TODAY NOV23
TEMPERATURE40
HUMIDITY67
PRESSURE100070
WIND COND.280 5.4
  • 5038Sat
  • 5132Sun
  • 5542Mon50%
  • 5530Tue80%
  • 4628Wed
daynightWeather update from Muir Army Air Field / Indiantown at
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Weather Quick Facts

  • The highest monthly average temperature in Williamstown for July is 74.9 degrees
  • The lowest monthly average temperature in Williamstown for January is 29.6 degrees
  • The most monthly precipitation in Williamstown occurs in September with 10.8 inches
  • The air quality index in Williamstown is equal to the national average
  • The pollution index in Williamstown is 33% worse than the national average

Compare Williamstown, PA Weather

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      Williamstown 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
      January22°F38°F30°F5.3"
      February22°F41°F31°F4.5"
      March31°F52°F41°F6.9"
      April41°F65°F53°F6.5"
      May51°F74°F62°F7.6"
      June60°F82°F71°F8.8"
      July64°F87°F75°F7.6"
      August62°F83°F72°F8.9"
      September55°F77°F66°F10.8"
      October44°F66°F55°F8.6"
      November34°F54°F44°F6.0"
      December28°F43°F35°F6.6"

      Williamstown 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.
      IndexWilliamstownPennsylvaniaNational
      Air quality index424542
      Pollution index3,637,0204,584,8052,726,193

      Williamstown air quality

      MeasurementTotal
      Days measured360
      Days with good air quality278
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Air quality details

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

      Average monthly Williamstown temperature with heat index

      Williamstown monthly precipitation with daily maximum

      Williamstown monthly snow depth with daily maximum

      Williamstown monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Tower City, PA1,1874216.0%
      Gordon, PA9694216.0%
      Mount Carmel, PA5,6724216.0%
      Ravine, PA6704216.0%
      Gratz, PA7634216.0%
      Williamstown, PA1,1724216.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Jennerstown, PA1,1723628.0%
      Saegertown, PA1,1723628.0%
      Buchanan, VA1,1723824.0%
      Challenge-Brownsville, CA1,1714412.0%
      Silverado Resort, CA1,1713530.0%
      Williamstown, PA1,1724216.0%
      Source: The Williamstown, 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.