January weather forecast
Atlanta, IL

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Weather in January

January, the same as December, in Atlanta, Illinois, is a freezing cold winter month, with an average temperature fluctuating between 31.6°F (-0.2°C) and 19.8°F (-6.8°C).

Temperature

The coldest month is January, with an average high-temperature of 31.6°F (-0.2°C) and an average low-temperature of 19.8°F (-6.8°C).

Humidity

In Atlanta, the average relative humidity in January is 80%.

Rainfall

In January, in Atlanta, Illinois, the rain falls for 6.6 days. Throughout January, 0.98" (25mm) of precipitation is accumulated. Throughout the year, in Atlanta, Illinois, there are 135 rainfall days, and 17.72" (450mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Atlanta are January through April, November and December. January is the month with the most snowfall. Snow falls for 9.5 days and accumulates 2.2" (56mm) of snow.

Daylight

In Atlanta, the average length of the day in January is 9h and 41min.
On the first day of January in Atlanta, Illinois, sunrise is at 7:19 am and sunset at 4:41 pm. On the last day of the month, sunrise is at 7:06 am and sunset at 5:13 pm CST.

Sunshine

With an average of 4h of sunshine, January has the least sunshine of the year.

UV index

January, February, November and December, with an average maximum UV index of 2, are months with the lowest UV index in Atlanta. A UV Index estimate of 2, and below, represents a low threat to health from unsafe exposure to UV radiation for average individuals.
Note: The maximum UV index, 2 during January, leads to the following recommendations:
While most can endure approximately an hour in the sun without burning, children always require protection from sunlight. Avoid the Sun's strongest UV rays by seeking shade and limiting exposure during midday. To mitigate harm from sun exposure, pick sunglasses offering UVA and UVB defense. Take to heart! Snow reflection can almost magnify the Sun's UV radiation twofold.
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Frequently asked questions

What is the coldest month in Atlanta?

The coldest period in Atlanta is January, when temperatures fluctuate between an average high of 31.6°F (-0.2°C) and a low of 19.8°F (-6.8°C).

How cold is January in Atlanta?

In January, in Atlanta, the average high-temperature is 31.6°F (-0.2°C), and the average low-temperature is 19.8°F (-6.8°C).

What is the average humidity in January in Atlanta?

In Atlanta, Illinois, the average relative humidity in January is 80%.

How many days does it rain in January in Atlanta?

In Atlanta, during January, the rain falls for 6.6 days and regularly aggregates up to 0.98" (25mm) of precipitation.

When does it snow the most in Atlanta?

January is the month with the most snowfall in Atlanta, Illinois. Snow falls for 9.5 days and accumulates 2.2" (56mm) of snow.

How much does it snow in Atlanta in January?

In Atlanta, in January, snow falls for 9.5 days, with typically accumulated 2.2" (56mm) of snow.

How many hours of daylight does Atlanta have in January?

In Atlanta, Illinois, the average day length in January is 9h and 41min.

When are sunrise and sunset in January in Atlanta?

In January, on the first day of the month, sunrise is at 7:19 am and sunset at 4:41 pm. On the last day of the month, in Atlanta, Illinois, sunrise is at 7:06 am and sunset at 5:13 pm CST.

What is the month with the least sunshine in Atlanta?

With an average of 4h of sunshine, January has the least sunshine of the year in Atlanta.

How many hours of sunshine does Atlanta have in January?

In January, the average sunshine duration in Atlanta, Illinois, is 4h.

What is the month with the lowest UV index in Atlanta?

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

What is the UV index reading in January in Atlanta?

The average daily maximum UV index in January in Atlanta is 2. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
37.4°F 3°C
31.6°F -0.2°C
36.7°F 2.6°C
Average low temperature
27°F -2.8°C
19.8°F -6.8°C
23.5°F -4.7°C
Average pressure
30.12" 765mmHg
30.14" 766mmHg
30.12" 765mmHg
Average wind speed
9.9mph 15.9km/h
10.5mph 16.9km/h
10.5mph 16.9km/h
Average max. wind speed
10.6mph 17.1km/h
11.2mph 18km/h
11.1mph 17.9km/h
Average wind speed gusts
15.8mph 25.4km/h
16.6mph 26.7km/h
16.5mph 26.6km/h
Average humidity
79%
80%
79%
Average rainfall
0.87" 22mm
0.98" 25mm
0.98" 25mm
Average rainfall days
7.2
6.6
5.9
Average snowfall
0.91" 23mm
2.2" 56mm
1.93" 49mm
Average snowfall days
5.3
9.5
6.2
Average daylight
9h 2min
9h 4min
10h 4min
Average sunshine
4h 3min
4h 0min
4h 2min
Average sunshine days
20
18.8
16.8
Average UV index
2
2
2
Average cloud cover
53%
57%
54%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Atlanta, IL

