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January Weather in Green Bay, United States

Last updated: June 24, 2025

In Green Bay, United States, the average temperature in January hovers around -6°C (21°F), with a chilling minimum of -31°C (-24°F) and a milder maximum reaching 9°C (49°F). Expect a total precipitation of 40 mm (1.6 in) spread over 7 days, contributing to an average humidity of a crisp 89%. Prepare for a brisk and wet month!

January Temperature in Green Bay

In January in Green Bay, the average temperature is -6°C (21°F). Maximum temperatures can reach 9°C (49°F), while minimums can dip as low as -31°C (-24°F). Travelers should be prepared for cold weather with a wide temperature range during this time.

January Weather in Green Bay: Daily Temperature Highs, Lows, and Averages

The chart illustrates January temperature patterns in Green Bay, showcasing daily minimum, maximum, and average temperatures. It highlights the typical range of temperatures throughout the month, providing insights into weather trends. In Green Bay, January typically has an average temperature of -6°C (21°F), with highs reaching up to 9°C (49°F) and lows dropping to around -31°C (-24°F).
JanFebMarAprMayJunJulAugSepOctNovDec212133435668737063503527
Data source: Temperature data for Green Bay generated using information from the Copernicus Climate Change Service.
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The average of daily temperatures (24 hours) calculated across all days in the month.

January Precipitation in Green Bay

In Green Bay in January, the precipitation amount is 40 mm (1.6 in) over a span of 7 days.

January Precipitation Trends in Green Bay

The chart displays monthly precipitation patterns in Green Bay, with values for each month alongside January’s data, which is highlighted for easy comparison. It shows the amount of precipitation, providing insights into how January’s conditions compare to those of other months. In Green Bay, January typically receives around 40 mm (1.6 inches) of precipitation spread over approximately 7 days.
JanFebMarAprMayJunJulAugSepOctNovDec4048599910610610810765944854
Data source: Precipitation data for January generated using information from the Copernicus Climate Change Service.
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January Humidity in Green Bay

In Green Bay in January, humidity is 89%. With an average temperature of -6°C (21°F), this humidity feels like an uncomfortable chill that seeps into your bones, making traveling outdoors an arduous task as the cold air mixes with dampness, often leaving you feeling cold and clammy despite layers of clothing.

January Average Humidity in Green Bay

This chart illustrates the average monthly humidity levels in Green Bay, with January’s data highlighted for easy comparison. It shows the fluctuation in humidity throughout the year, helping you understand how conditions vary by season. In January, average humidity in Green Bay is approximately 89%, offering insight into how humid the weather typically is during this month.
JanFebMarAprMayJunJulAugSepOctNovDec89%90%87%84%77%75%75%73%78%84%89%87%
Data source: Humidity data for January generated using information from the Copernicus Climate Change Service.

January UV Index in Green Bay

In Green Bay in January, the maximum UV index is 2, which corresponds to a low exposure category. With this level of UV radiation, the time to burn is approximately 45 minutes. To learn more about the hourly UV index in Green Bay, you can visit Hourly UV Index in Green Bay.

Maximum UV Index Levels in Green Bay for January

The chart shows the monthly maximum UV Index (UVI) for Green Bay in January, representing the highest UV radiation level. The UVI measures the intensity of ultraviolet radiation from the sun, indicating the potential risk of sunburn and UV-related health issues. In January, the maximum UV index in Green Bay typically reaches 2, which falls under the low exposure category.
JanFebMarAprMayJunJulAugSepOctNovDec2457910997532
Data source: Green Bay January UVI data generated using information from the Copernicus Climate Change Service.

UV Risk Categories

  •  Extreme (11+): Avoid the sun, stay in shade.
  •  Very High (8-10): Limit sun exposure.
  •  High (6-7): Use SPF 30+ and protective clothing.
  •  Moderate (3-5): Midday shade recommended.
  •  Low (0-2): No protection needed.

How January Weather in Green Bay Compares to Other Months

Weather in Green Bay varies notably across the year, with each month offering distinct climate conditions. This page compares January’s weather to other months in Green Bay, focusing on differences in temperature, rainfall, humidity, and UV levels.

This table compares monthly weather conditions in Green Bay, showing how January’s temperature, precipitation, humidity, and UV index levels differ from those of other months.
 TemperaturePrecipitationHumidityUV
January Weather-6°C (21°F)40 mm (1.6 inches)89%low
February Weather-6°C (21°F)48 mm (1.9 inches)90%moderate
March Weather1°C (33°F)59 mm (2.3 inches)87%moderate
April Weather6°C (43°F)99 mm (3.9 inches)84%high
May Weather14°C (57°F)106 mm (4.2 inches)77%very high
June Weather20°C (68°F)106 mm (4.2 inches)75%very high
July Weather23°C (73°F)108 mm (4.2 inches)74%very high
August Weather21°C (70°F)107 mm (4.2 inches)73%very high
September Weather17°C (63°F)65 mm (2.5 inches)78%high
October Weather10°C (50°F)94 mm (3.7 inches)84%moderate
November Weather2°C (35°F)48 mm (1.9 inches)89%moderate
December Weather-3°C (27°F)54 mm (2.1 inches)87%low

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