Marietta, PA Climate


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United States / Pennsylvania / Lancaster Metro Area / Lancaster County / Marietta / Zip Codes
Marietta, PA features a humid continental climate that is characterized by warm and humid summers and cold, snowy winters. The average high during the summer months of July and August is around 82°F (27.8°C), while the average winter temperature dips down to around 26°F (-3.3°C). Precipitation is fairly consistent throughout the year, with average annual rainfall totaling 40 inches (101 cm) and snowfall totaling around 33 inches (83 cm).

Marietta, Pennsylvania gets 42 inches of rain, on average, per year. The US average is 38 inches of rain per year.

Marietta averages 24 inches of snow per year. The US average is 28 inches of snow per year.

On average, there are 196 sunny days per year in Marietta. The US average is 205 sunny days.

Marietta gets some kind of precipitation, on average, 121 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 22
Rain: averages 42 inches of rain a year
Snow: averages 24 inches of snow a year

Bestplaces Comfort Index

The annual BestPlaces Comfort Index for Marietta is 7.2 (10=best), which means it is one of the most pleasant places in Pennsylvania.

8.7 Summer - 5.4 Winter
June, September and May are the most pleasant months in Marietta, while January and February are the least comfortable months.

  ClimateMarietta, PennsylvaniaUnited States
  41.8 in.38.1 in.
  23.8 in.27.8 in.
  120.5 days106.2 days
  196 days205 days
  85.6°85.8°
  21.9°21.7°
  7.27
  3.84.3
  276 ft.2443 ft.
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 Marietta with an average high temperature of 85.6°, which ranks it as one of the hottest places in Pennsylvania. In Marietta, there are 4 comfortable months with high temperatures in the range of 70-85°. The most pleasant months of the year for Marietta are September, June and May.
In Marietta, there are 15.7 days annually when the high temperature is over 90°, which is hotter than most places in Pennsylvania.
January has the coldest nighttime temperatures for Marietta with an average of 21.9°. This is one of the warmest places in Pennsylvania.
In Marietta, there are 109.3 days annually when the nighttime low temperature falls below freezing, which is warmer than most places in Pennsylvania.
In Marietta, there are 1.2 days annually when the nighttime low temperature falls below zero°, which is warmer than most places in Pennsylvania.
The humidity is usually comfortable in Marietta 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 Marietta with 4.5 inches of rain, and the driest month is February with 2.5 inches. The wettest season is Autumn with 28% of yearly precipitation and 21% occurs in Spring, which is the driest season. The annual rainfall of 41.8 inches in Marietta means that it is drier than most places in Pennsylvania.
May is the rainiest month in Marietta with 12.3 days of rain, and October is the driest month with only 8.8 rainy days. There are 120.5 rainy days annually in Marietta, 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 23.8 inches in Marietta means that it is less snowy than most places in Pennsylvania. February is the snowiest month in Marietta with 8.3 inches of snow, and 5 months of the year have significant snowfall.
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