St. Marys, PA Weather - Forecast & Monthly Averages

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Weather Quick Facts

The highest monthly average temperature in St. Marys for July is 69.8 degrees
The lowest monthly average temperature in St. Marys for January is 25.1 degrees
The most monthly precipitation in St. Marys occurs in June with 5.4 inches
The air quality index in St. Marys is 17% better than the national average
The pollution index in St. Marys is 5% worse than the national average

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St. Marys Average Temperature

In the event that the weather data was unavailable for this city, estimates based upon nearby cities were used.
Month	Temp. _(min)	Temp. _(max)	Temp. _(avg)	Precipitation
January	18°F	33°F	25°F	2.8"
February	18°F	34°F	25°F	2.2"
March	27°F	46°F	35°F	3.3"
April	38°F	61°F	48°F	3.6"
May	47°F	70°F	58°F	4.0"
June	56°F	77°F	66°F	5.4"
July	59°F	81°F	70°F	4.1"
August	58°F	79°F	68°F	4.3"
September	52°F	73°F	62°F	3.5"
October	42°F	61°F	51°F	4.2"
November	32°F	50°F	40°F	3.2"
December	24°F	38°F	30°F	3.6"

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St. Marys 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.
Index	St. Marys	Pennsylvania	National
Air quality index	35	45	42
Pollution index	2,854,150	4,584,805	2,726,193

St. Marys air quality

Measurement	Total
Days measured	357
Days with good air quality	345
Days with moderate air quality	12
Days w/ poor A.Q. for sensitive groups	0
Days with unhealthy air quality	0

Air quality details

Pollutant	Total
Arsenic	0.010%
Benzene	0.030%
Carbon Tetrachloride	0.002%
Lead	0.010%
Mercury	0.010%

Average monthly St. Marys temperature with heat index

St. Marys monthly precipitation with daily maximum

St. Marys monthly snow depth with daily maximum

St. Marys monthly wind speed information

Nearby cities with good air quality

City	Population	Air Quality Index	National Avg.
Brockway, PA	2,042	33	34.0%
Crenshaw, PA	320	33	34.0%
James City, PA	250	35	30.0%
Kersey, PA	1,022	35	30.0%
Ridgway, PA	3,781	35	30.0%
St. Marys, PA	12,333	35	30.0%

Cities with similar population

City	Population	Air Quality Index	National Avg.
New Baltimore, MI	12,333	56	12.0%
Gulfport, FL	12,334	38	24.0%
Tamalpais-Homestead Valley, CA	12,331	40	20.0%
Streator, IL	12,337	0	100.0%
Lincolnwood, IL	12,338	55	10.0%
St. Marys, PA	12,333	35	30.0%

Source: The St. Marys, 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.