January weather forecast
Alpharetta, GA

Weather in January

January, the same as December, in Alpharetta, Georgia, is a frosty winter month, with temperature in the range of an average low of 33.6°F (0.9°C) and an average high of 49.1°F (9.5°C).

Temperature

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.

Humidity

In January, the average relative humidity is 74%.

Rainfall

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

Snowfall

January through March, November and December are months with snowfall. January is the month with the most snowfall in Alpharetta. Snow falls for 1.3 days and accumulates 0.71" (18mm) of snow.

Daylight

The average length of the day in January in Alpharetta, Georgia, 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 7:34 am and sunset at 6:06 pm EST.

Sunshine

In Alpharetta, the average sunshine in January 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 threat to health from unsafe exposure to UV radiation for the average person.
Note: In January, the average maximum UV index of 2 translate into the following recommendations:
Most people can stay in the Sun for up to 1 hour without burning, apart from children that always must be protected from sun exposure. The Sun's most intense and consequently most harmful UV radiation during midday hours should be decreased by minimizing exposure and seeking shade. Sun-protective clothing, a long-sleeved shirt and pants, a wide-brimmed hat, and UVA and UVB-blocking sunglasses are particularly helpful in blocking UV radiation's harmful effects. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.
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FAQ

What is the coldest month in Alpharetta?

January is the coldest month 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).

What is the temperature in January in Alpharetta?

In Alpharetta, Georgia, in January, the average high-temperature is 49.1°F (9.5°C), and the average low-temperature is 33.6°F (0.9°C).

What is the average humidity in January in Alpharetta?

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

How much does it rain in Alpharetta in January?

In Alpharetta, in January, during 10.3 rainfall days, 1.57" (40mm) of precipitation is typically accumulated.

What is the snowiest month in Alpharetta?

The month with the most snowfall is January, when snow falls for 1.3 days and typically aggregates up to 0.71" (18mm) of snow.

How many days does it snow in January in Alpharetta?

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

What time are sunrise and sunset in January in Alpharetta?

On the first day of January in Alpharetta, sunrise is at 7:42 am and sunset at 5:38 pm. On the last day of the month, sunrise is at 7:34 am and sunset at 6:06 pm EST.

How long on average sun shines in January in Alpharetta?

In January, the average sunshine duration in Alpharetta is 5.6h.

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

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

What is the UV index reading in January in Alpharetta?

In Alpharetta, Georgia, the average daily maximum UV index in January is 2. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to Sun's UV rays.
Average humidity
Average rainfall days
Average snowfall days
Average sunshine
Average sunshine days
Average UV index
Average cloud cover
Average visibility

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).

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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).

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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).

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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%).

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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").

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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).

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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").

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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).

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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 11min

The month with the longest days is June (Average daylight: 14h and 23min).
The month with the shortest days is December (Average daylight: 9h and 56min).

  • Average sunshine in January: 5h and 36min

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).

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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).

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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).

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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).

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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).

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