December weather forecast
Decatur, AR

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Weather in December

The first month of the winter, December, is also a frosty month in Decatur, Arkansas, with an average temperature fluctuating between 32°F (0°C) and 46.6°F (8.1°C).

Temperature

December brings a drop in Decatur's average high-temperature, falling from a moderate 57°F (13.9°C) in November to a frosty 46.6°F (8.1°C). Nighttime temperature lowers to an average of 32°F (0°C) in December.

Humidity

The average relative humidity in December is 74%.

Rainfall

In Decatur, in December, during 8.7 rainfall days, 2.05" (52mm) of precipitation is typically accumulated. In Decatur, during the entire year, the rain falls for 139.7 days and collects up to 31.02" (788mm) of precipitation.

Snowfall

January through May, November and December are months with snowfall in Decatur. In Decatur, during December, snow falls for 2.6 days and regularly aggregates up to 0.63" (16mm) of snow. In Decatur, Arkansas, during the entire year, snow falls for 13.9 days and aggregates up to 4.8" (122mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 42min of daylight.
On the first day of December in Decatur, sunrise is at 7:11 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:13 pm CST.

Sunshine

January and December, with an average of 5.4h of sunshine, are months with the least sunshine.

UV index

The months with the lowest UV index are January and December, with an average maximum UV index of 2. 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, a regular UV index of 2 translates into these guidelines:
Children necessitate constant protection from sunlight, unlike the majority, who can remain under the sun for about an hour without burning. The midday Sun can be harmful due to its potent UV radiation; seek shade and reduce exposure. During bright days, sunglasses that offer UVA and UVB defense are recommended. Take note! UV radiation from the Sun can double in intensity due to snow reflection.
Updated: Jul 23, 2024
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate

Frequently asked questions

What are the temperatures in December?

An average high-temperature, in December, in Decatur, is 46.6°F (8.1°C) and the average low-temperature is 32°F (0°C). The average heat index (a.k.a. 'real feel', 'felt air temperature'), which represents the influence of relative humidity on air temperature, in September is evaluated at 86°F (30°C).

What is the average humidity in December?

In Decatur, the average relative humidity in December is 74%.

How much does it rain in December?

In Decatur, Arkansas, in December, it is raining for 8.7 days, with typically 2.05" (52mm) of accumulated precipitation.

How much does it snow in December?

In December, it is snowing for 2.6 days. Throughout December, 0.63" (16mm) of snow is accumulated.

What is the month with the shortest days?

December has the shortest days of the year in Decatur, with an average of 9h and 42min of daylight.

What is the average length of the day in December?

The average day length in December is 9h and 44min.

When are sunrise and sunset in December?

On the first day of December, sunrise is at 7:11 am and sunset at 5:02 pm. On the last day of the month, sunrise is at 7:29 am and sunset at 5:13 pm CST.

What is the month with the least sunshine?

The months with the least sunshine are January and December, with an average of 5.4h of sunshine.

How long on average sun shines in December?

The average sunshine duration in December is 5.4h.

What are the months with the lowest UV index?

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

What is the UV index reading in December?

In December, the average daily maximum UV index is 2. A UV Index of 2, and less, symbolizes 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
Decatur, AR

Average temperature in December - Decatur, AR
  • Average high temperature in December: 46.6°F

The warmest month (with the highest average high temperature) is July (90.5°F).
The month with the lowest average high temperature is January (44.4°F).

  • Average low temperature in December: 32°F

The month with the highest average low temperature is July (69.6°F).
The coldest month (with the lowest average low temperature) is January (28.4°F).

Average pressure in December
Decatur, AR

Average pressure in December - Decatur, AR
  • Average pressure in December: 30.14"Hg

The month with the highest atmospheric pressure is January (30.17"Hg).
The months with the lowest atmospheric pressure are April and June (29.93"Hg).

Average wind speed in December
Decatur, AR

Average wind speed in December - Decatur, AR
  • Average wind speed in December: 8.6mph

The windiest month (with the highest average wind speed) is April (10.4mph).
The calmest month (with the lowest average wind speed) is July (6.7mph).

Average humidity in December
Decatur, AR

Average humidity in December - Decatur, AR
  • Average humidity in December: 74%

The month with the highest relative humidity is May (77%).
The month with the lowest relative humidity is October (70%).

Average rainfall in December
Decatur, AR

Average rainfall in December - Decatur, AR
  • Average rainfall in December: 2.05"

The wettest month (with the highest rainfall) is May (4.37").
The driest month (with the least rainfall) is February (1.89").

Average rainfall days in December
Decatur, AR

Average rainfall days in December - Decatur, AR
  • Average rainfall days in December: 8.7 days

The month with the highest number of rainy days is May (15.5 days).
The months with the least rainy days are January and November (8.5 days).

Average snowfall in December
Decatur, AR

Average snowfall in December - Decatur, AR
  • Average snowfall in December: 0.63"

The month with the highest snowfall is February (1.46").
The months with the least snowfall are June, July, August, September and October (0").

Average snowfall days in December
Decatur, AR

Average snowfall days in December - Decatur, AR
  • Average snowfall days in December: 2.6 days

The month with the highest number of snowfall days is February (4.7 days).
The months with the least snowfall days are June, July, August and September (0 days).

Average daylight in December /
Average sunshine in December
Decatur, AR

Average daylight in December / Average sunshine in December - Decatur, AR
  • Average daylight in December: 9h and 4min

The month with the longest days is June (Average daylight: 14h and 36min).
The month with the shortest days is December (Average daylight: 9h and 42min).

  • Average sunshine in December: 5h and 2min

The month with the most sunshine is July (Average sunshine: 10h and 48min).
The months with the least sunshine are January and December (Average sunshine: 5h and 24min).

Average sunshine days in December
Decatur, AR

Average sunshine days in December - Decatur, AR
  • Average sunshine days in December: 19.2 days

The month with the most sunshine days is December (19.2 days).
The months with the least sunshine days are March and April (13.3 days).

Average UV index in December
Decatur, AR

Average UV index in December - Decatur, AR
  • Average UV index in December: 2

The month with the highest UV index is July (UV index 7).
The months with the lowest UV index are January and December (UV index 2).

Average cloud cover in December
Decatur, AR

Average cloud cover in December - Decatur, AR
  • Average cloud cover in December: 41

The months with the most cloud cover are February and March (Cloud cover 45).
The month with the least cloud cover is August (Cloud cover 24).

Average visibility in December
Decatur, AR

Average visibility in December - Decatur, AR
  • 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).

Decatur, Arkansas, USA

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