Weather on October 21
Green Bay, WI
55 Years of Data
Avg High
56°F
Avg Low
37°F
Warmest
2024
68°F avg
Coldest
1982
32°F avg
About This Date
October 21st in Green Bay, WI typically brings cool fall weather, with average highs around 56°F and lows near 37°F. Over 55 years of records, the warmest October 21st was in 2024 (68°F average), while the coldest was 1982 (32°F) — a 36°F range across recorded history. Precipitation has occurred on 33% of recorded October 21st dates, with snow falling 2% of the time (heaviest snowfall: 1.2"). The last decade has been 6.4°F warmer on this date compared to 20-30 years ago.
The last decade has been 6.4°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Green Bay, WI? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 50° | 41° | 46° | 0.46" | — |
| 2024warmest | 81° | 55° | 68° | — | — |
| 2023 | 46° | 37° | 42° | 0.91" | — |
| 2022 | 76° | 37° | 56° | — | — |
| 2021 | 56° | 35° | 45° | 0.05" | — |
| 2020 | 44° | 39° | 42° | — | — |
| 2019 | 60° | 46° | 53° | 0.66" | — |
| 2018 | 47° | 30° | 39° | — | — |
| 2017 | 76° | 58° | 67° | — | — |
| 2016 | 52° | 35° | 43° | — | — |
| 2015 | 69° | 48° | 59° | 0.23" | — |
| 2014 | 51° | 31° | 41° | — | — |
| 2013 | 47° | 33° | 40° | — | — |
| 2012 | 61° | 34° | 47° | — | — |
| 2011 | 54° | 33° | 43° | — | — |
| 2010 | 50° | 33° | 42° | — | — |
| 2009 | 48° | 43° | 45° | 1.65" | — |
| 2008 | 51° | 29° | 40° | — | — |
| 2007 | 74° | 57° | 65° | — | — |
| 2006 | 46° | 30° | 38° | 0.41" | — |
| 2005 | 55° | 30° | 43° | — | — |
| 2004 | 60° | 31° | 45° | — | — |
| 2003 | 59° | 36° | 47° | — | — |
| 2002 | 43° | 32° | 37° | 2.11" | 1.2" |
| 2001 | 58° | 34° | 46° | — | — |
| 2000 | 57° | 39° | 48° | — | — |
| 1999 | 65° | 34° | 49° | — | — |
| 1998 | 50° | 27° | 38° | — | — |
| 1997 | 42° | 24° | 33° | — | — |
| 1996 | 61° | 41° | 51° | — | — |
| 1995 | 38° | 34° | 36° | 0.3" | — |
| 1994 | 68° | 37° | 53° | — | — |
| 1993 | 45° | 38° | 41° | 0.05" | — |
| 1992 | 52° | 32° | 42° | — | — |
| 1991 | 66° | 42° | 54° | — | — |
| 1990 | 50° | 34° | 42° | 0.76" | — |
| 1989 | 55° | 31° | 43° | 0.03" | — |
| 1988 | 49° | 36° | 42° | 0.41" | — |
| 1987 | 46° | 32° | 39° | 0.13" | — |
| 1986 | 71° | 40° | 55° | — | — |
| 1985 | 59° | 36° | 47° | — | — |
| 1984 | 53° | 39° | 46° | 0.38" | — |
| 1983 | 55° | 37° | 46° | — | — |
| 1982coldest | 38° | 27° | 32° | — | — |
| 1981 | 43° | 34° | 38° | 0.03" | — |
| 1980 | 48° | 33° | 41° | — | — |
| 1979 | 75° | 50° | 63° | 0.1" | — |
| 1978 | 71° | 48° | 60° | — | — |
| 1977 | 65° | 41° | 53° | — | — |
| 1976 | 42° | 28° | 35° | — | — |
| 1975 | 61° | 40° | 50° | — | — |
| 1974 | 52° | 24° | 38° | — | — |
| 1973 | 65° | 36° | 50° | — | — |
| 1972 | 46° | 39° | 43° | 0.69" | — |
| 1971 | 70° | 55° | 62° | — | — |
55 years of data from GREEN BAY