TODAY DEC28
TEMPERATURE43
HUMIDITY93
PRESSURE102240
WIND COND.160 13
  • 544540%20%
  • 6146Sun70%90%
  • 5336Mon50%
  • 5139Tue70%
  • 442930%30%
daynightWeather update from Hagerstown, Washington County Regional Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Mercersburg for July is 77.1 degrees
  • The lowest monthly average temperature in Mercersburg for January is 32.3 degrees
  • The most monthly precipitation in Mercersburg occurs in June with 4 inches
  • The air quality index in Mercersburg is 14% better than the national average
  • The pollution index in Mercersburg is 495% worse than the national average

Compare Mercersburg, PA Weather

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      Mercersburg 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
      January25°F41°F32°F2.2"
      February25°F43°F34°F1.8"
      March34°F55°F44°F2.3"
      April44°F67°F55°F3.3"
      May54°F76°F64°F3.9"
      June63°F84°F73°F4.0"
      July67°F88°F77°F3.3"
      August65°F85°F75°F2.8"
      September58°F79°F68°F3.2"
      October48°F67°F57°F3.6"
      November37°F55°F45°F2.1"
      December30°F46°F37°F3.0"

      Mercersburg 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.
      IndexMercersburgPennsylvaniaNational
      Air quality index364542
      Pollution index16,230,7004,584,8052,726,193

      Mercersburg air quality

      MeasurementTotal
      Days measured341
      Days with good air quality324
      Days with moderate air quality17
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.130%
      Carbon Tetrachloride0.090%
      Lead0.080%
      Mercury0.020%

      Average monthly Mercersburg temperature with heat index

      Mercersburg monthly precipitation with daily maximum

      Mercersburg monthly snow depth with daily maximum

      Mercersburg monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Chambersburg, PA21,0173628.0%
      Marion, PA1,5513628.0%
      Fort Loudon, PA1,1683628.0%
      Needmore, PA923628.0%
      McConnellsburg, PA1,0303628.0%
      Mercersburg, PA1,6733628.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Cheswold, DE1,6734216.0%
      Plainville, KS1,6731570.0%
      Evart, MI1,6733628.0%
      Chepachet, RI1,6734412.0%
      Holliday, TX1,6732648.0%
      Mercersburg, PA1,6733628.0%
      Source: The Mercersburg, 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.