Weather on March 21
Boston, MA
55 Years of Data
Avg High
47°F
Avg Low
33°F
Warmest
2012
67°F avg
Coldest
1988
18°F avg
About This Date
March 21st in Boston, MA typically brings chilly spring weather, with average highs around 47°F and lows near 33°F. Over 56 years of records, the warmest March 21st was in 2012 (67°F average), while the coldest was 1988 (18°F) — a 49°F range across recorded history. Precipitation has occurred on 48% of recorded March 21st dates, with snow falling 14% of the time (heaviest snowfall: 3.6"). The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.9°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Boston, MA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 53° | 38° | 45° | — | — |
| 2025 | 47° | 40° | 43° | 1.02" | — |
| 2024 | 40° | 28° | 34° | — | — |
| 2023 | 58° | 34° | 46° | — | — |
| 2022 | 59° | 43° | 51° | — | — |
| 2021 | 58° | 36° | 47° | — | — |
| 2020 | 57° | 31° | 44° | — | — |
| 2019 | 52° | 33° | 42° | — | — |
| 2018 | 39° | 32° | 36° | — | — |
| 2017 | 53° | 40° | 46° | — | — |
| 2016 | 44° | 28° | 36° | 0.56" | 3.6" |
| 2015 | 41° | 28° | 35° | 0.23" | 1.2" |
| 2014 | 45° | 34° | 39° | — | — |
| 2013 | 35° | 30° | 33° | 0.05" | 0.3" |
| 2012warmest | 78° | 56° | 67° | — | — |
| 2011 | 41° | 34° | 37° | 0.41" | 0.3" |
| 2010 | 54° | 41° | 47° | — | — |
| 2009 | 39° | 27° | 33° | — | — |
| 2008 | 40° | 30° | 35° | — | — |
| 2007 | 35° | 20° | 27° | — | — |
| 2006 | 47° | 23° | 35° | — | — |
| 2005 | 42° | 34° | 38° | — | — |
| 2004 | 50° | 31° | 40° | 0.76" | — |
| 2003 | 63° | 39° | 51° | 0.86" | — |
| 2002 | 48° | 34° | 41° | — | — |
| 2001 | 44° | 34° | 39° | 1.04" | — |
| 2000 | 40° | 35° | 37° | — | — |
| 1999 | 48° | 30° | 39° | — | — |
| 1998 | 34° | 31° | 32° | 0.33" | — |
| 1997 | 46° | 31° | 38° | 0.03" | — |
| 1996 | 48° | 38° | 43° | 0.2" | — |
| 1995 | 63° | 40° | 51° | 0.58" | — |
| 1994 | 42° | 32° | 37° | 0.18" | — |
| 1993 | 42° | 32° | 37° | 0.18" | 0.3" |
| 1992 | 35° | 27° | 31° | 0.03" | 0.3" |
| 1991 | 50° | 33° | 42° | — | — |
| 1990 | 48° | 38° | 43° | 0.2" | — |
| 1989 | 47° | 33° | 40° | 0.79" | — |
| 1988coldest | 25° | 12° | 18° | — | — |
| 1987 | 39° | 33° | 36° | 0.43" | 0.8" |
| 1986 | 28° | 11° | 19° | — | — |
| 1985 | 42° | 26° | 34° | — | — |
| 1984 | 41° | 38° | 39° | 0.61" | — |
| 1983 | 57° | 37° | 47° | 1.96" | — |
| 1982 | 46° | 36° | 41° | 0.25" | — |
| 1981 | 41° | 30° | 36° | 0.1" | 0.4" |
| 1980 | 42° | 38° | 40° | 2.08" | — |
| 1979 | 53° | 42° | 48° | 0.05" | — |
| 1978 | 60° | 35° | 48° | — | — |
| 1977 | 51° | 34° | 42° | — | — |
| 1976 | 62° | 47° | 54° | 0.15" | — |
| 1975 | 50° | 34° | 42° | — | — |
| 1974 | 46° | 34° | 40° | 5.26" | — |
| 1973 | 39° | 28° | 34° | — | — |
| 1972 | 42° | 33° | 38° | 0.05" | — |
| 1971 | 42° | 33° | 38° | — | — |
56 years of data from BOSTON