Green Bay has a humid continental climate , with some moderation due to the city’s proximity to Lake Michigan. Like other cities with this type of climate, there are four distinct seasons, often with severe or extreme variation between them in terms of temperature and precipitation. Green Bay experiences hot, humid summers and cold, snowy winters. The variance in temperature and precipitation between months is severe and often extreme. Tornadoes are rare in the Green Bay area, with the strongest being an F3 tornado that hit the community of Pittsfield on June 26, 1969.
Monthly mean temperatures range from 16.6 °F (−8.6 °C) in January to 69.1 °F (20.6 °C) in July. In July, the warmest month, the average high temperature is 81.2 °F (27.3 °C). There are 6.1 days of 90 °F (32 °C)+ highs, 68 days where the high remains at or below freezing, and 19 days with sub-0 °F (−18 °C) lows annually. From December to February, even during thaws, the temperature rarely reaches 50 °F (10 °C). Extremes have ranged from −36 °F (−38 °C) on January 21, 1888 to 104 °F (40 °C) on July 13, 1936.
The wettest month in Green Bay is August, when 3.77 inches (95.8 mm) of precipitation falls, mostly in the form of rainfall from thunderstorms. The driest month in Green Bay is February, when the majority of precipitation falls as low moisture-content snow due to cold, dry air. On average, 1.01 inches (25.7 mm) of precipitation falls in February.