Weather on May 20
Allentown, PA
55 Years of Data
Avg High
73°F
Avg Low
50°F
Warmest
1996
77°F avg
Coldest
2002
43°F avg
About This Date
May 20th in Allentown, PA typically brings pleasant spring weather, with average highs around 73°F and lows near 50°F. Over 55 years of records, the warmest May 20th was in 1996 (77°F average), while the coldest was 2002 (43°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 51% of May 20th dates historically, with the wettest May 20th recording 4.88" of rain. The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
The last decade has been 3.8°F warmer on this date compared to 20-30 years ago.
Planning for May 20th 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 | 66° | 41° | 54° | — | — |
| 2024 | 81° | 53° | 67° | — | — |
| 2023 | 68° | 51° | 60° | 0.13" | — |
| 2022 | 79° | 52° | 65° | 1.07" | — |
| 2021 | 83° | 56° | 69° | — | — |
| 2020 | 66° | 40° | 53° | — | — |
| 2019 | 86° | 66° | 76° | 0.66" | — |
| 2018 | 80° | 58° | 69° | 0.08" | — |
| 2017 | 66° | 49° | 57° | 0.46" | — |
| 2016 | 77° | 41° | 59° | — | — |
| 2015 | 63° | 48° | 55° | — | — |
| 2014 | 77° | 43° | 60° | — | — |
| 2013 | 80° | 58° | 69° | — | — |
| 2012 | 84° | 51° | 68° | — | — |
| 2011 | 68° | 54° | 61° | 0.33" | — |
| 2010 | 81° | 53° | 67° | — | — |
| 2009 | 81° | 42° | 61° | — | — |
| 2008 | 52° | 36° | 44° | 1.17" | — |
| 2007 | 74° | 51° | 62° | 0.05" | — |
| 2006 | 67° | 43° | 55° | — | — |
| 2005 | 58° | 41° | 49° | 1.32" | — |
| 2004 | 74° | 55° | 64° | — | — |
| 2003 | 79° | 41° | 60° | 0.05" | — |
| 2002coldest | 54° | 32° | 43° | 0.03" | — |
| 2001 | 63° | 51° | 57° | 0.05" | — |
| 2000 | 50° | 45° | 47° | 1.6" | — |
| 1999 | 71° | 50° | 61° | — | — |
| 1998 | 89° | 59° | 74° | — | — |
| 1997 | 69° | 49° | 59° | 0.1" | — |
| 1996warmest | 92° | 62° | 77° | — | — |
| 1995 | 76° | 46° | 61° | — | — |
| 1994 | 64° | 47° | 55° | — | — |
| 1993 | 61° | 46° | 53° | 0.46" | — |
| 1992 | 78° | 40° | 59° | — | — |
| 1991 | 72° | 43° | 57° | — | — |
| 1990 | 69° | 51° | 60° | 0.08" | — |
| 1989 | 84° | 55° | 70° | 0.03" | — |
| 1988 | 70° | 57° | 63° | 0.03" | — |
| 1987 | 51° | 46° | 49° | 1.07" | — |
| 1986 | 73° | 65° | 69° | 0.18" | — |
| 1985 | 83° | 45° | 64° | — | — |
| 1984 | 80° | 57° | 69° | 4.88" | — |
| 1983 | 75° | 56° | 65° | 1.37" | — |
| 1982 | 82° | 60° | 71° | 0.86" | — |
| 1981 | 73° | 44° | 59° | — | — |
| 1980 | 74° | 58° | 66° | 0.03" | — |
| 1979 | 71° | 57° | 64° | 0.05" | — |
| 1978 | 87° | 55° | 71° | — | — |
| 1977 | 84° | 60° | 72° | — | — |
| 1976 | 77° | 47° | 62° | 0.74" | — |
| 1975 | 86° | 58° | 72° | — | — |
| 1974 | 73° | 48° | 61° | — | — |
| 1973 | 60° | 52° | 56° | 0.69" | — |
| 1972 | 64° | 56° | 60° | 0.86" | — |
| 1971 | 72° | 51° | 61° | — | — |
55 years of data from ALLENTOWN LEHIGH VLY INTL AP