Zip 18103 (Allentown, PA) Climate

The climate of Allentown, PA in 18103 is generally temperate. The summers are hot and humid with temperatures ranging from the mid-80s to low 90s. Winters are cold and snowy with temperatures typically ranging from the 20s to the 40s. The average yearly precipitation is about 42 inches, mostly falling as rain in summer months and snow in winter months. Spring and fall offer mild temperatures for outdoor activities.

Allentown (zip 18103), Pennsylvania gets 47 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Allentown (zip 18103) averages 29 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 204 sunny days per year in Allentown (zip 18103). The US average is 205 sunny days.

Allentown (zip 18103) gets some kind of precipitation, on average, 122 days per year. Precipitation is rain, snow, sleet, or hail that falls to the ground. In order for precipitation to be counted you have to get at least .01 inches on the ground to measure.

Weather Highlights

Summer High: the July high is around 86 degrees
Winter Low: the January low is 21
Rain: averages 47 inches of rain a year
Snow: averages 29 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 18103 zip code is 7.1 (10=best), which means it is more comfortable than most places in Pennsylvania.

8.7 Summer - 5.2 Winter

June, September and May are the most pleasant months in the 18103 zip code, while January and February are the least comfortable months.

Climate	Allentown, Pennsylvania	United States
	Unlock	38.1 in.
	29.2 in.	Unlock
	Unlock	106.2 days
	204 days	Unlock
	85.8°	85.8°
	Unlock	21.7°
	7.1	Unlock
	Unlock	4.3
	338 ft.	Unlock

Climate

YOU SHOULD KNOW

Many people confuse weather and climate but they are different. Weather is the conditions of the atmosphere over a short period of time, and climate is how the atmosphere is over long periods of time.

Weather is how the atmosphere is behaving and its effects upon life and human activities. Weather can change from minute-to-minute. Most people think of weather in terms of temperature, humidity, precipitation, cloudiness, brightness, visibility, wind, and atmospheric pressure.

Climate is the description of the long-term pattern of weather in a place. Climate can mean the average weather for a particular region and time period taken over 30 years. Climate is the average of weather over time.

July is the hottest month for the 18103 zip code with an average high temperature of 85.8°, which ranks it as one of the hottest places in Pennsylvania. In the 18103 zip code, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for the 18103 zip code are September, June and May.

In the 18103 zip code, there are 20.4 days annually when the high temperature is over 90°, which is one of the hottest places in Pennsylvania.

January has the coldest nighttime temperatures for the 18103 zip code with an average of 20.9°. This is warmer than most places in Pennsylvania.

In the 18103 zip code, there are 113.5 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.

In the 18103 zip code, there are 1.0 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.

The humidity is usually comfortable in the 18103 zip code but some summer months can be sticky or muggy. July is the most humid month, though humidity is low for most of the year. The most humid months are July, August and June.

July is the wettest month in the 18103 zip code with 5.0 inches of rain, and the driest month is February with 2.7 inches. The wettest season is Autumn with 28% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 46.6 inches in the 18103 zip code means that it is wetter than most places in Pennsylvania.

May is the rainiest month in the 18103 zip code with 12.2 days of rain, and September is the driest month with only 8.8 rainy days. There are 121.6 rainy days annually in the 18103 zip code, which is less rainy than most places in Pennsylvania. The rainiest season is Summer when it rains 28% of the time and the driest is Winter with only a 23% chance of a rainy day.

An annual snowfall of 29.2 inches in the 18103 zip code means that it is about average compared to other places in Pennsylvania. February is the snowiest month in the 18103 zip code with 9.7 inches of snow, and 6 months of the year have significant snowfall.

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