Green Bay Average Temperature by Month

This page shows the average temperature in each month of the year in Green Bay, Wisconsin. It is based on NOAA data for the years 1991–2020.
What's the Hottest Month in Green Bay?
In Green Bay, Wisconsin, the warmest month is July, with an average daily high temperature of 81.1 °F and an average low of 59.5 °F.
What's the Coldest Month in Green Bay?
In Green Bay, Wisconsin, the coolest month is January, with an average daily high temperature of 25.6 °F and an average low of 10.5 °F.
Month Avg. High Avg. Low
January 25.6 °F 10.5 °F
February 29.1 °F 12.7 °F
March 40.5 °F 23.3 °F
April 53.9 °F 34.3 °F
May 67.3 °F 45.5 °F
June 76.7 °F 55.7 °F
July 81.1 °F 59.5 °F
August 79.0 °F 57.6 °F
September 71.9 °F 49.6 °F
October 58.1 °F 38.9 °F
November 43.6 °F 28.3 °F
December 31.2 °F 17.3 °F
Year 55.0 °F 36.2 °F
Weather Station Details
Years Station Coordinates
1886–2024 Green Bay location
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