March is one of the cooler months of the year in Allentown, with average highs near 8.7°C and lows around -2.1°C (mean 3.3°C). It is about average for rainfall, averaging 93 mm of rainfall and 82% relative humidity across the period.
March is one of the cooler months of the year in Allentown. Across 45 years of records, the warmest March in Allentown was 2012 — when the month averaged 8.4°C — while the coldest was 1984 at -1°C. Typical March days reach 8.7°C with nights near -2.1°C. The long-term trend is warming, about 0.4°C per decade.
March is about average for rainfall in Allentown, averaging 93 mm of rainfall. The wettest March on record was 1993 with 172 mm, while the driest was 2006 at 23 mm.
Relative humidity in Allentown during March averages 82%. The most humid March was 1993 at 91%, and the least humid was 2025 at 75%.
March receives about 3.7 kWh/m²/day of solar energy in Allentown. The sunniest March was 2006 at 4.3 kWh/m²/day, and the cloudiest was 2001 at 3.2.
Average wind speed in Allentown during March is 0.9 m/s. The windiest March was 1999 at 1.2 m/s, while the calmest were 2009, 2012 and 2020, among others at 0.8 m/s.
Ranked against the other 11 months using 1981–2025 averages.
| Metric | 1980s | 1990s | 2000s | 2010s | 2020s | Change |
|---|---|---|---|---|---|---|
| Avg Temp | 2.7°C | 2.6°C | 3.5°C | 3.0°C | 5.4°C | +2.7°C |
| Avg High | 8.2°C | 7.9°C | 9.0°C | 8.2°C | 11.1°C | +2.9°C |
| Avg Low | -2.8°C | -2.5°C | -2.0°C | -2.2°C | -0.4°C | +2.4°C |
| Avg Rain | 75 mm | 107 mm | 90 mm | 96 mm | 97 mm | +22 mm |
March temperatures in Allentown have risen by about 3°C between 1981–1985 and 2021–2025.
March has ranged from a record low of -22.5°C (2015) to a record high of 26.2°C (1998).
Rainfall in March is about average for rainfall, averaging 93 mm, with a wettest year of 172 mm.
A quieter season to visit Allentown
If your dates are flexible, the more temperate months of August and June tend to be the most comfortable for visiting Allentown. That said, March — with days averaging 8.7°C and nights around -2.1°C (mean 3.3°C) and higher rainfall (93 mm) — can still be rewarding for travellers who don't mind the cooler conditions, and often means fewer crowds.
| Year | Avg High | Avg Temp | Avg Low | Hottest Day | Coldest Day | Rainfall | Humidity | Wind | Solar |
|---|---|---|---|---|---|---|---|---|---|
| 2025 | 13.2°C | 6.5°C | -0.2°C | 25.4°C | -8.6°C | 90 mm | 75% | 1 m/s | 4 |
| 2024 | 11.2°C | 5.9°C | 0.6°C | 22.6°C | -4.7°C | 163 mm | 83% | 0.9 m/s | 3.7 |
| 2023 | 9.5°C | 4.1°C | -1.3°C | 16.6°C | -5.6°C | 68 mm | 80% | 1 m/s | 3.7 |
