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The climate in Allentown, Pennsylvania is temperate, which means that the city experiences four, distinct season changes. Although it can be visited throughout the year, certain months are more comfortable than others.
On average, the hottest months of the year are July and August, during which time the daily high temperatures will generally hover in the low to mid 80’s. The nighttime temperatures during these months will generally drop to the mid to lower 60’s. Although at first glance these temperatures may seem mild, during much of the year, humidity makes it seem much hotter than the thermometer will read.
The coldest months of the year on average are January and February, during which time the daily high temperatures will only reach the mid to upper 30’s. The nighttime temperatures during these months will generally drop to the mid teens. Winters in Allentown can be fairly harsh, with snowstorms frequently passing through the city.
Allentown is a relatively wet city (on average receiving over 45 inches of precipitation per year), and the chance for rain or snow are good throughout the year. However, May through September is seasonally the wettest time.For more weather information about Allentown, check out this Ten Day Forecast , and this Monthly Weather Averages page.