Weather on June 21
Allentown, PA
55 Years of Data
Avg High
82°F
Avg Low
61°F
Warmest
2024
82°F avg
Coldest
1992
58°F avg
About This Date
June 21st in Allentown, PA typically brings warm summer weather, with average highs around 82°F and lows near 61°F. Over 55 years of records, the warmest June 21st was in 2024 (82°F average), while the coldest was 1992 (58°F) — a 24°F range across recorded history. Rain or other precipitation has occurred on about 35% of June 21st dates historically, with the wettest June 21st recording 4.19" of rain. The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 4.5°F warmer on this date compared to 20-30 years ago.
Planning for June 21st in Allentown, PA? Stay hydrated and seek shade during peak afternoon hours. Consider bringing rain gear or an umbrella.
Warming Trend
0.4°F per decade on this date
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2025 | 89° | 65° | 77° | — | — |
| 2024warmest | 96° | 68° | 82° | — | — |
| 2023 | 74° | 57° | 65° | — | — |
| 2022 | 78° | 52° | 65° | — | — |
| 2021 | 90° | 68° | 79° | 0.18" | — |
| 2020 | 87° | 61° | 74° | — | — |
| 2019 | 79° | 63° | 71° | 0.18" | — |
| 2018 | 87° | 67° | 77° | — | — |
| 2017 | 84° | 59° | 72° | — | — |
| 2016 | 87° | 63° | 75° | 0.2" | — |
| 2015 | 87° | 70° | 78° | 1.5" | — |
| 2014 | 81° | 56° | 68° | — | — |
| 2013 | 83° | 56° | 69° | — | — |
| 2012 | 94° | 69° | 81° | — | — |
| 2011 | 86° | 67° | 76° | 0.03" | — |
| 2010 | 86° | 63° | 74° | — | — |
| 2009 | 77° | 64° | 71° | — | — |
| 2008 | 86° | 55° | 71° | — | — |
| 2007 | 82° | 52° | 67° | 0.03" | — |
| 2006 | 83° | 60° | 71° | — | — |
| 2005 | 83° | 52° | 67° | — | — |
| 2004 | 79° | 48° | 63° | — | — |
| 2003 | 65° | 58° | 61° | 0.3" | — |
| 2002 | 83° | 58° | 70° | — | — |
| 2001 | 77° | 64° | 71° | — | — |
| 2000 | 79° | 60° | 69° | 2.13" | — |
| 1999 | 70° | 55° | 62° | 0.25" | — |
| 1998 | 88° | 65° | 76° | — | — |
| 1997 | 91° | 65° | 78° | — | — |
| 1996 | 85° | 65° | 75° | — | — |
| 1995 | 77° | 63° | 70° | — | — |
| 1994 | 85° | 67° | 76° | — | — |
| 1993 | 85° | 69° | 77° | 2.01" | — |
| 1992coldest | 64° | 52° | 58° | — | — |
| 1991 | 92° | 62° | 77° | — | — |
| 1990 | 82° | 63° | 72° | 0.2" | — |
| 1989 | 84° | 68° | 76° | 4.19" | — |
| 1988 | 93° | 69° | 81° | — | — |
| 1987 | 76° | 71° | 73° | 2.21" | — |
| 1986 | 79° | 54° | 66° | — | — |
| 1985 | 78° | 52° | 65° | — | — |
| 1984 | 81° | 59° | 70° | — | — |
| 1983 | 75° | 61° | 68° | 0.13" | — |
| 1982 | 80° | 55° | 68° | — | — |
| 1981 | 87° | 63° | 75° | 2.84" | — |
| 1980 | 84° | 58° | 71° | — | — |
| 1979 | 80° | 53° | 67° | — | — |
| 1978 | 85° | 64° | 74° | 2.77" | — |
| 1977 | 79° | 58° | 68° | — | — |
| 1976 | 82° | 69° | 76° | 0.36" | — |
| 1975 | 79° | 56° | 67° | — | — |
| 1974 | 79° | 65° | 72° | — | — |
| 1973 | 80° | 68° | 74° | — | — |
| 1972 | 75° | 69° | 72° | 1.52" | — |
| 1971 | 85° | 63° | 74° | 0.05" | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP