Weather on December 18
Boston, MA
55 Years of Data
Avg High
40°F
Avg Low
27°F
Warmest
2023
54°F avg
Coldest
1979
17°F avg
About This Date
December 18th in Boston, MA typically brings chilly winter weather, with average highs around 40°F and lows near 27°F. Over 55 years of records, the warmest December 18th was in 2023 (54°F average), while the coldest was 1979 (17°F) — a 37°F range across recorded history. Precipitation has occurred on 35% of recorded December 18th dates, with snow falling 16% of the time (heaviest snowfall: 1.6"). The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 1.9°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Boston, MA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
Warming Trend
1.9°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 48° | 29° | 38° | — | — |
| 2024 | 50° | 38° | 44° | 1.47" | — |
| 2023warmest | 63° | 45° | 54° | 4.27" | — |
| 2022 | 41° | 33° | 37° | — | — |
| 2021 | 43° | 33° | 38° | 1.42" | 0.1" |
| 2020 | 30° | 21° | 26° | — | — |
| 2019 | 38° | 24° | 31° | — | 0.1" |
| 2018 | 39° | 25° | 32° | 0.05" | 0.1" |
| 2017 | 38° | 22° | 30° | — | — |
| 2016 | 57° | 33° | 45° | 0.28" | — |
| 2015 | 52° | 39° | 45° | 0.1" | — |
| 2014 | 44° | 36° | 40° | 0.03" | — |
| 2013 | 36° | 19° | 28° | — | — |
| 2012 | 50° | 41° | 46° | 2.18" | — |
| 2011 | 28° | 20° | 24° | — | — |
| 2010 | 38° | 24° | 31° | — | — |
| 2009 | 28° | 10° | 19° | — | — |
| 2008 | 40° | 32° | 36° | — | — |
| 2007 | 32° | 18° | 25° | — | — |
| 2006 | 55° | 42° | 49° | 0.05" | — |
| 2005 | 36° | 29° | 32° | — | — |
| 2004 | 37° | 21° | 29° | — | — |
| 2003 | 43° | 32° | 37° | — | — |
| 2002 | 41° | 22° | 31° | — | — |
| 2001 | 41° | 35° | 38° | 1.19" | — |
| 2000 | 40° | 30° | 35° | 0.03" | — |
| 1999 | 38° | 29° | 33° | — | — |
| 1998 | 35° | 27° | 31° | — | — |
| 1997 | 44° | 33° | 39° | — | — |
| 1996 | 58° | 45° | 51° | — | — |
| 1995 | 35° | 26° | 31° | — | — |
| 1994 | 41° | 37° | 39° | 0.86" | — |
| 1993 | 41° | 29° | 35° | — | — |
| 1992 | 46° | 31° | 38° | — | — |
| 1991 | 34° | 15° | 24° | — | — |
| 1990 | 61° | 36° | 48° | 0.53" | — |
| 1989 | 30° | 19° | 25° | — | — |
| 1988 | 27° | 15° | 21° | — | — |
| 1987 | 34° | 23° | 28° | — | — |
| 1986 | 45° | 31° | 38° | 2.24" | — |
| 1985 | 30° | 14° | 22° | 0.1" | 0.4" |
| 1984 | 58° | 37° | 47° | — | — |
| 1983 | 35° | 25° | 30° | — | — |
| 1982 | 26° | 17° | 22° | — | 0.2" |
| 1981 | 35° | 25° | 30° | 0.41" | 1.1" |
| 1980 | 35° | 11° | 23° | — | — |
| 1979coldest | 25° | 9° | 17° | — | — |
| 1978 | 33° | 19° | 26° | — | — |
| 1977 | 43° | 28° | 35° | 0.28" | 0.1" |
| 1976 | 38° | 25° | 31° | — | — |
| 1975 | 42° | 18° | 30° | 0.66" | 0.2" |
| 1974 | 42° | 35° | 39° | — | — |
| 1973 | 38° | 18° | 28° | — | — |
| 1972 | 31° | 15° | 23° | — | — |
| 1971 | 40° | 16° | 28° | 0.15" | 1.6" |
55 years of data from BOSTON