If you're looking for summer vibes, the best time to travel to Green Bay, WI is in July, June and August, when the average temperature reaches 20.56 °C, while July, August and May are the 3 sunniest months of the year, with an average of 133.41 hours.
However, if you prefer colder temperatures, make sure you visit Green Bay, WI during January, February or March to experience an average of -7.17 °C.
For those who don't care too much about temperatures, but want to avoid getting wet in the rain, it's important to avoid travelling during January, February and March, when the average precipitation in Green Bay, WI is 5.25 mm, while the months of January, February and March are drier, with an average of 0 mm.