January weather forecast
Decatur, GA

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Weather in January

January, like December, in Decatur, Georgia, is another fresh winter month, with an average temperature fluctuating between 34.9°F (1.6°C) and 50.5°F (10.3°C).

Temperature

With average temperatures fluctuating between a high of 50.5°F (10.3°C) and a low of 34.9°F (1.6°C), January stands out as the coldest month.

Humidity

In Decatur, the average relative humidity in January is 73%.

Rainfall

In January, the rain falls for 8.4 days. Throughout January, 1.02" (26mm) of precipitation is accumulated. In Decatur, during the entire year, the rain falls for 134.6 days and collects up to 14.72" (374mm) of precipitation.

Snowfall

Months with snowfall are January through March and December. In January, it is snowing for 0.6 days. Throughout January, 0.16" (4mm) of snow is accumulated. Throughout the year, there are 2.3 snowfall days, and 0.59" (15mm) of snow is accumulated.

Daylight

In Decatur, 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, in Decatur, sunrise is at 7:34 am and sunset at 6:06 pm EST.

Sunshine

In January, the average sunshine in Decatur is 5.8h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Decatur. A UV Index estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: The daily high UV index of 2 in January translates into this advice:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. Boost your sun resistance with garments that are densely woven yet spacious. Be attentive! The reflective property of snow can nearly double the Sun's UV radiation.
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Frequently asked questions

What month is the coldest in Decatur?

In Decatur, the average lowest temperatures are observed in January, with a high of 50.5°F (10.3°C) and a low of 34.9°F (1.6°C).

What are January temperatures in Decatur?

The high-temperature, in January, in Decatur, is 50.5°F (10.3°C), while the low-temperature averages to 34.9°F (1.6°C).

What is the average humidity in January in Decatur?

The average relative humidity in January is 73%.

How much does it rain in Decatur in January?

In January, in Decatur, the rain falls for 8.4 days. Throughout January, 1.02" (26mm) of precipitation is accumulated.

How many days does it snow in January in Decatur?

In January, in Decatur, it is snowing for 0.6 days. Throughout January, 0.16" (4mm) of snow is accumulated.

What is the average length of the day in January in Decatur?

In January, the average day length is 10h and 13min.

When are sunrise and sunset in January in Decatur?

In January, on the first day of the month, sunrise is at 7:41 am and sunset at 5:39 pm. On the last day of the month, in Decatur, sunrise is at 7:34 am and sunset at 6:06 pm EST.

How many hours of sunshine does Decatur have in January?

The average sunshine duration in January in Decatur is 5.8h.

When is the lowest UV index in Decatur?

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

How high is the UV index in January in Decatur?

In Decatur, Georgia, the average daily maximum UV index in January is 2. A UV Index value of 2, and less, symbolizes a low health risk from unsafe exposure to Sun's UV rays.
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 January
Decatur, GA

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).

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Average pressure in January
Decatur, GA

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).

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Average wind speed in January
Decatur, GA

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).

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Average humidity in January
Decatur, GA

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%).

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Average rainfall in January
Decatur, GA

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").

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Average rainfall days in January
Decatur, GA

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).

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Average snowfall in January
Decatur, GA

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").

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Average snowfall days in January
Decatur, GA

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).

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Average daylight in January /
Average sunshine in January
Decatur, GA

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).

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Average sunshine days in January
Decatur, GA

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).

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Average UV index in January
Decatur, GA

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).

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Average cloud cover in January
Decatur, GA

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).

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Average visibility in January
Decatur, GA

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).

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Decatur, Georgia, USA

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