Weather on December 18
Allentown, PA
55 Years of Data
Avg High
39°F
Avg Low
24°F
Warmest
2006
50°F avg
Coldest
1973
17°F avg
About This Date
December 18th in Allentown, PA typically brings cold winter weather, with average highs around 39°F and lows near 24°F. Over 55 years of records, the warmest December 18th was in 2006 (50°F average), while the coldest was 1973 (17°F) — a 33°F range across recorded history. Precipitation has occurred on 27% of recorded December 18th dates, with snow falling 7% of the time. The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.1°F warmer on this date compared to 20-30 years ago.
Planning for December 18th in Allentown, PA? Bundle up with warm layers and protect extremities from the cold.
Warming Trend
1.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 49° | 18° | 33° | 0.2" | — |
| 2024 | 50° | 25° | 38° | 0.51" | — |
| 2023 | 58° | 35° | 46° | 5.03" | — |
| 2022 | 39° | 26° | 33° | — | — |
| 2021 | 42° | 36° | 39° | 0.33" | — |
| 2020 | 32° | 14° | 23° | — | — |
| 2019 | 36° | 19° | 28° | 0.05" | 0.5" |
| 2018 | 40° | 22° | 31° | — | — |
| 2017 | 47° | 34° | 40° | — | — |
| 2016 | 48° | 30° | 39° | 0.38" | — |
| 2015 | 51° | 36° | 43° | — | — |
| 2014 | 39° | 34° | 36° | — | — |
| 2013 | 34° | 11° | 23° | — | — |
| 2012 | 52° | 40° | 46° | 0.41" | — |
| 2011 | 35° | 19° | 27° | — | — |
| 2010 | 33° | 13° | 23° | — | — |
| 2009 | 31° | 15° | 23° | — | — |
| 2008 | 39° | 28° | 34° | — | — |
| 2007 | 34° | 21° | 27° | — | — |
| 2006warmest | 62° | 37° | 50° | — | — |
| 2005 | 38° | 22° | 30° | — | — |
| 2004 | 44° | 17° | 31° | — | — |
| 2003 | 34° | 29° | 31° | — | — |
| 2002 | 36° | 12° | 24° | — | — |
| 2001 | 51° | 38° | 44° | 0.89" | — |
| 2000 | 30° | 19° | 25° | — | — |
| 1999 | 42° | 28° | 35° | — | — |
| 1998 | 39° | 23° | 31° | — | — |
| 1997 | 44° | 24° | 34° | — | — |
| 1996 | 49° | 39° | 44° | 0.03" | — |
| 1995 | 35° | 21° | 28° | 0.03" | 0.2" |
| 1994 | 50° | 33° | 42° | — | — |
| 1993 | 40° | 22° | 31° | 0.3" | 0.1" |
| 1992 | 44° | 27° | 35° | — | — |
| 1991 | 35° | 17° | 26° | — | — |
| 1990 | 48° | 38° | 43° | 1.42" | — |
| 1989 | 25° | 9° | 17° | — | — |
| 1988 | 31° | 14° | 22° | — | — |
| 1987 | 36° | 24° | 30° | — | — |
| 1986 | 43° | 38° | 40° | 2.51" | — |
| 1985 | 28° | 13° | 20° | — | — |
| 1984 | 59° | 37° | 48° | — | — |
| 1983 | 32° | 18° | 25° | — | — |
| 1982 | 29° | 15° | 22° | — | — |
| 1981 | 32° | 16° | 24° | — | — |
| 1980 | 38° | 8° | 23° | — | — |
| 1979 | 31° | 18° | 24° | — | — |
| 1978 | 40° | 28° | 34° | — | — |
| 1977 | 33° | 30° | 32° | 2.97" | — |
| 1976 | 42° | 28° | 35° | — | — |
| 1975 | 35° | 18° | 26° | — | — |
| 1974 | 36° | 26° | 31° | — | — |
| 1973coldest | 23° | 10° | 17° | — | — |
| 1972 | 36° | 16° | 26° | — | — |
| 1971 | 33° | 19° | 26° | 0.1" | 1" |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP