TODAY AUG20
TEMPERATURE70
HUMIDITY78
PRESSURE30.15
WIND COND.60 4.7
  • 8271Tue30%80%
  • 8461Wed50%20%
  • 7960Thu
  • 8262Fri
  • 8365Sat
daynightWeather update from Philadelphia - Wings Field Airport at

Norristown 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
January26°F41°F33°F3.2"
February26°F42°F33°F2.5"
March34°F53°F42°F6.9"
April43°F65°F53°F3.6"
May52°F74°F63°F6.0"
June61°F81°F71°F6.5"
July66°F86°F76°F7.9"
August63°F83°F73°F11.0"
September56°F77°F66°F6.8"
October46°F66°F55°F9.4"
November37°F55°F45°F2.9"
December31°F46°F38°F7.7"

Did you know?

  • The highest monthly average temperature in Norristown for July is 76 degrees.
  • The lowest monthly average temperature in Norristown for January is 33 degrees.
  • The most monthly precipitation in Norristown occurs in August with 11 inches.
  • The air quality index in Norristown is 14% worse than the national average.
  • The pollution index in Norristown is 146% worse than the national average.

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Compare Norristown, PA Weather To Other Cities

Norristown 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.
IndexNorristownPennsylvaniaNational
Air quality index574550
Pollution index12,485,1004,327,9925,066,862

Norristown air quality information

MeasurementTotal
Days measured365
Days with good air quality110
Days with moderate air quality244
Days w/ poor A.Q. for sensitive groups11
Days with unhealthy air quality

Norristown air quality information

PollutantTotal
Arsenic0.020%
Benzene0.100%
Carbon Tetrachloride0.100%
Lead0.120%
Mercury0.010%

Average monthly Norristown temperature with heat index

Norristown monthly precipitation with daily maximum

Norristown monthly snow depth with daily maximum

Norristown monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Doylestown, PA8,3054020%
Royersford, PA4,7824510%
Greenfields, PA9364510%
Sanatoga, PA8,5344510%
Pottsgrove, PA3,3324510%
Norristown, PA34,4605714%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
La Vergne, TN34,4514510%
Four Corners, FL34,4483628%
Winter Springs, FL34,4393530%
Glendale Heights, IL34,3956020%
Pleasant Hill, CA34,3954314%
Norristown, PA34,4605714%
Source: The Norristown, 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.