Green Bay
Wisconsin, USA
Long-term weather forecast
Long-term weather forecast

January weather forecast and climate
Green Bay, WI

An aerial panorama of the sun setting over Green Bay in Wisconsin
An aerial panorama of the sun setting over Green Bay in Wisconsin
January, the same as December, in Green Bay, Wisconsin, is another subzero cold winter month, with average temperature fluctuating between 9°F (-12.8°C) and 24.3°F (-4.3°C).

Temperature

The coldest month is January, with an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 9°F (-12.8°C).

Humidity

The average relative humidity in January is 74%.

Rainfall

In Green Bay, during 9.9 rainfall days, 1.1" (28.7mm) of precipitation is typically accumulated. Throughout the year, in Green Bay, there are 123 rainfall days, and 29.5" (749.9mm) of precipitation is accumulated.

Snowfall

Months with snowfall in Green Bay are January through May, October through December. In Green Bay, in January, during 9.6 snowfall days, 13" (330.2mm) of snow is typically accumulated. Throughout the year, there are 40.2 snowfall days, and 51.4" (1305.6mm) of snow is accumulated.

Ocean temperature

In January, the average ocean temperature 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, the average length of the day is 9.3h.

Sunshine

The average sunshine in Green Bay is 4.7h.

UV index

Months with the lowest UV index in Green Bay are January and December, with an average maximum UV index of 1. A UV Index value of 2, and less, symbolizes a low health risk from unprotected exposure to the Sun's UV rays for the average person.
Note: The average daily UV index of 1 transform into the following instructions:
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. A wide-brim hat offers excellent sun protection for eyes, ears, face, and neck. Sunglasses with UVA and UVB protection significantly reduce eye damage from sun exposure. Tightly woven, loose-fitting clothes provide additional protection from the Sun. Beware! The strength of the UV rays is increased nearly double-fold by the reflection of the snow.

What is the coldest month in Green Bay?

With an average high-temperature of 24.3°F (-4.3°C) and an average low-temperature of 9°F (-12.8°C), January is the coldest month in Green Bay, Wisconsin.

What is the temperature in January in Green Bay?

In Green Bay, Wisconsin, in January, the average high-temperature is 24.3°F (-4.3°C), and the average low-temperature is 9°F (-12.8°C).

What is the average humidity in January in Green Bay?

In January, the average relative humidity in Green Bay, Wisconsin, is 74%.

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

In January, in Green Bay, Wisconsin, the rain falls for 9.9 days. Throughout January, 1.1" (28.7mm) of precipitation is accumulated.

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

In January, in Green Bay, it is snowing for 9.6 days. Throughout January, 13" (330.2mm) of snow is accumulated.

What is the ocean temperature in January in Green Bay?

In Green Bay, Wisconsin, 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.

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

In January, the average length of the day is 9.3h.

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

The average sunshine in January is 4.7h.

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

Months with the lowest UV index in Green Bay are January and December, with an average maximum UV index of 1.

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

The average daily maximum UV index in January in Green Bay is 1. A UV Index reading of 2, and below, represents a low health risk from unsafe exposure to the Sun's UV rays.
Average temperature in January - Green Bay, WI
  • Average high temperature in January: 24.3°F

The warmest month (with the highest average high temperature) is July (79.8°F).
The month with the lowest average high temperature is January (24.3°F).

  • Average low temperature in January: 9°F

The month with the highest average low temperature is July (58.4°F).
The coldest month (with the lowest average low temperature) is January (9°F).

Average humidity in January - Green Bay, WI
  • Average humidity in January: 74%

The month with the highest relative humidity is December (77.3%).
The month with the lowest relative humidity is May (65.9%).

Average rainfall in January - Green Bay, WI
  • Average rainfall in January: 1.1"

The wettest month (with the highest rainfall) is June (3.9").
Driest months (with the lowest rainfall) are January and February (1.1").

Average rainfall days in January - Green Bay, WI
  • Average rainfall days in January: 9.9 days

The month with the highest number of rainy days is May (11.4 days).
The month with the lowest number of rainy days is February (8.4 days).

Average snowfall in January - Green Bay, WI
  • Average snowfall in January: 13"

The month with the highest snowfall is December (13.1").
Months with the lowest snowfall are June, July, August and September (0").

Average snowfall days in January - Green Bay, WI
  • Average snowfall days in January: 9.6 days

The month with the highest number of snowfall days is January (9.6 days).
Months with the lowest number of snowfall days are June, July, August and September (0 days).

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).

Average daylight in January / Average sunshine in January - Green Bay, WI
  • Average daylight in January: 9.3h

The month with the longest days is June (Average daylight: 15.5h).
The month with shortest days is December (Average daylight: 8.9h).

  • Average sunshine in January: 4.7h

Months with most sunshine are June and July (Average sunshine: 10.1h).
Months with least sunshine are November and December (Average sunshine: 3.6).

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

Months with the highest UV index are June and July (UV index 8).
Months with the lowest UV index are January and December (UV index 1).