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Marietta Average Weather

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
MonthTemp. (min)Temp. (max)Temp. (avg)Precipitation
January0°F70°F32°F2.3"
February5°F66°F31°F1.6"
March7°F79°F40°F1.6"
April24°F88°F52°F3.4"
May32°F91°F60°F2.5"
June45°F93°F71°F6.1"
July51°F93°F74°F5.0"
August50°F97°F73°F2.5"
September41°F91°F66°F3.0"
October28°F90°F55°F3.7"
November19°F73°F45°F1.9"
December3°F72°F35°F2.7"

Did you know?

  • The highest monthly average temperature in Marietta for July is 74 degrees.
  • The lowest monthly average temperature in Marietta for February is 31 degrees.
  • The most monthly precipitation in Marietta occurs in June with 6.1 inches.
  • The air quality index in Marietta is 9% better than the national average.
  • The pollution index in Marietta is 118% worse than the national average.

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Compare Marietta, PA Weather To Other Cities

Marietta air quality index & pollution index

In the event that the air quality/pollution data was unavailable for this city, estimates based upon nearby cities were used.
IndexMariettaPennsylvaniaNational
Air quality index454550
Pollution index11,091,2004,327,9925,066,862

Marietta air quality information

MeasurementTotal
Days measured365
Days with good air quality241
Days with moderate air quality119
Days w/ poor A.Q. for sensitive groups5
Days with unhealthy air quality

Marietta air quality information

PollutantTotal
Arsenic0.010%
Benzene0.140%
Carbon Tetrachloride0.030%
Lead0.310%
Mercury0.004%

Average monthly Marietta temperature with heat index

Marietta monthly precipitation with daily maximum

Marietta monthly snow depth with daily maximum

Marietta monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Cornwall, PA4,2324314%
Mount Gretna, PA2404314%
Brickerville, PA1,4504314%
Mount Gretna Heights, PA3044314%
Penryn, PA9634314%
Marietta, PA2,6014510%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Portage, PA2,6014510%
Chewelah, WA2,6013922%
Alamo, TN2,601335570%
Blountville, TN2,6024510%
Hawaiian Acres, HI2,603142184%
Marietta, PA2,6014510%
Source: The Marietta, PA weather data displayed above is derived from the NOAA (National Oceanic and Atmospheric). Air quality and pollution data is derived from the EPA (United States Environmental Protection Agency). Air quality and pollution levels measured in a particular area may not be representative of the entire county.