Weather on December 21
New Haven, CT
55 Years of Data
Avg High
42°F
Avg Low
26°F
Warmest
2018
55°F avg
Coldest
1983
15°F avg
About This Date
December 21st in New Haven, CT typically brings chilly winter weather, with average highs around 42°F and lows near 26°F. Over 54 years of records, the warmest December 21st was in 2018 (55°F average), while the coldest was 1983 (15°F) — a 40°F range across recorded history. Precipitation has occurred on 22% of recorded December 21st dates, with snow falling 4% of the time. The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.1°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in New Haven, CT? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.8°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 49° | 32° | 40° | — | — |
| 2024 | 32° | 21° | 27° | — | — |
| 2023 | 43° | 28° | 36° | — | — |
| 2022 | 40° | 24° | 32° | — | — |
| 2021 | 43° | 30° | 37° | — | — |
| 2020 | 43° | 25° | 34° | — | — |
| 2019 | 33° | 18° | 26° | — | — |
| 2018warmest | 60° | 50° | 55° | 3.35" | — |
| 2017 | 38° | 24° | 31° | — | — |
| 2016 | 37° | 21° | 29° | — | — |
| 2015 | 52° | 39° | 45° | — | — |
| 2014 | 38° | 34° | 36° | 0.08" | — |
| 2013 | 52° | 33° | 42° | — | — |
| 2012 | 57° | 41° | 49° | 1.78" | — |
| 2011 | 56° | 43° | 49° | 0.36" | — |
| 2010 | 38° | 30° | 34° | — | — |
| 2009 | 36° | 26° | 31° | — | — |
| 2008 | 39° | 23° | 31° | 1.9" | — |
| 2007 | 38° | 33° | 35° | — | — |
| 2006 | 53° | 28° | 41° | — | — |
| 2005 | 31° | 20° | 25° | — | — |
| 2004 | 32° | 7° | 19° | — | — |
| 2003 | 39° | 23° | 31° | — | — |
| 2002 | 44° | 39° | 42° | — | — |
| 2001 | 41° | 31° | 36° | — | — |
| 2000 | 32° | 11° | 21° | — | — |
| 1999 | 57° | 35° | 46° | 0.1" | — |
| 1997 | 43° | 23° | 33° | 0.1" | — |
| 1996 | 32° | 12° | 22° | — | — |
| 1995 | 28° | 9° | 18° | — | — |
| 1994 | 52° | 24° | 38° | — | — |
| 1993 | 54° | 31° | 42° | 2.34" | — |
| 1992 | 43° | 23° | 33° | — | — |
| 1991 | 43° | 28° | 35° | — | — |
| 1990 | 45° | 36° | 40° | 0.03" | — |
| 1989 | 27° | 14° | 20° | — | — |
| 1988 | 48° | 41° | 45° | — | — |
| 1987 | 46° | 26° | 36° | — | — |
| 1986 | 43° | 33° | 38° | — | — |
| 1985 | 29° | 17° | 23° | — | 1" |
| 1984 | 45° | 30° | 37° | — | — |
| 1983coldest | 23° | 7° | 15° | — | — |
| 1982 | 38° | 31° | 34° | — | — |
| 1981 | 32° | 14° | 23° | — | — |
| 1980 | 30° | 13° | 21° | — | — |
| 1979 | 37° | 26° | 32° | — | — |
| 1978 | 43° | 32° | 37° | — | — |
| 1977 | 50° | 35° | 43° | 5.21" | — |
| 1976 | 46° | 15° | 31° | — | — |
| 1975 | 27° | 12° | 19° | 0.08" | 0.4" |
| 1974 | 38° | 34° | 36° | — | — |
| 1973 | 58° | 36° | 47° | 4.85" | — |
| 1972 | 38° | 27° | 32° | — | — |
| 1971 | 50° | 32° | 41° | — | — |
54 years of data from NEW HAVEN