Weather on May 21
Green Bay, WI
55 Years of Data
Avg High
71°F
Avg Low
47°F
Warmest
2021
74°F avg
Coldest
2002
46°F avg
About This Date
May 21st in Green Bay, WI typically brings pleasant spring weather, with average highs around 71°F and lows near 47°F. Over 55 years of records, the warmest May 21st was in 2021 (74°F average), while the coldest was 2002 (46°F) — a 28°F range across recorded history. Rain or other precipitation has occurred on about 33% of May 21st dates historically, with the wettest May 21st recording 1.5" of rain. The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.7°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Green Bay, WI? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.5°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 54° | 45° | 49° | 0.94" | — |
| 2024 | 73° | 51° | 62° | 1.04" | — |
| 2023 | 79° | 49° | 64° | — | — |
| 2022 | 65° | 49° | 57° | — | — |
| 2021warmest | 80° | 68° | 74° | 0.41" | — |
| 2020 | 73° | 49° | 61° | — | — |
| 2019 | 61° | 40° | 50° | 0.03" | — |
| 2018 | 62° | 38° | 50° | 0.25" | — |
| 2017 | 63° | 48° | 55° | 0.64" | — |
| 2016 | 80° | 48° | 64° | — | — |
| 2015 | 76° | 41° | 58° | 0.05" | — |
| 2014 | 79° | 50° | 64° | — | — |
| 2013 | 79° | 61° | 70° | 0.33" | — |
| 2012 | 72° | 45° | 58° | — | — |
| 2011 | 69° | 52° | 60° | 1.5" | — |
| 2010 | 62° | 55° | 59° | 0.05" | — |
| 2009 | 80° | 57° | 69° | 0.2" | — |
| 2008 | 70° | 40° | 55° | — | — |
| 2007 | 65° | 46° | 55° | 0.23" | — |
| 2006 | 60° | 38° | 49° | — | — |
| 2005 | 74° | 43° | 58° | — | — |
| 2004 | 56° | 47° | 51° | 1.3" | — |
| 2003 | 58° | 34° | 46° | — | — |
| 2002coldest | 63° | 30° | 46° | — | — |
| 2001 | 66° | 50° | 58° | 1.35" | — |
| 2000 | 68° | 38° | 53° | 0.05" | — |
| 1999 | 69° | 56° | 62° | 0.28" | — |
| 1998 | 65° | 46° | 55° | — | — |
| 1997 | 62° | 34° | 48° | — | — |
| 1996 | 77° | 47° | 62° | — | — |
| 1995 | 68° | 44° | 56° | — | — |
| 1994 | 86° | 56° | 71° | — | — |
| 1993 | 67° | 40° | 53° | — | — |
| 1992 | 86° | 52° | 69° | — | — |
| 1991 | 79° | 53° | 66° | — | — |
| 1990 | 60° | 45° | 52° | — | — |
| 1989 | 79° | 52° | 65° | — | — |
| 1988 | 82° | 53° | 68° | — | — |
| 1987 | 86° | 55° | 71° | 0.43" | — |
| 1986 | 65° | 42° | 53° | — | — |
| 1985 | 63° | 38° | 50° | — | — |
| 1984 | 74° | 45° | 59° | — | — |
| 1983 | 72° | 48° | 60° | — | — |
| 1982 | 61° | 45° | 53° | — | — |
| 1981 | 80° | 44° | 62° | — | — |
| 1980 | 84° | 50° | 67° | — | — |
| 1979 | 61° | 38° | 49° | — | — |
| 1978 | 61° | 38° | 49° | — | — |
| 1977 | 82° | 61° | 71° | — | — |
| 1976 | 68° | 42° | 55° | — | — |
| 1975 | 84° | 59° | 72° | — | — |
| 1974 | 81° | 56° | 68° | 0.86" | — |
| 1973 | 69° | 50° | 60° | — | — |
| 1972 | 83° | 56° | 69° | — | — |
| 1971 | 60° | 37° | 49° | — | — |
55 years of data from GREEN BAY