TODAY DEC23
TEMPERATURE13
HUMIDITY64
PRESSURE103560
WIND COND.50 9.4
  • 2924Mon
  • 4024Tue50%
  • 3824
  • 3723Thu
  • 4128Fri
daynightWeather update from Lancaster, Lancaster Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Clay for August is 74.5 degrees
  • The lowest monthly average temperature in Clay for February is 28.4 degrees
  • The most monthly precipitation in Clay occurs in July with 11.6 inches
  • The air quality index in Clay is 7% worse than the national average
  • The pollution index in Clay is 307% worse than the national average

Compare Clay, PA Weather

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      Clay 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°F40°F32°F4.1"
      February19°F38°F28°F2.9"
      March29°F49°F39°F4.6"
      April40°F63°F51°F6.6"
      May47°F74°F61°F2.5"
      June61°F84°F72°F9.0"
      July64°F84°F74°F11.6"
      August65°F84°F74°F4.1"
      September57°F81°F69°F2.3"
      October50°F69°F58°F8.8"
      November34°F55°F44°F3.7"
      December25°F40°F33°F5.2"

      Clay 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.
      IndexClayPennsylvaniaNational
      Air quality index454542
      Pollution index11,091,2004,584,8052,726,193

      Clay air quality

      MeasurementTotal
      Days measured365
      Days with good air quality238
      Days with moderate air quality117
      Days w/ poor A.Q. for sensitive groups9
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.140%
      Carbon Tetrachloride0.030%
      Lead0.310%
      Mercury0.004%

      Average monthly Clay temperature with heat index

      Clay monthly precipitation with daily maximum

      Clay monthly snow depth with daily maximum

      Clay monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Cornwall, PA4,3194216.0%
      Gouglersville, PA4934216.0%
      Penryn, PA1,0584216.0%
      Schaefferstown, PA9074216.0%
      Timber Hills, PA5024216.0%
      Clay, PA1,6654510.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Oakland, IA1,6654020.0%
      Saint-Benoît-Labre, QC1,665n/a 
      Thompson-Nicola M (Beautiful Nicola Valley - North), BC1,665n/a 
      Heritage Lake, IL1,6644412.0%
      Milford, IN1,6643726.0%
      Clay, PA1,6654510.0%
      Source: The Clay, 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.