December weather forecast
Alpharetta, GA

Weather in December

The first month of the winter, December, is still a cool month in Alpharetta, Georgia, with an average temperature ranging between min 38.7°F (3.7°C) and max 53.1°F (11.7°C).

Temperature

In Alpharetta, the average high-temperature in December marginally drops from a mild 60.1°F (15.6°C) in November to a cool 53.1°F (11.7°C). In December, in Alpharetta, the average low-temperature is 38.7°F (3.7°C).

Humidity

The most humid month is December, with an average relative humidity of 78%.

Rainfall

In Alpharetta, in December, it is raining for 11.4 days, with typically 2.09" (53mm) of accumulated precipitation. Throughout the year, there are 158.7 rainfall days, and 26.06" (662mm) of precipitation is accumulated.

Snowfall

Months with snowfall are January through March, November and December. In Alpharetta, during 0.8 snowfall days, 0.51" (13mm) of snow is typically accumulated. In Alpharetta, Georgia, during the entire year, snow falls for 4.1 days and aggregates up to 1.77" (45mm) of snow.

Daylight

December has the shortest days of the year, with an average of 9h and 56min of daylight.
On the first day of December, sunrise is at 7:24 am and sunset at 5:27 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:37 pm EST.

Sunshine

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

UV index

The months with the lowest UV index in Alpharetta are January and December, with an average maximum UV index of 2. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to UV radiation for ordinary individuals.
Note: In December, the average maximum UV index of 2 translate into the following recommendations:
People with sensitive skin, children, and babies should always be protected from prolonged sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the temperature in December in Alpharetta?

In Alpharetta, Georgia, in December, the average high-temperature is 53.1°F (11.7°C), and the average low-temperature is 38.7°F (3.7°C). The average heat index (a.k.a. 'real feel', 'apparent temperature'), which represents the influence of relative humidity on air temperature, in September is calculated to be 89.6°F (32°C).

What is the most humid month in Alpharetta?

The most humid month in Alpharetta, Georgia, is December, with an average relative humidity of 78%.

What is the average humidity in December in Alpharetta?

In Alpharetta, Georgia, the average relative humidity in December is 78%.

How many days does it rain in December in Alpharetta?

In Alpharetta, Georgia, in December, it is raining for 11.4 days, with typically 2.09" (53mm) of accumulated precipitation.

How much does it snow in Alpharetta in December?

In December, in Alpharetta, it is snowing for 0.8 days. Throughout December, 0.51" (13mm) of snow is accumulated.

What is the month with the shortest days in Alpharetta?

The month with the shortest days is December, with an average of 9h and 56min of daylight.

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

In December, the average day length in Alpharetta is 9h and 56min.

What time are sunrise and sunset in December in Alpharetta?

On the first day of December in Alpharetta, Georgia, sunrise is at 7:24 am and sunset at 5:27 pm. On the last day of the month, sunrise is at 7:42 am and sunset at 5:37 pm EST.

What is the month with the least sunshine in Alpharetta?

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

How many hours of sunshine does Alpharetta have in December?

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

What is the month with the lowest UV index in Alpharetta?

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

How high is the UV index in December in Alpharetta?

In December, the average daily maximum UV index in Alpharetta is 2. A UV Index of 2, and less, symbolizes a low health threat from exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

Average temperature in December
Alpharetta, GA

Average temperature in December - Alpharetta, GA
  • Average high temperature in December: 53.1°F

The warmest month (with the highest average high temperature) is July (90°F).
The month with the lowest average high temperature is January (49.1°F).

  • Average low temperature in December: 38.7°F

The month with the highest average low temperature is July (70.3°F).
The coldest month (with the lowest average low temperature) is January (33.6°F).

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Average pressure in December
Alpharetta, GA

Average pressure in December - Alpharetta, 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
Alpharetta, GA

Average wind speed in December - Alpharetta, GA
  • Average wind speed in December: 7.2mph

The windiest month (with the highest average wind speed) is January (7.8mph).
The calmest month (with the lowest average wind speed) is August (4.5mph).

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Average humidity in December
Alpharetta, GA

Average humidity in December - Alpharetta, GA
  • Average humidity in December: 78%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are July and August (69%).

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Average rainfall in December
Alpharetta, GA

Average rainfall in December - Alpharetta, GA
  • Average rainfall in December: 2.09"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is October (1.34").

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Average rainfall days in December
Alpharetta, GA

Average rainfall days in December - Alpharetta, GA
  • Average rainfall days in December: 11.4 days

The month with the highest number of rainy days is July (18.8 days).
The month with the least rainy days is October (9 days).

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Average snowfall in December
Alpharetta, GA

Average snowfall in December - Alpharetta, GA
  • Average snowfall in December: 0.51"

The month with the highest snowfall is January (0.71").
The months with the least snowfall are April, May, June, July, August, September and October (0").

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Average snowfall days in December
Alpharetta, GA

Average snowfall days in December - Alpharetta, GA
  • Average snowfall days in December: 0.8 days

The month with the highest number of snowfall days is February (1.5 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
Alpharetta, GA

Average daylight in December / Average sunshine in December - Alpharetta, GA
  • Average daylight in December: 9h and 56min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in December: 5h and 6min

The month with the most sunshine is July (Average sunshine: 10h and 36min).
The month with the least sunshine is December (Average sunshine: 5h and 6min).

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Average sunshine days in December
Alpharetta, GA

Average sunshine days in December - Alpharetta, GA
  • Average sunshine days in December: 18.1 days

The month with the most sunshine days is October (20.5 days).
The month with the least sunshine days is July (10.1 days).

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Average UV index in December
Alpharetta, GA

Average UV index in December - Alpharetta, GA
  • 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 and December (UV index 2).

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Average cloud cover in December
Alpharetta, GA

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

The months with the most cloud cover are February and December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 30).

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Average visibility in December
Alpharetta, GA

Average visibility in December - Alpharetta, 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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