Weather on December 21
Philadelphia, PA
55 Years of Data
Avg High
44°F
Avg Low
31°F
Warmest
1990
52°F avg
Coldest
1989
20°F avg
About This Date
December 21st in Philadelphia, PA typically brings chilly winter weather, with average highs around 44°F and lows near 31°F. Over 55 years of records, the warmest December 21st was in 1990 (52°F average), while the coldest was 1989 (20°F) — a 32°F range across recorded history. Precipitation has occurred on 20% of recorded December 21st dates, with snow falling 2% of the time. 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 Philadelphia, PA? Bring layers as temperatures can vary throughout the day.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 39° | 27° | 33° | — | — |
| 2024 | 38° | 30° | 34° | — | — |
| 2023 | 46° | 33° | 40° | — | — |
| 2022 | 42° | 27° | 34° | — | — |
| 2021 | 40° | 26° | 33° | 0.51" | — |
| 2020 | 43° | 32° | 37° | — | — |
| 2019 | 36° | 25° | 30° | — | — |
| 2018 | 65° | 37° | 51° | 4.06" | — |
| 2017 | 51° | 35° | 43° | — | — |
| 2016 | 36° | 21° | 28° | — | — |
| 2015 | 44° | 32° | 38° | — | — |
| 2014 | 35° | 31° | 33° | — | — |
| 2013 | 54° | 44° | 49° | — | — |
| 2012 | 58° | 38° | 48° | 4.67" | — |
| 2011 | 62° | 43° | 52° | 0.2" | — |
| 2010 | 36° | 29° | 32° | — | — |
| 2009 | 34° | 26° | 30° | — | — |
| 2008 | 37° | 15° | 26° | — | — |
| 2007 | 45° | 35° | 40° | — | — |
| 2006 | 50° | 36° | 43° | — | — |
| 2005 | 38° | 24° | 31° | — | — |
| 2004 | 38° | 16° | 27° | — | — |
| 2003 | 41° | 29° | 35° | — | — |
| 2002 | 49° | 41° | 45° | — | — |
| 2001 | 47° | 36° | 41° | — | — |
| 2000 | 34° | 23° | 28° | 0.13" | 0.4" |
| 1999 | 48° | 36° | 42° | 0.05" | — |
| 1998 | 58° | 46° | 52° | 0.18" | — |
| 1997 | 42° | 30° | 36° | — | — |
| 1996 | 30° | 17° | 24° | — | — |
| 1995 | 30° | 20° | 25° | — | — |
| 1994 | 47° | 33° | 40° | — | — |
| 1993 | 50° | 35° | 43° | 2.79" | — |
| 1992 | 39° | 31° | 35° | — | — |
| 1991 | 47° | 34° | 40° | — | — |
| 1990warmest | 59° | 44° | 52° | — | — |
| 1989coldest | 28° | 12° | 20° | — | — |
| 1988 | 52° | 41° | 46° | — | — |
| 1987 | 53° | 39° | 46° | — | — |
| 1986 | 44° | 35° | 40° | — | — |
| 1985 | 34° | 23° | 28° | — | — |
| 1984 | 54° | 36° | 45° | — | — |
| 1983 | 35° | 16° | 25° | — | — |
| 1982 | 46° | 35° | 41° | — | — |
| 1981 | 33° | 21° | 27° | — | — |
| 1980 | 28° | 21° | 25° | — | — |
| 1979 | 39° | 26° | 33° | — | — |
| 1978 | 49° | 37° | 43° | — | — |
| 1977 | 54° | 36° | 45° | 2.64" | — |
| 1976 | 39° | 21° | 30° | — | — |
| 1975 | 40° | 27° | 33° | — | — |
| 1974 | 45° | 36° | 40° | — | — |
| 1973 | 57° | 26° | 42° | 3.25" | — |
| 1972 | 41° | 38° | 39° | 0.91" | — |
| 1971 | 53° | 43° | 48° | — | — |
55 years of data from PHILADELPHIA CITY