Zip 15857 (St. Marys, PA) Climate

St. Marys, PA has a humid continental climate with hot summers and cold winters. The average high temperature in the summer months is around 80°F while the average low in the winter months is around 15°F. The area gets an average of 35 inches of precipitation per year, spread out mostly evenly throughout the seasons. Snowfall is also common during the winter months, averaging about 41 inches annually.

St. Marys (zip 15857), Pennsylvania gets 45 inches of rain, on average, per year. The US average is 38 inches of rain per year.

St. Marys (zip 15857) averages 69 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 163 sunny days per year in St. Marys (zip 15857). The US average is 205 sunny days.

St. Marys (zip 15857) gets some kind of precipitation, on average, 167 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 79 degrees
Winter Low: the January low is 13
Rain: averages 45 inches of rain a year
Snow: averages 69 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for the 15857 zip code is 6.2 (10=best), which means it is one of the least comfortable places in Pennsylvania.

8.9 Summer - 3.5 Winter

August, July and June are the most pleasant months in the 15857 zip code, while January and December are the least comfortable months.

Climate	St. Marys, Pennsylvania	United States
	Unlock	38.1 in.
	68.8 in.	Unlock
	Unlock	106.2 days
	163 days	Unlock
	78.7°	85.8°
	Unlock	21.7°
	6.2	Unlock
	Unlock	4.3
	1704 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 15857 zip code with an average high temperature of 78.7°, which ranks it as one of the coolest places in Pennsylvania. In the 15857 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 15857 zip code are August, July and June.

In the 15857 zip code, there are 1.0 days annually when the high temperature is over 90°, which is one of the coolest places in Pennsylvania.

January has the coldest nighttime temperatures for the 15857 zip code with an average of 13.1°. This is one of the coldest places in Pennsylvania.

In the 15857 zip code, there are 167.0 days annually when the nighttime low temperature falls below freezing, which is one of the coldest places in Pennsylvania.

In the 15857 zip code, there are 12.6 days annually when the nighttime low temperature falls below zero°, which is one of the coldest places in Pennsylvania.

Humidity in the 15857 zip code is generally quite low and comfortable. There are few days during the summer when the humidity becomes unpleasant. The most humid months (but still comfortable) are July, August and June.

July is the wettest month in the 15857 zip code with 4.7 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 30% of yearly precipitation and 20% occurs in Spring, which is the driest season. The annual rainfall of 45.4 inches in the 15857 zip code means that it is wetter than most places in Pennsylvania.

January is the rainiest month in the 15857 zip code with 17.5 days of rain, and August is the driest month with only 11.3 rainy days. There are 166.7 rainy days annually in the 15857 zip code, which is one of the rainiest places in Pennsylvania. The rainiest season is Spring when it rains 29% of the time and the driest is Autumn with only a 22% chance of a rainy day.

An annual snowfall of 68.8 inches in the 15857 zip code means that it is one of the snowiest places in Pennsylvania. January is the snowiest month in the 15857 zip code with 19.2 inches of snow, and 7 months of the year have significant snowfall.

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