How extreme does Green Bay's weather get?

The hottest, coldest, wettest and snowiest days Green Bay has recorded — the outer limits of what its weather can do, and how far they sit beyond a normal day.

Based on 27 years of daily weather observations (1999–present), from the Green Bay Botanical station 6 km away. Updated through February 2026 — an all-time extreme only changes when a more extreme day actually occurs, so some dates are old. That is normal, not stale data.

The four kinds of extreme

The hottest, coldest, wettest and snowiest single days Green Bay has recorded — each shown against what a normal day that time of year looks like.

🔥 Hottest day

99°F Aug 8, 2001

That is about 21°F hotter than a normal August afternoon in Green Bay (typical high near 78°F).

The three most extreme on record

1 99°F Aug 8, 2001

2 97°F Aug 9, 2001

3 97°F Jul 22, 2002

❄️ Coldest night

-26°F Jan 30, 2019

About 35°F colder than a normal January night in Green Bay (typical low near 9°F).

The three most extreme on record

1 -26°F Jan 30, 2019

2 -26°F Jan 31, 2019

3 -26°F Feb 1, 2019

🌧️ Most rain in one day

4.50 in Jul 8, 2000

More rain in a single day than Green Bay usually gets in the whole month of July (typical July total about 3.7 in).

The three most extreme on record

1 4.50 in Jul 8, 2000

2 3.72 in Aug 8, 2021

3 3.41 in May 18, 2020

⛄ Most snow in one day

15.0 in Dec 9, 2009

The three most extreme on record

1 15.0 in Dec 9, 2009

2 14.0 in Dec 29, 2015

3 12.0 in Feb 21, 2011

How hot and cold it gets, month by month

The shaded band is the normal range of daily temperatures for each month. The dots show the most extreme it has ever been — so you can see how far beyond a normal day the records really sit.

normal range of daily temperatureshottest ever recordedcoldest ever recorded

Green Bay's record heat sits well above even a hot day for the season — August's 99°F is about 21°F beyond a normal hot afternoon. Its record cold is just as far below a normal winter night — the dots mark how rare each extreme really is.

In plain terms

In a normal year, Green Bay's warmest days reach the low 80s°F and its coldest nights drop to the high 0s°F. But across the record it has gone as high as 99°F and as low as −26°F. A single day has delivered over 5 inches of rain or close to 15 inches of snow. Those are the outer edges worth knowing if you are moving here, planning a trip, or thinking about a house.

Methodology & sources

Temperature & precipitation — the official 1991–2020 climate normals from NOAA's U.S. Climate Normals, measured at Appleton (NOAA GHCN station USC00470265), about 43 km from the city centre.

How we build these numbers →

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