Historical weather data, all-time temperature records, and monthly climate averages for Green Bay, WI. Explore typical weather conditions by week for trip planning, and see how today compares to the historical record.
April 5th in Green Bay sits right in that awkward shoulder season — the average high is only 48° with lows still dipping to 30°. There's a 42% chance of precipitation and a 13% chance it falls as snow, so don't put the scraper away yet. The date's range tells the whole story: it's hit 77° (1921) and 13° (1887) on this same calendar day.
Green Bay plays no games when it comes to extremes — the thermometer has swung from a brutal -36° in January 1888 to a scorching 104° in July 1936, a range of 140 degrees. That same brutal winter of 1888 also delivered a single-day snowfall of 24 inches, still the all-time record.
Summer is short but real in Green Bay, with late July peaking around 82° and the wettest stretch arriving in mid-June. By mid-January, average highs crater to 24°, making it one of the colder spots in the Upper Midwest. Plan warm-weather visits between late May and early September — everything else is a gamble.