Weather on April 21
Allentown, PA
55 Years of Data
Avg High
65°F
Avg Low
42°F
Warmest
1985
71°F avg
Coldest
1981
40°F avg
About This Date
April 21st in Allentown, PA typically brings mild spring weather, with average highs around 65°F and lows near 42°F. Over 55 years of records, the warmest April 21st was in 1985 (71°F average), while the coldest was 1981 (40°F) — a 31°F range across recorded history. Rain or other precipitation has occurred on about 33% of April 21st dates historically, with the wettest April 21st recording 3.73" of rain. 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 April 21st in Allentown, PA? Great weather for outdoor activities. Consider bringing rain gear or an umbrella.
Cooling Trend
0.6°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 63° | 42° | 52° | — | — |
| 2024 | 50° | 31° | 41° | — | — |
| 2023 | 78° | 45° | 61° | — | — |
| 2022 | 62° | 36° | 49° | — | — |
| 2021 | 67° | 34° | 50° | 0.05" | — |
| 2020 | 58° | 35° | 46° | 0.48" | — |
| 2019 | 69° | 53° | 61° | — | — |
| 2018 | 61° | 28° | 45° | — | — |
| 2017 | 58° | 51° | 54° | 0.69" | — |
| 2016 | 75° | 36° | 55° | — | — |
| 2015 | 63° | 44° | 53° | 0.71" | — |
| 2014 | 70° | 31° | 51° | — | — |
| 2013 | 55° | 31° | 43° | — | — |
| 2012 | 78° | 51° | 65° | 1.22" | — |
| 2011 | 59° | 38° | 48° | — | — |
| 2010 | 67° | 39° | 53° | 0.08" | — |
| 2009 | 67° | 46° | 56° | 0.84" | — |
| 2008 | 70° | 48° | 59° | — | — |
| 2007 | 76° | 37° | 56° | — | — |
| 2006 | 65° | 46° | 55° | 0.15" | — |
| 2005 | 68° | 43° | 55° | — | — |
| 2004 | 67° | 49° | 58° | 0.1" | — |
| 2003 | 63° | 39° | 51° | 0.03" | — |
| 2002 | 54° | 44° | 49° | 0.08" | — |
| 2001 | 70° | 49° | 59° | 0.05" | — |
| 2000 | 53° | 45° | 49° | 3.51" | — |
| 1999 | 57° | 31° | 44° | — | — |
| 1998 | 69° | 38° | 53° | — | — |
| 1997 | 58° | 29° | 43° | — | — |
| 1996 | 74° | 50° | 62° | — | — |
| 1995 | 60° | 51° | 56° | 0.08" | — |
| 1994 | 63° | 43° | 53° | — | — |
| 1993 | 64° | 48° | 56° | 1.83" | — |
| 1992 | 76° | 54° | 65° | — | — |
| 1991 | 48° | 39° | 44° | 3.73" | — |
| 1990 | 65° | 50° | 57° | 0.84" | — |
| 1989 | 63° | 39° | 51° | — | — |
| 1988 | 55° | 38° | 46° | — | — |
| 1987 | 79° | 55° | 67° | — | — |
| 1986 | 62° | 46° | 54° | 0.46" | — |
| 1985warmest | 89° | 53° | 71° | — | — |
| 1984 | 62° | 40° | 51° | — | — |
| 1983 | 59° | 36° | 47° | — | — |
| 1982 | 59° | 39° | 49° | — | — |
| 1981coldest | 49° | 31° | 40° | — | — |
| 1980 | 71° | 49° | 60° | — | — |
| 1979 | 71° | 37° | 54° | — | — |
| 1978 | 52° | 43° | 47° | — | — |
| 1977 | 79° | 48° | 63° | — | — |
| 1976 | 82° | 54° | 68° | — | — |
| 1975 | 55° | 35° | 45° | — | — |
| 1974 | 73° | 36° | 54° | — | — |
| 1973 | 69° | 42° | 56° | — | — |
| 1972 | 62° | 34° | 48° | — | — |
| 1971 | 75° | 42° | 59° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP