Weather on May 21
Waterbury, CT
55 Years of Data
Avg High
73°F
Avg Low
50°F
Warmest
1996
82°F avg
Coldest
2002
49°F avg
About This Date
May 21st in Waterbury, CT typically brings pleasant spring weather, with average highs around 73°F and lows near 50°F. Over 52 years of records, the warmest May 21st was in 1996 (82°F average), while the coldest was 2002 (49°F) — a 33°F range across recorded history. Rain or other precipitation has occurred on about 37% of May 21st dates historically, with the wettest May 21st recording 2.57" of rain. The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.5°F warmer on this date compared to 20-30 years ago.
Planning for May 21st in Waterbury, CT? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 58° | 50° | 54° | 0.03" | — |
| 2024 | 76° | 57° | 66° | — | — |
| 2023 | 72° | 58° | 65° | — | — |
| 2022 | 79° | 61° | 70° | — | — |
| 2021 | 75° | 50° | 63° | — | — |
| 2020 | 66° | 34° | 50° | — | — |
| 2019 | 85° | 54° | 69° | 0.56" | — |
| 2018 | 80° | 51° | 66° | — | — |
| 2017 | 89° | 43° | 66° | — | — |
| 2016 | 74° | 45° | 59° | — | — |
| 2015 | 67° | 43° | 55° | — | — |
| 2014 | 73° | 54° | 63° | — | — |
| 2013 | 80° | 60° | 70° | — | — |
| 2012 | 67° | 58° | 62° | 0.33" | — |
| 2011 | 67° | 54° | 60° | 0.05" | — |
| 2010 | 81° | 53° | 67° | — | — |
| 2009 | 80° | 51° | 66° | — | — |
| 2008 | 65° | 47° | 56° | 0.05" | — |
| 2007 | 69° | 49° | 59° | — | — |
| 2006 | 64° | 47° | 55° | 0.36" | — |
| 2005 | 71° | 42° | 57° | — | — |
| 2004 | 76° | 57° | 66° | 0.1" | — |
| 2003 | 59° | 45° | 52° | 0.36" | — |
| 2002coldest | 59° | 40° | 49° | — | — |
| 2001 | 66° | 49° | 57° | 0.2" | — |
| 2000 | 54° | 50° | 52° | — | — |
| 1996warmest | 95° | 68° | 82° | — | — |
| 1995 | 78° | 45° | 61° | — | — |
| 1994 | 69° | 38° | 53° | — | — |
| 1993 | 67° | 41° | 54° | — | — |
| 1992 | 87° | 41° | 64° | — | — |
| 1991 | 80° | 40° | 60° | — | — |
| 1990 | 58° | 43° | 50° | 2.18" | — |
| 1989 | 80° | 52° | 66° | — | — |
| 1988 | 68° | 54° | 61° | 1.19" | — |
| 1987 | 72° | 52° | 62° | — | — |
| 1986 | 68° | 61° | 64° | 0.61" | — |
| 1985 | 76° | 59° | 67° | 0.05" | — |
| 1984 | 75° | 52° | 63° | 0.71" | — |
| 1983 | 73° | 59° | 66° | — | — |
| 1982 | 78° | 58° | 68° | 0.3" | — |
| 1981 | 73° | 38° | 55° | — | — |
| 1980 | 72° | 50° | 61° | 2.44" | — |
| 1979 | 73° | 61° | 67° | — | — |
| 1978 | 79° | 59° | 69° | — | — |
| 1977 | 76° | 52° | 64° | — | — |
| 1976 | 73° | 41° | 57° | 0.64" | — |
| 1975 | 85° | 58° | 71° | 1.07" | — |
| 1974 | 68° | 37° | 53° | — | — |
| 1973 | 63° | 52° | 57° | 2.57" | — |
| 1972 | 78° | 55° | 67° | — | — |
| 1971 | 65° | 50° | 57° | — | — |
52 years of data from MT CARMEL