is the month with the shortest days?

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

What is the average length of the day in December in Arnold?

In December, the average day length is 9h and 32min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:00 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:18 am and sunset at 4:51 pm CST.

How many hours of sunshine does Arnold have in December?

The average sunshine duration in December is 4.9h.

What is the month 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.

How high is the UV index in December?

The average daily maximum UV index in December is 2. A UV Index of 2, and less, symbolizes a low health threat 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
Arnold, MO

Average temperature in December - Arnold, MO
  • Average high temperature in December: 43.2°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 (37.9°F).

  • Average low temperature in December: 30.7°F

The month with the highest average low temperature is July (69.3°F).
The coldest month (with the lowest average low temperature) is January (25°F).

Average pressure in December
Arnold, MO

Average pressure in December - Arnold, 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
Arnold, MO

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

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

Average humidity in December
Arnold, MO

Average humidity in December - Arnold, 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
Arnold, MO

Average rainfall in December - Arnold, MO
  • Average rainfall in December: 2.2"

The wettest month (with the highest rainfall) is May (3.94").
The driest months (with the least rainfall) are February and November (1.77").

Average rainfall days in December
Arnold, MO

Average rainfall days in December - Arnold, MO
  • Average rainfall days in December: 8.2 days

The month with the highest number of rainy days is July (16.9 days).
The months with the least rainy days are January and February (6.8 days).

Average snowfall in December
Arnold, MO

Average snowfall in December - Arnold, MO
  • Average snowfall in December: 1.89"

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
Arnold, MO

Average snowfall days in December - Arnold, MO
  • Average snowfall days in December: 3 days

The months with the highest number of snowfall days are January and February (4.8 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
Arnold, MO

Average daylight in December / Average sunshine in December - Arnold, 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 June (Average sunshine: 10h and 24min).
The month with the least sunshine is January (Average sunshine: 4h and 30min).

Average sunshine days in December
Arnold, MO

Average sunshine days in December - Arnold, MO
  • Average sunshine days in December: 19.7 days

The month with the most sunshine days is January (20.9 days).
The month with the least sunshine days is June (11.6 days).

Average UV index in December
Arnold, MO

Average UV index in December - Arnold, 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
Arnold, MO

Average cloud cover in December - Arnold, MO
  • Average cloud cover in December: 49

The month with the most cloud cover is January (Cloud cover 51).
The month with the least cloud cover is August (Cloud cover 28).

Average visibility in December
Arnold, MO

Average visibility in December - Arnold, 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).

Arnold, Missouri, USA

Weather forecast for your location

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