Average temperature in January - Atlanta, IL
  • Average high temperature in January: 31.6°F

The warmest month (with the highest average high temperature) is July (81.5°F).
The month with the lowest average high temperature is January (31.6°F).

  • Average low temperature in January: 19.8°F

The month with the highest average low temperature is July (65.1°F).
The coldest month (with the lowest average low temperature) is January (19.8°F).

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Average pressure in January
Atlanta, IL

Average pressure in January - Atlanta, IL
  • Average pressure in January: 30.14"Hg

The month with the highest atmospheric pressure is January (30.14"Hg).
The month with the lowest atmospheric pressure is June (29.92"Hg).

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Average wind speed in January
Atlanta, IL

Average wind speed in January - Atlanta, IL
  • Average wind speed in January: 10.5mph

The windiest month (with the highest average wind speed) is April (10.6mph).
The calmest month (with the lowest average wind speed) is August (6.3mph).

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Average humidity in January
Atlanta, IL

Average humidity in January - Atlanta, IL
  • Average humidity in January: 80%

The month with the highest relative humidity is July (85%).
The month with the lowest relative humidity is October (70%).

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Average rainfall in January
Atlanta, IL

Average rainfall in January - Atlanta, IL
  • Average rainfall in January: 0.98"

The wettest month (with the highest rainfall) is May (2.2").
The driest month (with the least rainfall) is December (0.87").

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Average rainfall days in January
Atlanta, IL

Average rainfall days in January - Atlanta, IL
  • Average rainfall days in January: 6.6 days

The month with the highest number of rainy days is May (16.5 days).
The month with the least rainy days is February (5.9 days).

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Average snowfall in January
Atlanta, IL

Average snowfall in January - Atlanta, IL
  • Average snowfall in January: 2.2"

The month with the highest snowfall is January (2.2").
The months with the least snowfall are May, June, July, August, September and October (0").

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Average snowfall days in January
Atlanta, IL

Average snowfall days in January - Atlanta, IL
  • Average snowfall days in January: 9.5 days

The month with the highest number of snowfall days is January (9.5 days).
The months with the least snowfall days are May, June, July, August and September (0 days).

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Average daylight in January /
Average sunshine in January
Atlanta, IL

Average daylight in January / Average sunshine in January - Atlanta, IL
  • Average daylight in January: 9h and 4min

The month with the longest days is June (Average daylight: 15h and 0min).
The month with the shortest days is December (Average daylight: 9h and 24min).

  • Average sunshine in January: 4h and 0min

The month with the most sunshine is June (Average sunshine: 10h and 18min).
The month with the least sunshine is January (Average sunshine: 4h and 0min).

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Average sunshine days in January
Atlanta, IL

Average sunshine days in January - Atlanta, IL
  • Average sunshine days in January: 18.8 days

The months with the most sunshine days are November and December (20 days).
The month with the least sunshine days is May (11.6 days).

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Average UV index in January
Atlanta, IL

Average UV index in January - Atlanta, IL
  • Average UV index in January: 2

The months with the highest UV index are June, July and August (UV index 6).
The months with the lowest UV index are January, February, November and December (UV index 2).

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Average cloud cover in January
Atlanta, IL

Average cloud cover in January - Atlanta, IL
  • Average cloud cover in January: 57

The month with the most cloud cover is January (Cloud cover 57).
The month with the least cloud cover is September (Cloud cover 30).

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Average visibility in January
Atlanta, IL

Average visibility in January - Atlanta, IL
  • Average visibility in January: 6mi

The months with the highest visibility are January, February, March, April, May, June, September, October, November and December (6mi).
The months with the lowest visibility are July and August (5mi).

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Atlanta, Illinois, USA

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