December weather forecast
Saint Marys, GA

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Weather in December

December welcomes winter with a significant drop in temperature. There's an increase in cloud coverage from November, lending to gloomier skies. The humidity continues to rise, albeit the month receives less rainfall. As the end of the year approaches, Saint Marys experiences the colder side of the spectrum with temperatures swinging from 52.5°F (11.4°C) to 65.5°F (18.6°C).

Temperature

December reports an average high-temperature of a comfortable 65.5°F (18.6°C), slightly varied from November's 70.7°F (21.5°C). An average low-temperature of 52.5°F (11.4°C) is noted during the nights in December.

Humidity

August and December, with an average relative humidity of 77%, are the most humid months in Saint Marys.

Rainfall

In Saint Marys, during December, the rain falls for 9 days and regularly aggregates up to 1.1" (28mm) of precipitation. Throughout the year, in Saint Marys, Georgia, there are 165.4 rainfall days, and 23.15" (588mm) of precipitation is accumulated.

Snowfall

January, March through December are months without snowfall in Saint Marys.

Daylight

The month with the shortest days is December, with an average of 10h and 12min of daylight.
On the first day of the month, sunrise is at 7:06 am and sunset at 5:24 pm. On the last day of December, in Saint Marys, sunrise is at 7:23 am and sunset at 5:35 pm EST.

Sunshine

December has the least sunshine of the year in Saint Marys, Georgia, with an average of 5.8h of sunshine.

UV index

The months with the lowest UV index in Saint Marys are January and December, with an average maximum UV index of 4. A UV Index reading of 3 to 5 represents a medium health hazard from unprotected exposure to Sun's UV rays for the average person.
Note: An average maximum UV index of 4 in December leads to these recommendations:
Exercise care. People with light skin might get burns in fewer than 30 minutes. Around midday, solar radiation is most harmful; hence, exposure should be limited. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key.
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Frequently asked questions

What is the usual temperature for Saint Marys in December?

Saint Marys in December has an average high-temperature of 65.5°F (18.6°C) and an average low-temperature of 52.5°F (11.4°C). The average heat index (a.k.a. 'felt air temperature', 'real feel'), which calculates the temperature value influenced by the moisture in the air, in September is estimated at 96.8°F (36°C).

What are the most humid months in Saint Marys?

August and December, with an average relative humidity of 77%, are most humid months.

What is the average humidity in December in Saint Marys?

The average relative humidity in December in Saint Marys is 77%.

How many days does it rain in December in Saint Marys?

In Saint Marys, in December, it is raining for 9 days, with typically 1.1" (28mm) of accumulated precipitation.

When it does not snow in Saint Marys?

In Saint Marys, snow does not fall in January, March through December.

What is the month with the shortest days in Saint Marys?

December has the shortest days of the year, with an average of 10h and 12min of daylight.

What is the average length of the day in December in Saint Marys?

The average day length in December in Saint Marys is 10h and 12min.

When is the sunrise / sunset in December in Saint Marys?

In December, on the first day of the month, sunrise is at 7:06 am and sunset at 5:24 pm. On the last day of the month, in Saint Marys, Georgia, sunrise is at 7:23 am and sunset at 5:35 pm EST.

What is the month with the least sunshine in Saint Marys?

December has the least sunshine of the year, with an average of 5.8h of sunshine.

How many hours of sunshine does Saint Marys have in December?

In Saint Marys, the average sunshine duration in December is 5.8h.

What are the months with the lowest UV index in Saint Marys?

January and December, with an average maximum UV index of 4, are months with the lowest UV index.

What is the UV index reading in December in Saint Marys?

In December, the average daily maximum UV index in Saint Marys, Georgia, is 4. A UV Index estimate of 3 to 5 represents a moderate 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
Saint Marys, GA

Average temperature in December - Saint Marys, GA
  • Average high temperature in December: 65.5°F

The warmest month (with the highest average high temperature) is July (90.1°F).
The month with the lowest average high temperature is January (61.5°F).

  • Average low temperature in December: 52.5°F

The month with the highest average low temperature is August (76.8°F).
The coldest month (with the lowest average low temperature) is January (47.7°F).

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Average pressure in December
Saint Marys, GA

Average pressure in December - Saint Marys, GA
  • Average pressure in December: 30.12"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The months with the lowest atmospheric pressure are June, August and September (29.98"Hg).

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Average wind speed in December
Saint Marys, GA

Average wind speed in December - Saint Marys, GA
  • Average wind speed in December: 7.3mph

The windiest month (with the highest average wind speed) is April (7.6mph).
The calmest months (with the lowest average wind speed) are July and August (6mph).

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Average humidity in December
Saint Marys, GA

Average humidity in December - Saint Marys, GA
  • Average humidity in December: 77%

The months with the highest relative humidity are August and December (77%).
The month with the lowest relative humidity is March (71%).

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Average rainfall in December
Saint Marys, GA

Average rainfall in December - Saint Marys, GA
  • Average rainfall in December: 1.1"

The wettest month (with the highest rainfall) is August (3.9").
The driest month (with the least rainfall) is January (0.67").

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Average rainfall days in December
Saint Marys, GA

Average rainfall days in December - Saint Marys, GA
  • Average rainfall days in December: 9 days

The month with the highest number of rainy days is August (23.9 days).
The month with the least rainy days is February (8.3 days).

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Average snowfall days in December
Saint Marys, GA

Average snowfall days in December - Saint Marys, GA
  • Average snowfall days in December: 0 days

The month with the highest number of snowfall days is February (0.1 days).
The months with the least snowfall days are January, March, April, May, June, July, August, September, October, November and December (0 days).

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Average daylight in December /
Average sunshine in December
Saint Marys, GA

Average daylight in December / Average sunshine in December - Saint Marys, GA
  • Average daylight in December: 10h and 1min

The month with the longest days is June (Average daylight: 14h and 6min).
The month with the shortest days is December (Average daylight: 10h and 12min).

  • Average sunshine in December: 5h and 5min

The month with the most sunshine is July (Average sunshine: 10h and 54min).
The month with the least sunshine is December (Average sunshine: 5h and 48min).

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Average sunshine days in December
Saint Marys, GA

Average sunshine days in December - Saint Marys, GA
  • Average sunshine days in December: 19.4 days

The month with the most sunshine days is January (20.8 days).
The month with the least sunshine days is August (4.5 days).

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Average UV index in December
Saint Marys, GA

Average UV index in December - Saint Marys, GA
  • Average UV index in December: 4

The months with the highest UV index are May, June, July and August (UV index 7).
The months with the lowest UV index are January and December (UV index 4).

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Average cloud cover in December
Saint Marys, GA

Average cloud cover in December - Saint Marys, GA
  • Average cloud cover in December: 39

The month with the most cloud cover is December (Cloud cover 39).
The month with the least cloud cover is May (Cloud cover 27).

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Average visibility in December
Saint Marys, GA

Average visibility in December - Saint Marys, 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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Saint Marys, Georgia, USA

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