January weather forecast
Alpharetta, GA

Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
°Celsius°Fahrenheit
Share

Contents

Weather in January

January in Alpharetta, Georgia, greets the New Year with cool weather and chilly nights with temperatures fluctuating between 33.6°F (0.9°C) and 49.1°F (9.5°C). The climate sees a fair amount of rainfall, marking the onset of a soggy period, while a light dusting of snow is not uncommon. As the day progresses, the sun makes a fair appearance, offering a few hours of relief from the frosty morning. January's weather is characterized by relative humidity, indicating a substantial amount of moisture in the air. Compared to other months, the windspeed is high, providing a cool breeze throughout the day.

Temperature

With average high and low temperatures of 49.1°F (9.5°C) and 33.6°F (0.9°C) respectively, January is Alpharetta's coldest month.

Humidity

In Alpharetta, the average relative humidity in January is 74%.

Rainfall

In January, the rain falls for 10.3 days. Throughout January, 1.57" (40mm) of precipitation is accumulated. Throughout the year, in Alpharetta, there are 158.7 rainfall days, and 26.06" (662mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Alpharetta are January through March, November and December. The month with the most snowfall in Alpharetta is January, when snow falls for 1.3 days and typically aggregates up to 0.71" (18mm) of snow.

Daylight

The average length of the day in January in Alpharetta is 10h and 11min.
On the first day of the month, sunrise is at 7:42 am and sunset at 5:38 pm. On the last day of January, sunrise is at 7:35 am and sunset at 6:06 pm EST.

Sunshine

In January, the average sunshine is 5.6h.

UV index

January and December, with an average maximum UV index of 2, are months with the lowest UV index in Alpharetta. A UV Index of 2, and less, symbolizes a low health risk from unprotected exposure to Sun's UV rays for the ordinary person.
Note: A maximum UV index of 2 in January translates into the following recommendations:
While extended sun exposure does not significantly affect most people, those with sensitive skin, children, and infants should always be protected. Avoiding direct sun during mid-day hours can prevent harmful UV radiation exposure. Your best bet for sun defense on the face, eyes, and neck is a hat with a wide brim. Pay attention! The reflection of snow can enhance the Sun's UV radiation almost double.
[Resources]

Frequently asked questions

What are the coldest months in Alpharetta?

With an average high-temperature of 49.1°F (9.5°C) and an average low-temperature of 33.6°F (0.9°C), January is the coldest month.

What are January temperatures in Alpharetta?

January temperatures in Alpharetta vary between a high-temperature of 49.1°F (9.5°C) and a low-temperature of 33.6°F (0.9°C).

What is the average humidity in January in Alpharetta?

In January, the average relative humidity is 74%.

How much does it rain in Alpharetta in January?

In Alpharetta, during January, the rain falls for 10.3 days and regularly aggregates up to 1.57" (40mm) of precipitation.

What is the snowiest month in Alpharetta?

January is the month with the most snowfall in Alpharetta, Georgia. Snow falls for 1.3 days and accumulates 0.71" (18mm) of snow.

How much does it snow in Alpharetta in January?

In Alpharetta, in January, snow falls for 1.3 days, with typically accumulated 0.71" (18mm) of snow.

How many hours of daylight does Alpharetta have in January?

In Alpharetta, the average day length in January is 10h and 11min.

When is the sunrise / sunset in January in Alpharetta?

In January, on the first day of the month, sunrise is at 7:42 am and sunset at 5:38 pm. On the last day of the month, in Alpharetta, Georgia, sunrise is at 7:35 am and sunset at 6:06 pm EST.

How long on average sun shines in January in Alpharetta?

The average sunshine duration in January is 5.6h.

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

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

What is the UV index reading in January in Alpharetta?

