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Allentown is located in the east central section of Pennsylvania in the Lehigh River Valley between Blue Mountain to the north and South Mountain. The terrain is rolling with many small streams. Temperatures are usually moderate, although because of the mountain ranges winter temperatures are sometimes 10 to 15 degrees lower than in Philadelphia, just 50 miles to the south. Freezing rain is a common problem in winter. Precipitation is ample, especially during the summer, when high humidity can cause periods of discomfort.
| 17.4 square miles (2000) | |
| 387 feet above sea level | |
| January, 26.9° F; August, 71° F; annual average, 49° F | |
| 45.6 inches of rain; 32.4 inches of snow |
