TODAY NOV10
TEMPERATURE42
HUMIDITY49
PRESSURE102710
WIND COND.140 11.2
  • 5345Sun50%100%
  • 634050%
  • 5227Tue
  • 5234Wed
  • 5437Thu40%40%
daynightWeather update from Altoona - Blair County Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Defiance for July is 71.8 degrees
  • The lowest monthly average temperature in Defiance for January is 28.1 degrees
  • The most monthly precipitation in Defiance occurs in May with 4.2 inches
  • The air quality index in Defiance is 3% better than the national average
  • The pollution index in Defiance is 39% better than the national average

Compare Defiance, PA Weather

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      Defiance 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
      January21°F37°F28°F2.0"
      February21°F38°F29°F1.6"
      March29°F49°F39°F2.9"
      April40°F63°F51°F3.1"
      May49°F72°F60°F4.2"
      June58°F79°F68°F4.2"
      July61°F83°F72°F4.1"
      August59°F81°F69°F3.6"
      September53°F75°F63°F3.3"
      October44°F64°F53°F3.6"
      November33°F52°F42°F2.2"
      December26°F41°F33°F3.1"

      Defiance 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.
      IndexDefiancePennsylvaniaNational
      Air quality index414542
      Pollution index1,656,4604,584,8052,726,193

      Defiance air quality

      MeasurementTotal
      Days measured354
      Days with good air quality281
      Days with moderate air quality73
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.005%
      Benzene0.030%
      Carbon Tetrachloride0.002%
      Lead0.004%
      Mercury0.000%

      Average monthly Defiance temperature with heat index

      Defiance monthly precipitation with daily maximum

      Defiance monthly snow depth with daily maximum

      Defiance monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Valley-Hi, PA23628.0%
      Bedford, PA2,7033628.0%
      Saltillo, PA3553628.0%
      Three Springs, PA5923628.0%
      St. Clairsville, PA673922.0%
      Defiance, PA4814118.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Pleasant Groves, AL4814412.0%
      Newell, CA4812942.0%
      Manilla, IN4812844.0%
      Kensington, KS4811962.0%
      Scandia, KS4813236.0%
      Defiance, PA4814118.0%
      Source: The Defiance, 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.