January weather forecast
Green Bay, WI

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

Weather in January

January, like December, is a freezing cold winter month in Green Bay, Wisconsin, with an average temperature ranging between min 12.4°F (-10.9°C) and max 22.6°F (-5.2°C).

Temperature

January is the coldest month, with an average high-temperature of 22.6°F (-5.2°C) and an average low-temperature of 12.4°F (-10.9°C).

Humidity

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

Rainfall

The month with the least rainfall 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 January, it is snowing for 15.9 days. Throughout January, 4.8" (122mm) of snow is accumulated. 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: 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.

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 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 estimate of 2, and below, represents a low threat to health from exposure to the Sun's UV rays for the ordinary person.
Note: In January, the average maximum UV index of 1 translate into the following recommendations:
Extended sun exposure is not an issue for the majority. Children, infants, and fair-skinned individuals always need to be protected. The solar radiation is most powerful near the mid-day, so the exposure to the direct Sun should be reduced accordingly. On bright days sunglasses that block both UVA and UVB rays should be worn. A hat with a wide brim is extremely helpful, as it can prevent roughly 50% of UV radiation from reaching the eyes. Caution! The reflection of snow can nearly double the intensity of the Sun's UV radiation.
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FAQ

What is the coldest month in Green Bay?

The coldest month in Green Bay is January, with an average high-temperature of 22.6°F (-5.2°C) and an average low-temperature of 12.4°F (-10.9°C).

What is the temperature in January in Green Bay?

The average high-temperature, in January, in Green Bay, is 22.6°F (-5.2°C), while 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 many days does it rain in January in Green Bay?

In Green Bay, in January, during 4.6 rainfall days, 1.18" (30mm) of precipitation is typically accumulated.

How much does it snow in Green Bay in January?

In Green Bay, in January, during 15.9 snowfall days, 4.8" (122mm) of snow is typically accumulated.

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 extremely cold, dangerous, and life-threatening. Unless suitably protected with insulated waterproof clothing, hypothermia quickly occurs.

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

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

When 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, sunrise is at 7:11 am and sunset at 4:59 pm CST.

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

In January, the average sunshine duration in Green Bay is 3.5h.

What is the month with the lowest UV index in Green Bay?

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

How high is the UV index in January in Green Bay?

In Green Bay, Wisconsin, the average daily maximum UV index in January is 1. A UV Index reading of 2, and below, represents a minimal hazard to health from unprotected exposure to UV radiation.
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
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 17min

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 30min

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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