Climate averages 1991–2020
Allentown weather
in January.
A cold, moderately wet month: the coolest and the 3rd driest of the year.
Long-term climate patterns, not a forecast for a particular trip.
January is a cold month in Allentown: daytime highs average 2.8°C and nights cool to about -5.7°C. By daytime temperature it is the coolest month of the year.
Expect about 87 mm of rain on roughly 10 days, which makes January a moderately wet month (the 3rd driest of the 12 months). Daylight, from sunrise to sunset, lasts about 9 h 37 min on an average January day.
The nearest other city in this atlas is Bethlehem, United States (10 km away). In January its highs average 2.8°C, about as warm as Allentown, with 90 mm of rain.
Among the 498 cities listed in the United States, Allentown ranks joint 371st of 498 for the warmest January highs and joint 331st of 498 for the driest January (rainfall, lowest first). The mean January high of those 498 cities is 9.5°C; Allentown is 6.7°C cooler than that mean.
From January to February, average highs rise by 1.7°C to 4.4°C, and monthly rainfall falls from 87 mm to 77 mm.
The annual picture
January 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, selected | 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 | 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
January in nearby cities
- Bethlehem, United States in JanuaryUnited States · 10 kmHigh 2.8°C · Low -5.7°C · 90 mm rain
- Reading, United States in JanuaryUnited States · 48 kmHigh 3.4°C · Low -4.4°C · 82 mm rain
- Trenton in JanuaryUnited States · 77 kmHigh 4.2°C · Low -3.8°C · 83 mm rain
- Philadelphia in JanuaryUnited States · 78 kmHigh 4.5°C · Low -3.3°C · 82 mm rain
- Camden in JanuaryUnited States · 82 kmHigh 4.7°C · Low -3.2°C · 81 mm rain
- Cherry Hill in JanuaryUnited States · 84 kmHigh 4.6°C · Low -3.0°C · 81 mm rain
- Scranton in JanuaryUnited States · 90 kmHigh 0.9°C · Low -7.3°C · 75 mm precipitation
- Edison in JanuaryUnited States · 92 kmHigh 3.7°C · Low -4.1°C · 83 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.