January weather forecast
Green Bay, WI

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The sun setting over Green Bay in Wisconsin
The sun setting over Green Bay in Wisconsin

Weather in January

Green Bay, Wisconsin, witnesess some of its coldest days in January, as temperatures generally range from a low of 12.4°F (-10.9°C) to a high of 22.6°F (-5.2°C). With overcast skies being a common sight, the rays of sunshine are limited to an average of just 3.5 hours per day. The chilly winds with an average speed of 10.1mph (16.3km/h), only intensify the cold. Snowfall is frequent and at times heavy in January, making it a favorite month for winter enthusiasts who cherish the snowy landscapes.

Temperature

Green Bay reaches its lowest average temperatures in January, measuring 22.6°F (-5.2°C) at the peak and 12.4°F (-10.9°C) at the lowest.

Humidity

January is the most humid month in Green Bay, with an average relative humidity of 88%.

Rainfall

The month with the least rainfall in Green Bay is January, when the rain falls for 4.6 days and typically collects 1.18" (30mm) of precipitation.

Snowfall

January through May, October through December are months with snowfall. In Green Bay, during January, snow falls for 15.9 days and regularly aggregates up to 4.8" (122mm) of snow. In Green Bay, Wisconsin, during the entire year, snow falls for 63.7 days and aggregates up to 23.27" (591mm) of snow.

Ocean temperature

In Green Bay, the average seawater temperature in January is 37.8°F (3.2°C).
Note: In swimming scenarios, this situation is extremely cold, fraught with danger, and poses a significant life risk. Absent insulated waterproof clothing, hypothermia strikes quickly.

Daylight

In Green Bay, Wisconsin, the average length of the day in January is 9h and 17min.
On the first day of January in Green Bay, sunrise is at 7:28 am and sunset at 4:22 pm. On the last day of the month, sunrise is at 7:11 am and sunset at 4:59 pm CST.

Sunshine

The average sunshine in January in Green Bay is 3.5h.

UV index

January, February, November and December, with an average maximum UV index of 1, are months with the lowest UV index in Green Bay. A UV Index of 2, and less, symbolizes a minimal health vulnerability from unsafe exposure to UV radiation for ordinary individuals.
Note: The UV index of 1 in January translates into these instructions:
While most people can stay under the sun for an hour without burning, children must always be guarded against sun exposure. Minimize direct exposure to the Sun during midday when its radiation is at its peak. In the presence of strong sunlight, it's crucial to wear sunglasses that ward off UVA and UVB rays. Consider carefully! The reflective quality of snow can almost double the intensity of the Sun's UV radiation.
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Frequently asked questions

What is the coldest time of year in Green Bay?

The coldest period in Green Bay is January, when temperatures fluctuate between an average high of 22.6°F (-5.2°C) and a low of 12.4°F (-10.9°C).

How cold is it in Green Bay in January?

An average high-temperature, in January, in Green Bay, is 22.6°F (-5.2°C) and the average low-temperature is 12.4°F (-10.9°C).

What is the most humid month in Green Bay?

The most humid month in Green Bay, Wisconsin, is January, with an average relative humidity of 88%.

What is the average humidity in January in Green Bay?

In Green Bay, Wisconsin, the average relative humidity in January is 88%.

What is the driest month in Green Bay?

January is the month with the least rainfall. Rain falls for 4.6 days and accumulates 1.18" (30mm) of precipitation.

How much does it rain in Green Bay in January?

In Green Bay, Wisconsin, in January, it is raining for 4.6 days, with typically 1.18" (30mm) of accumulated precipitation.

How many days does it snow in January in Green Bay?

In Green Bay, in January, snow falls for 15.9 days, with typically accumulated 4.8" (122mm) of snow.

What is the ocean temperature in January in Green Bay?

In Green Bay, the average seawater temperature in January is 37.8°F (3.2°C). For swimming, this is considered very dangerous and immediately life-threatening. Total loss of breathing control instantly occurs, and clear thinking becomes almost impossible. A specialized swimsuit is obligatory to minimize thermal loss.

What is the average length of the day in January in Green Bay?

The average day length in January is 9h and 17min.

What time are sunrise and sunset in January in Green Bay?

In January, on the first day of the month, sunrise is at 7:28 am and sunset at 4:22 pm. On the last day of the month, in Green Bay, sunrise is at 7:11 am and sunset at 4:59 pm CST.