In January, the average daily maximum UV index in Alpharetta is 2. A UV Index reading of 2, and below, represents a minimal health vulnerability from exposure to Sun's UV rays.
Today
Tomorrow
Long-term
YearJanuaryFMAMJJASOND
Dec
January
Feb
Average high temperature
53.1°F 11.7°C
49.1°F 9.5°C
54.1°F 12.3°C
Average low temperature
38.7°F 3.7°C
33.6°F 0.9°C
37.8°F 3.2°C
Average pressure
30.15" 766mmHg
30.16" 766mmHg
30.12" 765mmHg
Average wind speed
7.2mph 11.6km/h
7.8mph 12.6km/h
7.7mph 12.4km/h
Average max. wind speed
7.8mph 12.6km/h
8.4mph 13.5km/h
8.2mph 13.2km/h
Average wind speed gusts
11.4mph 18.3km/h
12.2mph 19.6km/h
11.9mph 19.2km/h
Average humidity
78%
74%
76%
Average rainfall
2.09" 53mm
1.57" 40mm
1.89" 48mm
Average rainfall days
11.4
10.3
11.2
Average snowfall
0.51" 13mm
0.71" 18mm
0.39" 10mm
Average snowfall days
0.8
1.3
1.5
Average daylight
9h 5min
10h 1min
11h 0min
Average sunshine
5h 1min
5h 4min
6h 2min
Average sunshine days
18.1
18.8
14.6
Average UV index
2
2
3
Average cloud cover
46%
43%
46%
Average visibility
6mi 9.7km
6mi 9.7km
6mi 9.7km

Average temperature in January
Alpharetta, GA

Average temperature in January - Alpharetta, GA
  • Average high temperature in January: 49.1°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 January: 33.6°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).

[Resources]

Average pressure in January
Alpharetta, GA

Average pressure in January - Alpharetta, 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).

[Resources]

Average wind speed in January
Alpharetta, GA

Average wind speed in January - Alpharetta, GA
  • Average wind speed in January: 7.8mph

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).

[Resources]

Average humidity in January
Alpharetta, GA

Average humidity in January - Alpharetta, GA
  • Average humidity in January: 74%

The month with the highest relative humidity is December (78%).
The months with the lowest relative humidity are July and August (69%).

[Resources]

Average rainfall in January
Alpharetta, GA

Average rainfall in January - Alpharetta, GA
  • Average rainfall in January: 1.57"

The wettest month (with the highest rainfall) is August (3.58").
The driest month (with the least rainfall) is October (1.34").

[Resources]

Average rainfall days in January
Alpharetta, GA

Average rainfall days in January - Alpharetta, GA
  • Average rainfall days in January: 10.3 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).

[Resources]

Average snowfall in January
Alpharetta, GA

Average snowfall in January - Alpharetta, GA
  • Average snowfall in January: 0.71"

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").

[Resources]

Average snowfall days in January
Alpharetta, GA

Average snowfall days in January - Alpharetta, GA
  • Average snowfall days in January: 1.3 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).

[Resources]

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

Average daylight in January / Average sunshine in January - Alpharetta, 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: 9h and 54min).

  • Average sunshine in January: 5h and 4min

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).

[Resources]

Average sunshine days in January
Alpharetta, GA

Average sunshine days in January - Alpharetta, GA
  • Average sunshine days in January: 18.8 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).

[Resources]

Average UV index in January
Alpharetta, GA

Average UV index in January - Alpharetta, GA
  • Average UV index in January: 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).

[Resources]

Average cloud cover in January
Alpharetta, GA

Average cloud cover in January - Alpharetta, GA
  • Average cloud cover in January: 43

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).

[Resources]

Average visibility in January
Alpharetta, GA

Average visibility in January - Alpharetta, 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).

[Resources]

Alpharetta, Georgia, USA

Weather forecast for today
Weather forecast for tomorrow
10 days weather forecast
Climate data
1January
2February
3March
4April
5May
6June
7July
8August
9September
10October
11November
12December

Weather forecast for your location

1. Click Locate me button
2. Allow the app to use your location