TODAY JAN21
TEMPERATURE8
HUMIDITY57
PRESSURE30
WIND COND.
  • 134
  • 2621Tue
  • 4035Wed90%90%
  • 4123Thu90%70%
  • 308Fri30%
daynightWeather update from Reading, Reading Regional Airport at

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St. Clair Average Temperature

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
January23°F40°F31°F2.6"
February23°F42°F32°F2.4"
March31°F53°F41°F3.1"
April42°F66°F54°F3.6"
May51°F75°F63°F3.7"
June61°F84°F72°F4.8"
July66°F88°F77°F5.0"
August64°F85°F74°F4.7"
September57°F79°F68°F4.4"
October46°F67°F56°F4.8"
November35°F55°F45°F2.7"
December29°F45°F36°F3.8"

Did you know?

  • The highest monthly average temperature in St. Clair for July is 77 degrees.
  • The lowest monthly average temperature in St. Clair for January is 31 degrees.
  • The most monthly precipitation in St. Clair occurs in July with 5 inches.
  • The air quality index in St. Clair is 13% better than the national average.
  • The pollution index in St. Clair is 74% better than the national average.

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Compare St. Clair, PA Weather To Other Cities

St. Clair 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.
IndexSt. ClairPennsylvaniaNational
Air quality index434550
Pollution index1,279,5304,327,9925,066,862

St. Clair air quality information

MeasurementTotal
Days measured365
Days with good air quality236
Days with moderate air quality120
Days w/ poor A.Q. for sensitive groups9
Days with unhealthy air quality

St. Clair air quality information

PollutantTotal
Arsenic0.001%
Benzene0.020%
Carbon Tetrachloride0.002%
Lead0.002%
Mercury0.000%

Average monthly St. Clair temperature with heat index

St. Clair monthly precipitation with daily maximum

St. Clair monthly snow depth with daily maximum

St. Clair monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Nuremberg, PA3724020%
Altamont, PA7014314%
Englewood, PA6024314%
Friedensburg, PA8834314%
Lavelle, PA4974314%
St. Clair, PA2,9274314%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Clarence, NY2,9274118%
Marengo, IA2,9274216%
Acres Green, CO2,926548%
Roosevelt Gardens, FL2,9284118%
Hildale, UT2,9264118%
St. Clair, PA2,9274314%
Source: The St. Clair, 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.
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