Weather on December 20
Allentown, PA
55 Years of Data
Avg High
38°F
Avg Low
23°F
Warmest
2002
46°F avg
Coldest
2004
9°F avg
About This Date
December 20th in Allentown, PA typically brings cold winter weather, with average highs around 38°F and lows near 23°F. Over 55 years of records, the warmest December 20th was in 2002 (46°F average), while the coldest was 2004 (9°F) — a 37°F range across recorded history. Precipitation has occurred on 36% of recorded December 20th dates, with snow falling 13% of the time (heaviest snowfall: 3.7"). 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 20th in Allentown, PA? Bundle up with warm layers and protect extremities from the cold. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 36° | 20° | 28° | — | — |
| 2024 | 33° | 30° | 32° | 0.53" | 3.7" |
| 2023 | 42° | 24° | 33° | — | — |
| 2022 | 38° | 20° | 29° | — | — |
| 2021 | 37° | 17° | 27° | — | — |
| 2020 | 38° | 21° | 30° | — | — |
| 2019 | 36° | 19° | 28° | — | — |
| 2018 | 52° | 23° | 38° | 1.22" | — |
| 2017 | 50° | 30° | 40° | — | — |
| 2016 | 33° | 11° | 22° | — | — |
| 2015 | 41° | 23° | 32° | — | — |
| 2014 | 35° | 30° | 33° | — | — |
| 2013 | 48° | 27° | 38° | — | — |
| 2012 | 44° | 26° | 35° | 0.97" | — |
| 2011 | 48° | 38° | 43° | 0.2" | — |
| 2010 | 35° | 20° | 27° | — | — |
| 2009 | 32° | 22° | 27° | 0.03" | 0.2" |
| 2008 | 29° | 21° | 25° | — | — |
| 2007 | 43° | 27° | 35° | — | — |
| 2006 | 45° | 21° | 33° | — | — |
| 2005 | 32° | 17° | 25° | — | — |
| 2004coldest | 14° | 4° | 9° | — | — |
| 2003 | 36° | 21° | 28° | — | — |
| 2002warmest | 59° | 33° | 46° | 1.96" | — |
| 2001 | 43° | 28° | 35° | — | — |
| 2000 | 30° | 12° | 21° | 0.1" | 0.6" |
| 1999 | 43° | 27° | 35° | 1.42" | — |
| 1998 | 48° | 37° | 43° | — | — |
| 1997 | 47° | 28° | 37° | — | — |
| 1996 | 25° | 16° | 20° | — | — |
| 1995 | 22° | 18° | 20° | 0.53" | 1.8" |
| 1994 | 45° | 26° | 35° | — | — |
| 1993 | 42° | 29° | 35° | 0.1" | — |
| 1992 | 48° | 30° | 39° | 0.41" | — |
| 1991 | 35° | 19° | 27° | — | — |
| 1990 | 41° | 27° | 34° | — | — |
| 1989 | 27° | 13° | 20° | — | — |
| 1988 | 52° | 22° | 37° | — | — |
| 1987 | 42° | 33° | 38° | 0.89" | — |
| 1986 | 39° | 29° | 34° | — | — |
| 1985 | 24° | 7° | 15° | 0.1" | 0.3" |
| 1984 | 50° | 32° | 41° | — | — |
| 1983 | 26° | 11° | 18° | — | — |
| 1982 | 35° | 30° | 33° | 0.13" | 0.4" |
| 1981 | 25° | 10° | 17° | — | — |
| 1980 | 22° | 6° | 14° | — | — |
| 1979 | 28° | 18° | 23° | 0.03" | 0.1" |
| 1978 | 32° | 24° | 28° | 0.36" | — |
| 1977 | 37° | 32° | 35° | 0.28" | — |
| 1976 | 47° | 28° | 37° | 0.51" | — |
| 1975 | 37° | 12° | 25° | — | — |
| 1974 | 39° | 26° | 33° | — | — |
| 1973 | 50° | 22° | 36° | 3.15" | — |
| 1972 | 42° | 36° | 39° | 0.48" | — |
| 1971 | 39° | 31° | 35° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP