Weather on October 21
New Haven, CT
55 Years of Data
Avg High
65°F
Avg Low
45°F
Warmest
2016
69°F avg
Coldest
1974
37°F avg
About This Date
October 21st in New Haven, CT typically brings mild fall weather, with average highs around 65°F and lows near 45°F. Over 54 years of records, the warmest October 21st was in 2016 (69°F average), while the coldest was 1974 (37°F) — a 32°F range across recorded history. Rain or other precipitation has occurred on about 22% of October 21st dates historically, with the wettest October 21st recording 5.28" of rain. The last decade has been 7.3°F warmer on this date compared to 20-30 years ago.
The last decade has been 7.3°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in New Haven, CT? Great weather for outdoor activities.
Warming Trend
1.1°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 67° | 53° | 60° | — | — |
| 2024 | 76° | 40° | 58° | — | — |
| 2023 | 64° | 59° | 62° | 1.3" | — |
| 2022 | 64° | 38° | 51° | — | — |
| 2021 | 74° | 50° | 62° | — | — |
| 2020 | 71° | 62° | 67° | — | — |
| 2019 | 70° | 47° | 58° | 0.05" | — |
| 2018 | 52° | 40° | 46° | — | — |
| 2017 | 72° | 41° | 56° | — | — |
| 2016warmest | 75° | 63° | 69° | — | — |
| 2015 | 72° | 47° | 59° | — | — |
| 2014 | 70° | 50° | 60° | 0.46" | — |
| 2013 | 66° | 37° | 52° | — | — |
| 2012 | 66° | 51° | 59° | — | — |
| 2011 | 62° | 51° | 57° | — | — |
| 2010 | 60° | 43° | 51° | 0.15" | — |
| 2009 | 65° | 43° | 54° | — | — |
| 2008 | 62° | 33° | 48° | 0.08" | — |
| 2007 | 70° | 53° | 61° | — | — |
| 2006 | 58° | 36° | 47° | — | — |
| 2005 | 57° | 40° | 48° | — | — |
| 2004 | 57° | 41° | 49° | — | — |
| 2003 | 67° | 54° | 60° | 0.25" | — |
| 2002 | 56° | 36° | 46° | — | — |
| 2001 | 74° | 37° | 55° | — | — |
| 2000 | 72° | 39° | 55° | — | — |
| 1999 | 65° | 35° | 50° | — | — |
| 1997 | 66° | 41° | 54° | — | — |
| 1996 | 54° | 40° | 47° | — | — |
| 1995 | 69° | 60° | 65° | 5.28" | — |
| 1994 | 70° | 53° | 61° | 0.2" | — |
| 1993 | 64° | 49° | 56° | 2.92" | — |
| 1992 | 57° | 42° | 50° | 0.2" | — |
| 1991 | 74° | 34° | 54° | — | — |
| 1990 | 73° | 50° | 62° | — | — |
| 1989 | 72° | 51° | 61° | — | — |
| 1988 | 54° | 33° | 43° | — | — |
| 1987 | 62° | 50° | 56° | 0.36" | — |
| 1986 | 67° | 41° | 54° | — | — |
| 1985 | 59° | 38° | 48° | — | — |
| 1984 | 73° | 55° | 64° | — | — |
| 1983 | 51° | 33° | 42° | — | — |
| 1982 | 63° | 57° | 60° | — | — |
| 1981 | 63° | 42° | 52° | — | — |
| 1980 | 60° | 45° | 52° | — | — |
| 1979 | 75° | 59° | 67° | — | — |
| 1978 | 68° | 42° | 55° | — | — |
| 1977 | 69° | 46° | 58° | — | — |
| 1976 | 62° | 51° | 57° | 4.19" | — |
| 1975 | 64° | 47° | 55° | — | — |
| 1974coldest | 44° | 31° | 37° | — | — |
| 1973 | 61° | 41° | 51° | — | — |
| 1972 | 50° | 29° | 39° | — | — |
| 1971 | 70° | 46° | 58° | — | — |
54 years of data from NEW HAVEN