Climate averages 1991–2020
Allentown weather
in April.
A mild, wet month: the 7th warmest and the 7th driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
April is a mild month in Allentown: daytime highs average 15.8°C and nights cool to about 4.5°C. By daytime temperature it is the 7th warmest of the 12 months.
Expect about 99 mm of rain on roughly 11 days, which makes April a wet month (the 7th driest of the 12 months). Daylight, from sunrise to sunset, lasts about 13 h 16 min on an average April day.
The nearest other city in this atlas is Bethlehem, United States (10 km away). In April its highs average 15.7°C, about as warm as Allentown, with 99 mm of rain.
Among the 498 cities listed in the United States, Allentown ranks joint 340th of 498 for the warmest April highs and joint 353rd of 498 for the driest April (rainfall, lowest first). The mean April high of those 498 cities is 19.4°C; Allentown is 3.6°C cooler than that mean.
From April to May, average highs rise by 5.6°C to 21.3°C, and monthly rainfall falls from 99 mm to 95 mm.
The annual picture
April in context
Monthly rainfall
Average total · mmAverages from hourly ERA5 reanalysis data. Actual weather varies from year to year. How these numbers are calculated
Every month, side by side
Allentown climate table
| Month | Average highHigh / low | Average low | Rainfall mm/month | Rain days ≥1 mm/day | Daylight hours/dayDaylight h/day |
|---|---|---|---|---|---|
| January | 2.8°C-5.7°C | -5.7°C | 87 | 9.5 | 9.610 h |
| February | 4.4°C-5.2°C | -5.2°C | 77 | 9.1 | 10.611 h |
| March | 9.1°C-1.3°C | -1.3°C | 103 | 11.0 | 11.912 h |
| April, selected | 15.8°C4.5°C | 4.5°C | 99 | 10.6 | 13.313 h |
| May | 21.3°C10.4°C | 10.4°C | 95 | 11.5 | 14.414 h |
| June | 26.2°C15.6°C | 15.6°C | 103 | 11.3 | 15.015 h |
| July | 29.1°C18.6°C | 18.6°C | 98 | 11.2 | 14.815 h |
| August | 28.1°C17.9°C | 17.9°C | 93 | 10.1 | 13.814 h |
| September | 24.1°C14.1°C | 14.1°C | 113 | 8.8 | 12.513 h |
| October | 17.2°C7.8°C | 7.8°C | 100 | 8.9 | 11.211 h |
| November | 10.8°C2.1°C | 2.1°C | 81 | 8.0 | 10.010 h |
| December | 5.4°C-2.4°C | -2.4°C | 101 | 9.4 | 9.39 h |
Rainfall is the average of the 30 separate monthly totals. A rain day is a local calendar day with at least 1 mm of precipitation. Daylight is the calculated sunrise-to-sunset length, not measured sunshine.
Compare places
April in nearby cities
- Bethlehem, United States in AprilUnited States · 10 kmHigh 15.7°C · Low 4.5°C · 99 mm rain
- Reading, United States in AprilUnited States · 48 kmHigh 16.4°C · Low 5.7°C · 96 mm rain
- Trenton in AprilUnited States · 77 kmHigh 16.6°C · Low 5.9°C · 92 mm rain
- Philadelphia in AprilUnited States · 78 kmHigh 17.2°C · Low 6.7°C · 92 mm rain
- Camden in AprilUnited States · 82 kmHigh 17.2°C · Low 6.6°C · 89 mm rain
- Cherry Hill in AprilUnited States · 84 kmHigh 17.0°C · Low 6.8°C · 89 mm rain
- Scranton in AprilUnited States · 90 kmHigh 14.2°C · Low 3.7°C · 89 mm rain
- Edison in AprilUnited States · 92 kmHigh 16.0°C · Low 6.0°C · 93 mm rain
Read the numbers correctly
Climate, not a promise.
These patterns help compare months. They cannot tell you the weather on a specific day of your trip.
Sources, method and limitsHow these numbers are made (what the highs, lows and rain days mean, the sources and the model cell used for Allentown) is explained once on the Allentown year overview and on the Sources, method and limits page.