| 2022 | 10.1°C | 4.6°C | -0.9°C | 22.3°C | -7.9°C | 78 mm | 80% | 0.9 m/s | 3.6 |
| 2021 | 10.9°C | 5.0°C | -1.0°C | 21.6°C | -8.8°C | 91 mm | 80% | 1 m/s | 4.2 |
| 2020 | 11.9°C | 6.3°C | 0.7°C | 22.0°C | -6.0°C | 93 mm | 82% | 0.8 m/s | 3.5 |
| 2019 | 6.9°C | 1.7°C | -3.5°C | 20.1°C | -14.2°C | 106 mm | 85% | 0.9 m/s | 3.8 |
| 2018 | 5.7°C | 1.4°C | -2.9°C | 16.9°C | -6.3°C | 101 mm | 83% | 1 m/s | 3.6 |
| 2017 | 6.5°C | 1.5°C | -3.4°C | 19.5°C | -13.9°C | 122 mm | 79% | 1.1 m/s | 3.6 |
| 2016 | 12.4°C | 6.5°C | 0.6°C | 23.5°C | -5.4°C | 47 mm | 81% | 0.9 m/s | 3.9 |
| 2015 | 5.0°C | -0.1°C | -5.2°C | 17.3°C | -22.5°C | 116 mm | 83% | 0.9 m/s | 3.4 |
| 2014 | 5.4°C | 0.0°C | -5.5°C | 15.9°C | -15.6°C | 69 mm | 79% | 1 m/s | 3.7 |
| 2013 | 6.2°C | 1.7°C | -2.9°C | 13.3°C | -6.5°C | 68 mm | 81% | 1 m/s | 3.4 |
| 2012 🔥 | 14.2°C | 8.4°C | 2.6°C | 24.4°C | -5.5°C | 26 mm | 82% | 0.8 m/s | 4 |
| 2011 | 7.8°C | 2.7°C | -2.5°C | 20.4°C | -7.3°C | 166 mm | 83% | 0.9 m/s | 3.8 |
| 2010 | 11.7°C | 6.3°C | 0.8°C | 20.6°C | -5.5°C | 133 mm | 84% | 1 m/s | 3.5 |
| 2009 | 9.4°C | 3.8°C | -1.7°C | 20.3°C | -13.2°C | 39 mm | 80% | 0.8 m/s | 3.7 |
| 2008 | 9.0°C | 3.6°C | -1.9°C | 16.7°C | -5.7°C | 131 mm | 82% | 1 m/s | 3.7 |
| 2007 | 8.3°C | 2.6°C | -3.1°C | 22.3°C | -13.4°C | 108 mm | 84% | 0.9 m/s | 3.8 |
| 2006 | 9.0°C | 3.6°C | -1.8°C | 20.3°C | -7.3°C | 23 mm | 78% | 0.9 m/s | 4.3 |
| 2005 | 5.6°C | 0.8°C | -4.0°C | 15.2°C | -12.5°C | 102 mm | 85% | 0.9 m/s | 3.3 |
| 2004 | 9.8°C | 4.5°C | -0.9°C | 20.5°C | -6.0°C | 59 mm | 83% | 0.9 m/s | 3.5 |
| 2003 | 9.5°C | 3.6°C | -2.3°C | 19.5°C | -13.1°C | 96 mm | 85% | 0.9 m/s | 3.8 |
| 2002 | 10.0°C | 4.4°C | -1.2°C | 20.9°C | -7.6°C | 101 mm | 76% | 1 m/s | 3.4 |
| 2001 | 6.7°C | 1.8°C | -3.1°C | 12.8°C | -7.6°C | 108 mm | 81% | 1 m/s | 3.2 |
| 2000 | 12.2°C | 6.0°C | -0.2°C | 23.7°C | -6.6°C | 131 mm | 81% | 0.9 m/s | 3.9 |
| 1999 | 7.9°C | 2.3°C | -3.3°C | 18.7°C | -10.5°C | 85 mm | 78% | 1.2 m/s | 4.1 |
| 1998 | 9.2°C | 4.4°C | -0.3°C | 26.2°C | -8.3°C | 114 mm | 85% | 0.9 m/s | 3.7 |
| 1997 | 8.3°C | 3.2°C | -1.8°C | 19.3°C | -6.0°C | 108 mm | 83% | 1 m/s | 3.5 |
| 1996 | 5.6°C | 0.4°C | -4.8°C | 15.4°C | -15.0°C | 104 mm | 83% | 0.9 m/s | 3.7 |
| 1995 | 10.3°C | 4.2°C | -1.9°C | 19.7°C | -12.8°C | 58 mm | 82% | 0.8 m/s | 4 |
| 1994 | 5.6°C | 1.0°C | -3.6°C | 18.5°C | -9.8°C | 152 mm | 89% | 1 m/s | 3.7 |
| 1993 🌧️ | 5.1°C | 0.3°C | -4.4°C | 17.3°C | -20.7°C | 172 mm | 91% | 0.9 m/s | 3.4 |
| 1992 | 6.7°C | 1.7°C | -3.4°C | 16.9°C | -10.6°C | 111 mm | 83% | 1 m/s | 3.5 |
