Weather on December 31
Philadelphia, PA
55 Years of Data
Avg High
44°F
Avg Low
32°F
Warmest
1992
55°F avg
Coldest
2017
21°F avg
About This Date
December 31st in Philadelphia, PA typically brings chilly winter weather, with average highs around 44°F and lows near 32°F. Over 55 years of records, the warmest December 31st was in 1992 (55°F average), while the coldest was 2017 (21°F) — a 34°F range across recorded history. Precipitation has occurred on 22% of recorded December 31st dates, with snow falling 4% of the time. The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.0°F warmer on this date compared to 20-30 years ago.
Planning for December 31st in Philadelphia, PA? Bring layers as temperatures can vary throughout the day.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 34° | 26° | 30° | — | — |
| 2024 | 59° | 40° | 49° | — | — |
| 2023 | 46° | 40° | 43° | — | — |
| 2022 | 60° | 42° | 51° | — | — |
| 2021 | 55° | 47° | 51° | 0.03" | — |
| 2020 | 49° | 34° | 41° | 0.18" | — |
| 2019 | 45° | 38° | 41° | 0.71" | — |
| 2018 | 45° | 36° | 40° | — | — |
| 2017coldest | 28° | 14° | 21° | — | — |
| 2016 | 42° | 34° | 38° | — | — |
| 2015 | 51° | 44° | 48° | 0.74" | — |
| 2014 | 37° | 26° | 32° | — | — |
| 2013 | 45° | 25° | 35° | — | — |
| 2012 | 38° | 30° | 34° | — | — |
| 2011 | 59° | 44° | 52° | — | — |
| 2010 | 43° | 32° | 37° | — | — |
| 2009 | 32° | 24° | 28° | 0.18" | 0.9" |
| 2008 | 30° | 18° | 24° | — | — |
| 2007 | 47° | 35° | 41° | — | — |
| 2006 | 45° | 34° | 39° | — | — |
| 2005 | 41° | 36° | 38° | 0.28" | — |
| 2004 | 56° | 43° | 49° | — | — |
| 2003 | 48° | 36° | 42° | — | — |
| 2002 | 50° | 44° | 47° | — | — |
| 2001 | 32° | 22° | 27° | — | — |
| 2000 | 35° | 24° | 30° | — | — |
| 1999 | 47° | 39° | 43° | — | — |
| 1998 | 25° | 20° | 22° | 0.05" | 0.2" |
| 1997 | 33° | 19° | 26° | — | — |
| 1996 | 38° | 25° | 31° | — | — |
| 1995 | 49° | 33° | 41° | — | — |
| 1994 | 39° | 21° | 30° | — | — |
| 1993 | 33° | 20° | 26° | — | — |
| 1992warmest | 64° | 47° | 55° | — | — |
| 1991 | 39° | 26° | 33° | — | — |
| 1990 | 59° | 30° | 45° | — | — |
| 1989 | 51° | 30° | 41° | — | — |
| 1988 | 48° | 33° | 41° | — | — |
| 1987 | 42° | 19° | 31° | — | — |
| 1986 | 48° | 36° | 42° | — | — |
| 1985 | 48° | 31° | 39° | — | — |
| 1984 | 47° | 40° | 43° | — | — |
| 1983 | 36° | 18° | 27° | — | — |
| 1982 | 42° | 33° | 38° | — | — |
| 1981 | 42° | 27° | 34° | — | — |
| 1980 | 32° | 19° | 26° | — | — |
| 1979 | 51° | 37° | 44° | — | — |
| 1978 | 49° | 35° | 42° | — | — |
| 1977 | 45° | 35° | 40° | 0.1" | — |
| 1976 | 31° | 17° | 24° | — | — |
| 1975 | 48° | 38° | 43° | 1.7" | — |
| 1974 | 42° | 32° | 37° | 0.86" | — |
| 1973 | 38° | 33° | 35° | 0.89" | — |
| 1972 | 62° | 47° | 54° | 0.41" | — |
| 1971 | 56° | 29° | 42° | — | — |
55 years of data from PHILADELPHIA WSFO