December weather forecastMarietta, GA
December
Weather in December
Concluding the year, December brings the chills back to the city of Marietta. Witnessing the first snowfall of the winter season, Marietta records an average of 0.67" (17mm) of snow. The progression from December to January results in a slight decrease in temperature. The city, dressed in a white blanket of snow, paints a holiday picture. Despite the cold, the winter sunshine brings a semblance of warmth to the chilly days.Temperature
The beginning of December brings a slight decrease in the average high-temperature, transitioning from a comfortable 61°F (16.1°C) in November to a fresh 53.6°F (12°C). During the month of December, an average temperature of 39°F (3.9°C) is noted during the nights.Humidity
December is the most humid month, with an average relative humidity of 78%.Rainfall
In December, the rain falls for 13.7 days. Throughout December, 3.78" (96mm) of precipitation is accumulated. Throughout the year, there are 177.1 rainfall days, and 41.93" (1065mm) of precipitation is accumulated.Snowfall
Months with snowfall are January through March and December. December is the first month it typically snows. Throughout December, in the average 0.8 snowfall days, it receives 0.67" (17mm) of snow. In Marietta, during the entire year, snow falls for 4.5 days and aggregates up to 2.6" (66mm) of snow.Daylight
The month with the shortest days is December, with an average of 9h and 54min of daylight.On the first day of December, sunrise is at 7:25 am and sunset at 5:29 pm. On the last day of the month, sunrise is at 7:43 am and sunset at 5:39 pm EST.
Sunshine
With an average of 5h of sunshine, December has the least sunshine of the year.UV index
January, February, November and December, with an average maximum UV index of 3, are months with the lowest UV index. A UV Index value of 3 to 5 symbolizes a moderate health risk from exposure to the Sun's UV radiation for the average person.Note: During December, 3 as the daily maximum UV index converts into the following advice:
Exercise caution. The susceptibility of light skin individuals to burns is less than 30 minutes. The Sun's UV radiation is especially harmful around midday, so reduce exposure and stay safe. To cut down UV radiation exposure by about half, sport a wide-brim hat. Take warning! The intensity of the Sun's UV radiation can be nearly amplified twice due to snow reflection.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
Average temperature in December
Marietta, GA
- Average high temperature in December: 53.6°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 (49.6°F).
- Average low temperature in December: 39°F
The month with the highest average low temperature is July (71.4°F).
The coldest month (with the lowest average low temperature) is January (34.2°F).
Average pressure in December
Marietta, 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).
Average wind speed in December
Marietta, GA
- Average wind speed in December: 7.5mph
The windiest month (with the highest average wind speed) is January (8.1mph).
The calmest months (with the lowest average wind speed) are July and August (4.7mph).
Average humidity in December
Marietta, GA
- Average humidity in December: 78%
The month with the highest relative humidity is December (78%).
The month with the lowest relative humidity is August (68%).
Average rainfall in December
Marietta, GA
- Average rainfall in December: 3.78"
The wettest month (with the highest rainfall) is August (4.88").
The driest month (with the least rainfall) is October (2.24").
Average rainfall days in December
Marietta, GA
- Average rainfall days in December: 13.7 days
The month with the highest number of rainy days is July (19.6 days).
The month with the least rainy days is November (9.5 days).
Average snowfall in December
Marietta, GA
- Average snowfall in December: 0.67"
The month with the highest snowfall is January (0.98").
The months with the least snowfall are April, May, June, July, August, September, October and November (0").
Average snowfall days in December
Marietta, GA
- Average snowfall days in December: 0.8 days
The month with the highest number of snowfall days is January (1.6 days).
The months with the least snowfall days are May, June, July, August, September and October (0 days).
Average daylight in December /
Average sunshine in December
Marietta, GA
- Average daylight in December: 9h and 54min
The month with the longest days is June (Average daylight: 14h and 24min).
The month with the shortest days is December (Average daylight: 9h and 54min).
- Average sunshine in December: 5h and 0min
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 0min).
Average sunshine days in December
Marietta, GA
- Average sunshine days in December: 15.7 days
The month with the most sunshine days is October (20.1 days).
The month with the least sunshine days is July (9.6 days).
Average UV index in December
Marietta, GA
- Average UV index in December: 3
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, November and December (UV index 3).
Average cloud cover in December
Marietta, GA
- Average cloud cover in December: 48
The month with the most cloud cover is December (Cloud cover 48).
The month with the least cloud cover is June (Cloud cover 31).
Average visibility in December
Marietta, 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).
