Contents
- Weather in January
- Frequently asked questions
- Average temperature in January
- Average pressure in January
- Average wind speed in January
- Average humidity in January
- Average rainfall in January
- Average rainfall days in January
- Average snowfall in January
- Average snowfall days in January
- Average daylight in January
- Average sunshine in January
- Average sunshine days in January
- Average UV index in January
- Average cloud cover in January
- Average visibility in January
Weather in January
Temperature
January brings the lowest temperatures, with an average high of 50.5°F (10.3°C) and an average low of 34.9°F (1.6°C).Humidity
In January, the average relative humidity is 73%.Rainfall
In Decatur, in January, it is raining for 8.4 days, with typically 1.02" (26mm) of accumulated precipitation. Throughout the year, there are 134.6 rainfall days, and 14.72" (374mm) of precipitation is accumulated.Snowfall
January through March and December are months with snowfall. In Decatur, in January, snow falls for 0.6 days, with typically accumulated 0.16" (4mm) of snow. Throughout the year, there are 2.3 snowfall days, and 0.59" (15mm) of snow is accumulated.Daylight
The average length of the day in January is 10h and 13min.On the first day of the month, sunrise is at 7:41 am and sunset at 5:39 pm. On the last day of January, sunrise is at 7:34 am and sunset at 6:06 pm EST.
Sunshine
In Decatur, the average sunshine in January is 5.8h.UV index
January and December, with an average maximum UV index of 2, are months with the lowest UV index. A UV Index value of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for average individuals.Note: In January, the maximum UV index of 2 suggests this advice:
Although prolonged sun exposure does not typically bother most people, children, babies, and those with sensitive skin should always have protection. The most potent solar radiation is around mid-day, so one should minimize exposure to direct sunlight during this period. Outfit yourself in sun-safe attire, like long sleeves, pants, a hat, and UV-blocking sunglasses. Be watchful! The reflection of snow can enhance the intensity of the Sun's UV radiation nearly double.
Published by: Weather U.S. | About Us
Data Sources | Weather Forecasting & Climate
Frequently asked questions
What time of the year is the coldest?
What are the temperatures in January?
What is the average humidity in January?
How many days does it rain in January?
How much does it snow in January?
How many hours of daylight does Decatur have in January?
When is the sunrise / sunset in January?
How many hours of sunshine does Decatur have in January?
What are the months with the lowest UV index?
How high is the UV index in January in Decatur?
Average temperature in January
Decatur, GA
- Average high temperature in January: 50.5°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 January: 34.9°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).
Average pressure in January
Decatur, GA
- Average pressure in January: 30.16"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 January
Decatur, GA
- Average wind speed in January: 8mph
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).
Average humidity in January
Decatur, GA
- Average humidity in January: 73%
The month with the highest relative humidity is December (77%).
The months with the lowest relative humidity are July and August (69%).
Average rainfall in January
Decatur, GA
- Average rainfall in January: 1.02"
The wettest month (with the highest rainfall) is August (2.32").
The driest month (with the least rainfall) is September (0.55").
Average rainfall days in January
Decatur, GA
- Average rainfall days in January: 8.4 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).
Average snowfall in January
Decatur, GA
- Average snowfall in January: 0.16"
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").
Average snowfall days in January
Decatur, GA
- Average snowfall days in January: 0.6 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).
Average daylight in January /
Average sunshine in January
Decatur, GA
- Average daylight in January: 10h and 1min
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 January: 5h and 5min
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).
Average sunshine days in January
Decatur, GA
- Average sunshine days in January: 20.8 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).
Average UV index in January
Decatur, GA
- Average UV index in January: 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).
Average cloud cover in January
Decatur, GA
- Average cloud cover in January: 42
The month with the most cloud cover is December (Cloud cover 46).
The month with the least cloud cover is June (Cloud cover 29).
Average visibility in January
Decatur, GA
- Average visibility in January: 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).
Decatur, Georgia, USA
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