How many hours of sunshine does Green Bay have in January?

The average sunshine duration in January in Green Bay is 3.5h.

What are the months with the lowest UV index in Green Bay?

The months with the lowest UV index in Green Bay are January, February, November and December, with an average maximum UV index of 1.

What is the UV index intensity in January in Green Bay?

In January, the average daily maximum UV index in Green Bay, Wisconsin, is 1. A UV Index reading of 2, and below, represents a low health risk from 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
Green Bay, WI

Average temperature in January - Green Bay, WI
  • Average high temperature in January: 22.6°F

The warmest month (with the highest average high temperature) is July (78.1°F).
The month with the lowest average high temperature is January (22.6°F).

  • Average low temperature in January: 12.4°F

The month with the highest average low temperature is July (60.4°F).
The coldest month (with the lowest average low temperature) is January (12.4°F).

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Average pressure in January
Green Bay, WI

Average pressure in January - Green Bay, WI
  • Average pressure in January: 30.08"Hg

The month with the highest atmospheric pressure is March (30.09"Hg).
The month with the lowest atmospheric pressure is June (29.91"Hg).

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Average wind speed in January
Green Bay, WI

Average wind speed in January - Green Bay, WI
  • Average wind speed in January: 10.1mph

The windiest months (with the highest average wind speed) are January and February (10.1mph).
The calmest months (with the lowest average wind speed) are July and August (7.2mph).

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Average humidity in January
Green Bay, WI

Average humidity in January - Green Bay, WI
  • Average humidity in January: 88%

The month with the highest relative humidity is January (88%).
The months with the lowest relative humidity are April and May (76%).

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Average rainfall in January
Green Bay, WI

Average rainfall in January - Green Bay, WI
  • Average rainfall in January: 1.18"

The wettest month (with the highest rainfall) is May (3.31").
The driest month (with the least rainfall) is January (1.18").

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Average rainfall days in January
Green Bay, WI

Average rainfall days in January - Green Bay, WI
  • Average rainfall days in January: 4.6 days

The month with the highest number of rainy days is May (15.9 days).
The month with the least rainy days is February (3.7 days).

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Average snowfall in January
Green Bay, WI

Average snowfall in January - Green Bay, WI
  • Average snowfall in January: 4.8"

The month with the highest snowfall is February (5.79").
The months with the least snowfall are June, July, August and September (0").

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Average snowfall days in January
Green Bay, WI

Average snowfall days in January - Green Bay, WI
  • Average snowfall days in January: 15.9 days

The month with the highest number of snowfall days is January (15.9 days).
The months with the least snowfall days are June, July, August and September (0 days).

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Average sea temperature in January
Green Bay, WI

Average sea temperature in January - Green Bay, WI
  • Average sea temperature in January: 37.8°F

The best month for swimming (with the highest average sea temperature) is August (67.6°F).
The coldest month (with the lowest average sea temperature) is February (36.1°F).

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Average daylight in January /
Average sunshine in January
Green Bay, WI

Average daylight in January / Average sunshine in January - Green Bay, WI
  • Average daylight in January: 9h and 2min

The month with the longest days is June (Average daylight: 15h and 30min).
The month with the shortest days is December (Average daylight: 8h and 54min).

  • Average sunshine in January: 3h and 3min

The month with the most sunshine is July (Average sunshine: 10h and 6min).
The month with the least sunshine is February (Average sunshine: 3h and 24min).

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Average sunshine days in January
Green Bay, WI

Average sunshine days in January - Green Bay, WI
  • Average sunshine days in January: 13.2 days

The months with the most sunshine days are September and November (17 days).
The month with the least sunshine days is April (11.6 days).

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Average UV index in January
Green Bay, WI

Average UV index in January - Green Bay, WI
  • Average UV index in January: 1

The months with the highest UV index are June, July and August (UV index 5).
The months with the lowest UV index are January, February, November and December (UV index 1).

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Average cloud cover in January
Green Bay, WI

Average cloud cover in January - Green Bay, WI
  • Average cloud cover in January: 65

The month with the most cloud cover is January (Cloud cover 65).
The months with the least cloud cover are July and August (Cloud cover 33).

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Average visibility in January
Green Bay, WI

Average visibility in January - Green Bay, WI
  • Average visibility in January: 5mi

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

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Green Bay, Wisconsin, USA

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