Weather on December 21
Cambridge, MA
55 Years of Data
Avg High
38°F
Avg Low
22°F
Warmest
1988
46°F avg
Coldest
1980
8°F avg
About This Date
December 21st in Cambridge, MA typically brings cold winter weather, with average highs around 38°F and lows near 22°F. Over 55 years of records, the warmest December 21st was in 1988 (46°F average), while the coldest was 1980 (8°F) — a 38°F range across recorded history. Precipitation has occurred on 42% of recorded December 21st dates, with snow falling 16% of the time (heaviest snowfall: 9"). Temperatures on this date have remained relatively stable over the past several decades.
Temperatures on this date have remained relatively stable over the past several decades.
Planning for December 21st in Cambridge, MA? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 42° | 28° | 35° | 1.37" | — |
| 2024 | 33° | 23° | 28° | 1.63" | 5.4" |
| 2023 | 44° | 24° | 34° | — | — |
| 2022 | 41° | 24° | 33° | — | — |
| 2021 | 34° | 20° | 27° | — | — |
| 2020 | 37° | 23° | 30° | 0.08" | — |
| 2019 | 30° | 15° | 23° | — | — |
| 2018 | 56° | 30° | 43° | 0.61" | — |
| 2017 | 50° | 26° | 38° | — | — |
| 2016 | 35° | 16° | 25° | — | — |
| 2015 | 43° | 27° | 35° | — | — |
| 2014 | 35° | 27° | 31° | — | — |
| 2013 | 52° | 34° | 43° | — | — |
| 2012 | 43° | 29° | 36° | 0.08" | — |
| 2011 | 42° | 26° | 34° | — | — |
| 2010 | 33° | 24° | 29° | 0.41" | 1.8" |
| 2009 | 24° | 17° | 21° | 2.54" | — |
| 2008 | 30° | 13° | 21° | 0.15" | 1" |
| 2007 | 29° | 24° | 26° | — | — |
| 2006 | 42° | 23° | 33° | — | — |
| 2005 | 30° | 20° | 25° | — | — |
| 2004 | 33° | 6° | 20° | — | — |
| 2003 | 37° | 19° | 28° | — | — |
| 2002 | 61° | 29° | 45° | 3.66" | — |
| 2001 | 45° | 29° | 37° | — | — |
| 2000 | 33° | 15° | 24° | 0.05" | 1" |
| 1999 | 59° | 22° | 40° | 0.81" | — |
| 1998 | 50° | 38° | 44° | — | — |
| 1997 | 40° | 19° | 29° | — | — |
| 1996 | 30° | 17° | 24° | — | — |
| 1995 | 27° | 15° | 21° | — | 4" |
| 1994 | 37° | 22° | 29° | — | — |
| 1993 | 43° | 31° | 37° | 0.91" | — |
| 1992 | 46° | 20° | 33° | 0.05" | — |
| 1991 | 33° | 20° | 26° | 0.18" | — |
| 1990 | 49° | 27° | 38° | — | — |
| 1989 | 30° | 10° | 20° | — | — |
| 1988warmest | 55° | 38° | 46° | — | — |
| 1987 | 34° | 30° | 32° | 0.46" | — |
| 1986 | 39° | 25° | 32° | — | — |
| 1985 | 37° | 23° | 30° | — | — |
| 1984 | 39° | 24° | 32° | — | — |
| 1983 | 46° | 4° | 25° | — | — |
| 1982 | 32° | 25° | 28° | 0.13" | 0.5" |
| 1981 | 22° | 8° | 15° | — | — |
| 1980coldest | 16° | 0° | 8° | — | — |
| 1979 | 25° | 12° | 18° | — | — |
| 1978 | 30° | 13° | 21° | 1.55" | — |
| 1977 | 38° | 30° | 34° | 0.41" | — |
| 1976 | 45° | 28° | 36° | 0.97" | — |
| 1975 | 33° | 2° | 17° | 3.53" | 9" |
| 1974 | 43° | 26° | 34° | — | — |
| 1973 | 58° | 26° | 42° | 0.2" | — |
| 1972 | 30° | 18° | 24° | 0.33" | 0.5" |
| 1971 | 30° | 24° | 27° | 0.41" | 0.2" |
55 years of data from CHESTNUT HILL