December weather forecast
Decatur, GA

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Weather in December

The first month of the winter, December, is also a fresh month in Decatur, Georgia, with an average temperature varying between 39.7°F (4.3°C) and 53.8°F (12.1°C).

Temperature

Decatur experiences a moderate temperature shift at the start of December, with average high-temperatures adjusting a bit from an enjoyable 61.3°F (16.3°C) in November to a cool 53.8°F (12.1°C). During the month of December, an average temperature of 39.7°F (4.3°C) is noted during the nights in Decatur, Georgia.

Humidity

With an average relative humidity of 77%, December is the most humid month.

Rainfall

In Decatur, Georgia, in December, it is raining for 9.5 days, with typically 1.3" (33mm) of accumulated precipitation. In Decatur, during the entire year, the rain falls for 134.6 days and collects up to 14.72" (374mm) of precipitation.

Snowfall

January through March and December are months with snowfall. December is the first month it typically snows in Decatur. Throughout December, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow. Throughout the year, in Decatur, there are 2.3 snowfall days, and 0.59" (15mm) of snow is accumulated.

Daylight

The month with the shortest days in Decatur, Georgia, is December, with an average of 10h and 0min of daylight.
On the first day of December in Decatur, sunrise is at 7:24 am and sunset at 5:28 pm. On the last day of the month, sunrise is at 7:41 am and sunset at 5:39 pm EST.

Sunshine

December has the least sunshine of the year in Decatur, with an average of 5.1h of sunshine.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Decatur. A UV Index value of 2, and less, symbolizes a low threat to health from unprotected exposure to Sun's UV rays for average individuals.
Note: In December, the maximum UV index of 2 transforms into these recommendations:
Sun exposure does not present considerable issues for many, yet infants, fair-skinned people, and children necessitate constant protection. Protect yourself from the midday Sun's peak UV radiation by minimizing exposure. Always opt for UVA and UVB-resistant sunglasses on radiant days. Keep in mind! Snow's reflective quality can nearly double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the temperature in December in Decatur?

The high-temperature, in December, in Decatur, is 53.8°F (12.1°C), while the low-temperature averages to 39.7°F (4.3°C). In September, the average heat index (a.k.a. 'real feel', 'apparent temperature'), which calculates the temperature value influenced by the moisture in the air, is calculated to be 91.4°F (33°C).

What is the most humid month in Decatur?

December is the most humid month in Decatur, with an average relative humidity of 77%.

What is the average humidity in December in Decatur?

The average relative humidity in December in Decatur, Georgia, is 77%.

How much does it rain in Decatur in December?

In Decatur, in December, it is raining for 9.5 days, with typically 1.3" (33mm) of accumulated precipitation.

When does it start to snow in Decatur?

December is the first month it typically snows in Decatur. Throughout December, in the average 0.3 snowfall days, it receives 0.12" (3mm) of snow.

What is the month with the shortest days in Decatur?

The month with the shortest days in Decatur is December, with an average of 10h and 0min of daylight.

How many hours of daylight does Decatur have in December?

In Decatur, the average day length in December is 9h and 57min.

What time are sunrise and sunset in December in Decatur?

In December, on the first day of the month, sunrise is at 7:24 am and sunset at 5:28 pm. On the last day of the month, in Decatur, Georgia, sunrise is at 7:41 am and sunset at 5:39 pm EST.

What is the month with the least sunshine in Decatur?

With an average of 5.1h of sunshine, December has the least sunshine of the year in Decatur, Georgia.

How long on average sun shines in December in Decatur?

In Decatur, the average sunshine duration in December is 5.1h.

When is the lowest UV index in Decatur?

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

What is the UV index reading in December in Decatur?

In Decatur, Georgia, the average daily maximum UV index in December is 2. A UV Index value of 2, and less, symbolizes a minimal hazard to health from unprotected exposure to UV radiation.
Average humidity
Average rainfall days
Average snowfall
Average snowfall days
Average daylight
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Decatur, GA

Average temperature in December - Decatur, GA
  • Average high temperature in December: 53.8°F

The warmest month (with the highest average high temperature) is July (90.7°F).
The month with the lowest average high temperature is January (50.5°F).

  • Average low temperature in December: 39.7°F

The month with the highest average low temperature is July (71.6°F).
The coldest month (with the lowest average low temperature) is January (34.9°F).

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Average pressure in December
Decatur, GA

Average pressure in December - Decatur, GA
  • Average pressure in December: 30.15"Hg

The month with the highest atmospheric pressure is January (30.16"Hg).
The month with the lowest atmospheric pressure is June (29.99"Hg).

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Average wind speed in December
Decatur, GA

Average wind speed in December - Decatur, GA
  • Average wind speed in December: 7.5mph

The windiest month (with the highest average wind speed) is January (8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in December
Decatur, GA

Average humidity in December - Decatur, GA
  • Average humidity in December: 77%

The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are July and August (69%).

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Average rainfall in December
Decatur, GA

Average rainfall in December - Decatur, GA
  • Average rainfall in December: 1.3"

The wettest month (with the highest rainfall) is August (2.32").
The driest month (with the least rainfall) is September (0.55").

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Average rainfall days in December
Decatur, GA

Average rainfall days in December - Decatur, GA
  • Average rainfall days in December: 9.5 days

The month with the highest number of rainy days is August (17.1 days).
The month with the least rainy days is November (6.9 days).

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Average snowfall in December
Decatur, GA

Average snowfall in December - Decatur, GA
  • Average snowfall in December: 0.12"

The month with the highest snowfall is February (0.2").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").

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Average snowfall days in December
Decatur, GA

Average snowfall days in December - Decatur, GA
  • Average snowfall days in December: 0.3 days

The month with the highest number of snowfall days is February (0.9 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).

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

Average daylight in December / Average sunshine in December - Decatur, GA
  • Average daylight in December: 10h and 0min

The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 10h and 0min).

  • Average sunshine in December: 5h and 1min

The months with the most sunshine are June and July (Average sunshine: 10h and 42min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in December
Decatur, GA

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

The month with the most sunshine days is October (22.6 days).
The month with the least sunshine days is July (10.9 days).

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Average UV index in December
Decatur, GA

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

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

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Average cloud cover in December
Decatur, GA

Average cloud cover in December - Decatur, GA
  • Average cloud cover in December: 46

The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 29).

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Average visibility in December
Decatur, GA

Average visibility in December - Decatur, GA
  • 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).

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Decatur, Georgia, USA

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