Weather on April 20
Allentown, PA
55 Years of Data
About This Date
April 20th in Allentown, PA typically brings mild spring weather, with average highs around 66°F and lows near 42°F. Over 56 years of records, the warmest April 20th was in 1976 (73°F average), while the coldest was 1983 (39°F) — a 34°F range across recorded history. Rain or other precipitation has occurred on about 29% of April 20th dates historically, with the wettest April 20th recording 3.78" 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 20th in Allentown, PA? Great weather for outdoor activities.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 50° | 29° | 39° | — | — |
| 2025 | 71° | 47° | 59° | — | — |
| 2024 | 67° | 39° | 53° | 0.05" | — |
| 2023 | 73° | 42° | 58° | — | — |
| 2022 | 58° | 37° | 47° | — | — |
| 2021 | 74° | 35° | 54° | — | — |
| 2020 | 62° | 40° | 51° | — | — |
| 2019 | 74° | 58° | 66° | 3.78" | — |
| 2018 | 52° | 36° | 44° | — | — |
| 2017 | 75° | 52° | 63° | 0.56" | — |
| 2016 | 72° | 41° | 56° | — | — |
| 2015 | 62° | 47° | 54° | 1.85" | — |
| 2014 | 62° | 38° | 50° | — | — |
| 2013 | 56° | 38° | 47° | 0.08" | — |
| 2012 | 75° | 42° | 59° | — | — |
| 2011 | 68° | 45° | 56° | — | — |
| 2010 | 68° | 35° | 52° | — | — |
| 2009 | 47° | 42° | 44° | 1.27" | — |
| 2008 | 67° | 53° | 60° | — | — |
| 2007 | 71° | 35° | 53° | — | — |
| 2006 | 83° | 50° | 66° | — | — |
| 2005 | 84° | 57° | 71° | — | — |
| 2004 | 72° | 51° | 61° | — | — |
| 2003 | 69° | 34° | 51° | — | — |
| 2002 | 68° | 45° | 56° | 0.03" | — |
| 2001 | 61° | 32° | 46° | 0.03" | — |
| 2000 | 67° | 52° | 59° | — | — |
| 1999 | 51° | 32° | 42° | 1.14" | — |
| 1998 | 59° | 43° | 51° | 0.05" | — |
| 1997 | 54° | 38° | 46° | 0.03" | — |
| 1996 | 74° | 48° | 61° | — | — |
| 1995 | 66° | 49° | 57° | — | — |
| 1994 | 63° | 44° | 53° | — | — |
| 1993 | 75° | 56° | 65° | — | — |
| 1992 | 57° | 43° | 50° | — | — |
| 1991 | 48° | 42° | 45° | — | — |
| 1990 | 66° | 45° | 55° | 0.08" | — |
| 1989 | 63° | 35° | 49° | — | — |
| 1988 | 57° | 34° | 45° | — | — |
| 1987 | 76° | 48° | 62° | — | — |
| 1986 | 70° | 39° | 54° | — | — |
| 1985 | 75° | 56° | 65° | 0.23" | — |
| 1984 | 61° | 39° | 50° | — | — |
| 1983coldest | 46° | 32° | 39° | — | — |
| 1982 | 68° | 39° | 54° | — | — |
| 1981 | 53° | 33° | 43° | — | — |
| 1980 | 74° | 40° | 57° | 0.08" | — |
| 1979 | 65° | 33° | 49° | — | — |
| 1978 | 60° | 46° | 53° | 1.6" | — |
| 1977 | 69° | 49° | 59° | — | — |
| 1976warmest | 88° | 58° | 73° | — | — |
| 1975 | 56° | 43° | 49° | — | — |
| 1974 | 62° | 31° | 46° | — | — |
| 1973 | 68° | 45° | 56° | — | — |
| 1972 | 72° | 39° | 55° | 0.97" | — |
| 1971 | 70° | 44° | 57° | — | — |
Allentown, PA Temperature Range by Month
Average monthly highs and lows. The shaded band shows the typical daily temperature range.
Allentown, PA Monthly Precipitation
Average rainfall and snowfall per month, in inches.
Allentown, PA Daily Temperature Calendar
Average daily high temperature for every day of the year. Each cell is the climatological mean for that calendar day across 55 years of NOAA data.
Best Time to Visit Allentown, PA
Allentown, PA has no months that meet our "pleasant" threshold — every season has tradeoffs.