Weather on December 21
Pittsburgh, PA
55 Years of Data
Avg High
40°F
Avg Low
27°F
Warmest
2013
58°F avg
Coldest
1976
17°F avg
About This Date
December 21st in Pittsburgh, PA typically brings chilly winter weather, with average highs around 40°F and lows near 27°F. Over 43 years of records, the warmest December 21st was in 2013 (58°F average), while the coldest was 1976 (17°F) — a 41°F range across recorded history. Precipitation has occurred on 53% of recorded December 21st dates, with snow falling 9% of the time. The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.2°F warmer on this date compared to 20-30 years ago.
Planning for December 21st in Pittsburgh, PA? 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 |
|---|---|---|---|---|---|
| 2025 | 44° | 24° | 34° | — | — |
| 2024 | 31° | 20° | 26° | 0.13" | — |
| 2023 | 41° | 30° | 36° | — | — |
| 2022 | 42° | 22° | 32° | — | — |
| 2021 | 44° | 26° | 35° | — | — |
| 2020 | 38° | 32° | 35° | 0.15" | — |
| 2019 | 45° | 24° | 35° | — | — |
| 2018 | 49° | 32° | 40° | 1.8" | — |
| 2017 | 41° | 25° | 33° | — | — |
| 2016 | 37° | 26° | 32° | — | — |
| 2015 | 55° | 40° | 47° | 0.08" | — |
| 2014 | 34° | 25° | 30° | — | — |
| 2013warmest | 62° | 54° | 58° | 2.06" | — |
| 2012 | 42° | 29° | 36° | 0.05" | — |
| 2011 | 59° | 43° | 51° | 1.65" | — |
| 2010 | 29° | 21° | 25° | 0.03" | — |
| 2009 | 32° | 25° | 29° | 0.05" | — |
| 2008 | 33° | 4° | 19° | 0.1" | — |
| 2007 | 42° | 31° | 37° | — | — |
| 2006 | 45° | 36° | 40° | 0.1" | — |
| 2005 | 29° | 20° | 24° | — | — |
| 2004 | 44° | 12° | 28° | 0.03" | — |
| 2003 | 38° | 16° | 27° | 0.25" | — |
| 2002 | 43° | 32° | 37° | 0.03" | — |
| 2001 | 35° | 26° | 31° | — | — |
| 2000 | 30° | 14° | 22° | — | — |
| 1999 | 31° | 22° | 26° | — | — |
| 1998 | 51° | 49° | 50° | 0.05" | — |
| 1997 | 37° | 34° | 35° | — | — |
| 1996 | 36° | 16° | 26° | — | — |
| 1995 | 27° | 18° | 22° | 0.08" | — |
| 1994 | 53° | 31° | 42° | — | — |
| 1993 | 35° | 26° | 31° | 0.89" | — |
| 1992 | 43° | 24° | 33° | — | — |
| 1991 | 42° | 31° | 36° | — | — |
| 1978 | 57° | 29° | 43° | — | — |
| 1977 | 37° | 29° | 33° | 0.05" | 0.2" |
| 1976coldest | 21° | 13° | 17° | 0.03" | 0.1" |
| 1975 | 33° | 16° | 24° | 0.08" | 0.4" |
| 1974 | 38° | 24° | 31° | 0.03" | — |
| 1973 | 32° | 21° | 27° | 0.03" | 0.1" |
| 1972 | 53° | 42° | 48° | 0.61" | — |
| 1971 | 43° | 33° | 38° | — | — |
43 years of data from PITTSBURGH WSO CITY