| 1991 | 9.5°C | 4.3°C | -1.0°C | 19.0°C | -6.5°C | 109 mm | 84% | 1 m/s | 3.4 |
| 1990 | 10.3°C | 4.7°C | -0.9°C | 23.4°C | -11.6°C | 54 mm | 82% | 0.9 m/s | 3.7 |
| 1989 | 7.6°C | 2.0°C | -3.7°C | 23.7°C | -16.9°C | 88 mm | 84% | 0.9 m/s | 3.4 |
| 1988 | 9.1°C | 3.3°C | -2.6°C | 20.2°C | -11.6°C | 60 mm | 81% | 0.9 m/s | 4 |
| 1987 | 10.3°C | 4.5°C | -1.3°C | 20.7°C | -9.9°C | 54 mm | 81% | 0.9 m/s | 4.1 |
| 1986 | 9.4°C | 3.2°C | -2.9°C | 21.5°C | -13.2°C | 69 mm | 83% | 0.9 m/s | 4.2 |
| 1985 | 9.6°C | 3.9°C | -1.8°C | 21.3°C | -6.8°C | 56 mm | 76% | 1 m/s | 4 |
| 1984 ❄️ | 3.6°C | -1.0°C | -5.6°C | 14.2°C | -15.4°C | 115 mm | 86% | 1 m/s | 3.6 |
| 1983 | 9.1°C | 4.1°C | -0.8°C | 16.2°C | -6.8°C | 130 mm | 81% | 1.1 m/s | — |
| 1982 | 7.6°C | 2.2°C | -3.2°C | 16.6°C | -10.5°C | 67 mm | 83% | 0.9 m/s | — |
| 1981 | 7.2°C | 1.9°C | -3.4°C | 20.8°C | -9.4°C | 35 mm | 79% | 1 m/s | — |
Actual recorded March data for each year, 1981–2025 — sourced from NASA POWER.
The average high in March is around 8.7°C with lows near -2.1°C (mean 3.3°C), based on 45 years of NASA POWER data.
March averages 93 mm of rainfall in Allentown, about average for rainfall. The wettest on record was 172 mm in 1993.
The hottest March reached 26.2°C in 1998. The coldest dipped to -22.5°C in 2015.
Comparing the earliest years on record (1981–1985) with the most recent (2021–2025), average March temperatures have risen by about 3°C. Daytime highs moved from 7.4°C to 11°C and overnight lows from -3°C to -0.6°C over the same span.
March is one of the cooler months of the year in Allentown and about average for rainfall, so plan for around 8.7°C daytime highs and -2.1°C at night.
Not quite — March is the 4th coolest month in Allentown, averaging 3.3°C.
For March in Allentown, pack warm layers and a jacket for chilly mornings, with typical highs of 8.7°C and lows of -2.1°C. Bring an umbrella or light rain jacket too.
Relative humidity in March averages 82% — quite humid.
Average wind speed in March is 0.9 m/s. The windiest March on record averaged 1.2 m/s (1999).
The wettest March on record was 1993 with 172 mm. On average, March sees 93 mm.
All figures are derived from NASA POWER (Prediction Of Worldwide Energy Resources), based on MERRA-2 satellite reanalysis, covering 1981–2025.
Explore how the weather in Allentown behaves each March, based on 45 years of NASA POWER climate data from 1981 to 2025. This page breaks down average temperatures, rainfall, humidity, wind and solar radiation for March specifically, along with year-by-year records and how the month has changed over the decades.
