December weather forecastAlpharetta, GA
December
Weather in December
December in Alpharetta witnesses a full swing into winter, with temperatures fluctuating between 38.7°F (3.7°C) and 53.1°F (11.7°C). The consistent rise in rainfall from November readings results in fairly wet conditions. Reduced daylight and increased cloud cover confirms December's position as an overcast month. A relative increase in windspeed contributes to the wintry feel of the season. December is characterized by its chilly temperatures, establishing it as one of the coldest months in Alpharetta.Temperature
The commencement of December in Alpharetta indicates a gentle shift in the average high-temperature, receding from November's mild 60.1°F (15.6°C) to a cool 53.1°F (11.7°C). In December, the nighttime temperature in Alpharetta lowers to an average of 38.7°F (3.7°C).Humidity
December is the most humid month, with an average relative humidity of 78%.Rainfall
In December, in Alpharetta, the rain falls for 11.4 days. Throughout December, 2.09" (53mm) of precipitation is accumulated. In Alpharetta, during the entire year, the rain falls for 158.7 days and collects up to 26.06" (662mm) of precipitation.Snowfall
Months with snowfall in Alpharetta are January through March, November and December. In Alpharetta, Georgia, during December, snow falls for 0.8 days and regularly aggregates up to 0.51" (13mm) of snow. In Alpharetta, 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 in Alpharetta, Georgia, with an average of 9h and 54min of daylight.On the first day of the month, sunrise is at 7:25 am and sunset at 5:27 pm. On the last day of December, sunrise is at 7:42 am and sunset at 5:38 pm EST.
Sunshine
With an average of 5.1h of sunshine, December has the least sunshine of the year in Alpharetta.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index estimate of 2, and below, represents a minimal health vulnerability from exposure to the Sun's UV rays for ordinary individuals.Note: In December, an average UV index of 2 transforms into the following instructions:
While many people can endure lengthy sun exposure, it remains imperative to safeguard babies, children, and fair-skinned individuals. Direct exposure to the Sun during its peak hours around mid-day should be minimized for safety. For holistic sun protection encompassing the eyes, ears, face, and neck, a wide-brim hat is key. Warning! The reflection from snow can nearly magnify the Sun's UV radiation twofold.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
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).
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).
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).
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%).
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").
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).
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").
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).
Average daylight in December /
Average sunshine in December
Alpharetta, 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 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).
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).
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).
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).
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).
