Weather on March 21
Allentown, PA
55 Years of Data
Avg High
50°F
Avg Low
32°F
Warmest
2012
62°F avg
Coldest
1986
24°F avg
About This Date
March 21st in Allentown, PA typically brings cool spring weather, with average highs around 50°F and lows near 32°F. Over 56 years of records, the warmest March 21st was in 2012 (62°F average), while the coldest was 1986 (24°F) — a 38°F range across recorded history. Precipitation has occurred on 34% of recorded March 21st dates, with snow falling 5% of the time (heaviest snowfall: 13.2"). The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
The last decade has been 2.5°F warmer on this date compared to 20-30 years ago.
Planning for March 21st in Allentown, PA? Bring layers as temperatures can vary throughout the day. Consider bringing rain gear or an umbrella.
| Year | High | Low | Avg | Precip | Snow |
|---|---|---|---|---|---|
| 2026 | 53° | 43° | 48° | — | — |
| 2025 | 52° | 30° | 41° | — | — |
| 2024 | 41° | 25° | 33° | — | — |
| 2023 | 61° | 22° | 42° | — | — |
| 2022 | 61° | 36° | 48° | — | — |
| 2021 | 64° | 23° | 44° | — | — |
| 2020 | 63° | 33° | 48° | — | — |
| 2019 | 49° | 41° | 45° | 2.62" | — |
| 2018 | 37° | 29° | 33° | 2.41" | 13.2" |
| 2017 | 58° | 36° | 47° | — | — |
| 2016 | 50° | 26° | 38° | — | — |
| 2015 | 46° | 27° | 37° | — | — |
| 2014 | 53° | 30° | 42° | — | — |
| 2013 | 37° | 26° | 32° | — | — |
| 2012warmest | 69° | 55° | 62° | — | — |
| 2011 | 42° | 33° | 38° | 1.27" | 0.3" |
| 2010 | 74° | 43° | 58° | — | — |
| 2009 | 48° | 20° | 34° | — | — |
| 2008 | 47° | 31° | 39° | — | — |
| 2007 | 43° | 20° | 31° | — | — |
| 2006 | 42° | 20° | 31° | — | — |
| 2005 | 46° | 30° | 38° | — | — |
| 2004 | 45° | 28° | 36° | — | — |
| 2003 | 62° | 45° | 53° | 0.36" | — |
| 2002 | 56° | 28° | 42° | — | — |
| 2001 | 42° | 38° | 40° | 2.24" | — |
| 2000 | 41° | 37° | 39° | 2.69" | — |
| 1999 | 45° | 27° | 36° | 2.54" | — |
| 1998 | 41° | 31° | 36° | 1.78" | — |
| 1997 | 55° | 27° | 41° | — | — |
| 1996 | 44° | 34° | 39° | — | — |
| 1995 | 59° | 47° | 53° | 1.09" | — |
| 1994 | 41° | 26° | 34° | 1.65" | — |
| 1993 | 44° | 33° | 39° | 0.48" | 1.6" |
| 1992 | 36° | 20° | 28° | — | — |
| 1991 | 53° | 35° | 44° | — | — |
| 1990 | 52° | 34° | 43° | — | — |
| 1989 | 45° | 30° | 37° | 0.43" | — |
| 1988 | 35° | 18° | 26° | — | — |
| 1987 | 48° | 31° | 39° | — | — |
| 1986coldest | 35° | 13° | 24° | — | — |
| 1985 | 47° | 25° | 36° | — | — |
| 1984 | 50° | 35° | 43° | 0.76" | — |
| 1983 | 54° | 38° | 46° | 3.61" | — |
| 1982 | 45° | 38° | 41° | 0.15" | — |
| 1981 | 41° | 27° | 34° | — | — |
| 1980 | 58° | 39° | 48° | 3.61" | — |
| 1979 | 65° | 38° | 51° | — | — |
| 1978 | 67° | 37° | 52° | 0.1" | — |
| 1977 | 53° | 36° | 44° | — | — |
| 1976 | 73° | 43° | 58° | 0.18" | — |
| 1975 | 52° | 33° | 42° | — | — |
| 1974 | 45° | 34° | 39° | 3.05" | — |
| 1973 | 44° | 24° | 34° | — | — |
| 1972 | 52° | 27° | 39° | — | — |
| 1971 | 44° | 29° | 36° | — | — |
56 years of data from ALLENTOWN LEHIGH VLY INTL AP