TODAY NOV21
TEMPERATURE41
HUMIDITY89
PRESSURE100070
WIND COND.330 9.4
  • 4133Fri70%50%
  • 5038Sat
  • 5232Sun
  • 5643Mon
  • 5633Tue30%
daynightWeather update from Philadelphia - Wings Field Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Norristown for July is 75.8 degrees
  • The lowest monthly average temperature in Norristown for January is 32.9 degrees
  • The most monthly precipitation in Norristown occurs in August with 11 inches
  • The air quality index in Norristown is 21% worse than the national average
  • The pollution index in Norristown is 358% worse than the national average

Compare Norristown, PA Weather

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      Norristown 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
      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"

      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 index514542
      Pollution index12,485,1004,584,8052,726,193

      Norristown air quality

      MeasurementTotal
      Days measured365
      Days with good air quality180
      Days with moderate air quality169
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality0

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Doylestown, PA8,2824118.0%
      Pottsgrove, PA3,2454216.0%
      Royersford, PA4,7604216.0%
      Spring Mount, PA2,4984216.0%
      Gilbertsville, PA5,9794216.0%
      Norristown, PA34,392512.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      University CDP (Orange County), FL34,3794314.0%
      Montgomery Village, MD34,413476.0%
      Georgetown, KY34,3624216.0%
      University City, MO34,336548.0%
      Socorro, TX34,329536.0%
      Norristown, PA34,392512.0%
      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.