Weather on October 21
Allentown, PA
55 Years of Data
Avg High
64°F
Avg Low
40°F
Warmest
1979
67°F avg
Coldest
1972
37°F avg
About This Date
October 21st in Allentown, PA typically brings mild fall weather, with average highs around 64°F and lows near 40°F. Over 55 years of records, the warmest October 21st was in 1979 (67°F average), while the coldest was 1972 (37°F) — a 30°F range across recorded history. Rain or other precipitation has occurred on about 25% of October 21st dates historically, with the wettest October 21st recording 5.18" of rain. The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
The last decade has been 5.9°F warmer on this date compared to 20-30 years ago.
Planning for October 21st in Allentown, PA? Great weather for outdoor activities.
Warming Trend
1.0°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 69° | 36° | 52° | 0.25" | — |
| 2024 | 81° | 39° | 60° | — | — |
| 2023 | 61° | 51° | 56° | 0.03" | — |
| 2022 | 63° | 28° | 46° | — | — |
| 2021 | 75° | 46° | 61° | — | — |
| 2020 | 69° | 54° | 61° | — | — |
| 2019 | 69° | 47° | 58° | — | — |
| 2018 | 49° | 37° | 43° | — | — |
| 2017 | 77° | 40° | 58° | — | — |
| 2016 | 81° | 54° | 67° | 0.15" | — |
| 2015 | 77° | 42° | 60° | — | — |
| 2014 | 67° | 48° | 57° | 0.05" | — |
| 2013 | 66° | 34° | 50° | — | — |
| 2012 | 64° | 39° | 52° | — | — |
| 2011 | 55° | 45° | 50° | — | — |
| 2010 | 61° | 40° | 50° | — | — |
| 2009 | 71° | 38° | 54° | — | — |
| 2008 | 61° | 31° | 46° | 0.05" | — |
| 2007 | 75° | 43° | 59° | — | — |
| 2006 | 57° | 36° | 46° | — | — |
| 2005 | 52° | 48° | 50° | 0.1" | — |
| 2004 | 51° | 46° | 49° | 0.66" | — |
| 2003 | 73° | 42° | 58° | — | — |
| 2002 | 55° | 36° | 45° | — | — |
| 2001 | 76° | 37° | 56° | — | — |
| 2000 | 73° | 38° | 55° | — | — |
| 1999 | 58° | 35° | 46° | — | — |
| 1998 | 56° | 38° | 47° | — | — |
| 1997 | 55° | 36° | 45° | — | — |
| 1996 | 57° | 47° | 52° | 0.03" | — |
| 1995 | 70° | 41° | 55° | 5.18" | — |
| 1994 | 69° | 47° | 58° | — | — |
| 1993 | 69° | 51° | 60° | 0.33" | — |
| 1992 | 54° | 37° | 45° | 0.03" | — |
| 1991 | 58° | 29° | 43° | — | — |
| 1990 | 64° | 35° | 50° | — | — |
| 1989 | 50° | 34° | 42° | 0.08" | — |
| 1988 | 51° | 36° | 43° | 3.18" | — |
| 1987 | 58° | 39° | 48° | 0.08" | — |
| 1986 | 67° | 36° | 51° | — | — |
| 1985 | 61° | 44° | 52° | — | — |
| 1984 | 77° | 56° | 66° | — | — |
| 1983 | 56° | 34° | 45° | — | — |
| 1982 | 61° | 42° | 51° | — | — |
| 1981 | 71° | 33° | 52° | — | — |
| 1980 | 64° | 47° | 55° | — | — |
| 1979warmest | 79° | 55° | 67° | — | — |
| 1978 | 68° | 36° | 52° | — | — |
| 1977 | 70° | 43° | 56° | — | — |
| 1976 | 60° | 37° | 49° | — | — |
| 1975 | 69° | 42° | 56° | — | — |
| 1974 | 46° | 29° | 37° | — | — |
| 1973 | 61° | 40° | 50° | — | — |
| 1972coldest | 50° | 23° | 37° | — | — |
| 1971 | 70° | 47° | 58° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP