TODAY NOV21
TEMPERATURE33
HUMIDITY96
PRESSURE100480
WIND COND.
  • 4131Fri90%40%
  • 4937Sat20%
  • 4933Sun
  • 5140Mon30%
  • 5232Tue
daynightWeather update from Selinsgrove Penn Valley Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Herndon for July is 73.8 degrees
  • The lowest monthly average temperature in Herndon for January is 29.1 degrees
  • The most monthly precipitation in Herndon occurs in July with 4.7 inches
  • The air quality index in Herndon is 5% worse than the national average
  • The pollution index in Herndon is 33% worse than the national average

Compare Herndon, PA Weather

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      Herndon 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
      January20°F38°F29°F2.4"
      February20°F40°F30°F1.9"
      March29°F51°F39°F2.6"
      April39°F65°F52°F3.4"
      May49°F75°F61°F3.8"
      June59°F83°F71°F3.9"
      July62°F86°F74°F4.7"
      August60°F84°F71°F4.2"
      September53°F78°F64°F4.4"
      October43°F66°F53°F4.5"
      November32°F54°F42°F3.0"
      December26°F43°F34°F3.2"

      Herndon 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.
      IndexHerndonPennsylvaniaNational
      Air quality index444542
      Pollution index3,637,0204,584,8052,726,193

      Herndon air quality

      MeasurementTotal
      Days measured365
      Days with good air quality252
      Days with moderate air quality107
      Days w/ poor A.Q. for sensitive groups5
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.020%
      Benzene0.030%
      Carbon Tetrachloride0.004%
      Lead0.010%
      Mercury0.002%

      Average monthly Herndon temperature with heat index

      Herndon monthly precipitation with daily maximum

      Herndon monthly snow depth with daily maximum

      Herndon monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Middleburg, PA1,6153530.0%
      Shamokin Dam, PA1,8123530.0%
      Paxtonville, PA3143530.0%
      Snydertown, PA4593530.0%
      Winfield, PA8723530.0%
      Herndon, PA3744412.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Potter Valley, CA3743334.0%
      Mondamin, IA3744020.0%
      Eden, ID3742060.0%
      Marshall, IN3744510.0%
      Sylvan Grove, KS3743236.0%
      Herndon, PA3744412.0%
      Source: The Herndon, 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.