TODAY APR16
TEMPERATURE44
HUMIDITY70
PRESSURE102000
WIND COND.260 5.4
  • 7148
  • 6148Wed30%90%
  • 5344Thu80%40%
  • 6248Fri50%
  • 6542Sat40%
daynightWeather update from Allentown, Lehigh Valley International Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Bethlehem for July is 75.4 degrees
  • The lowest monthly average temperature in Bethlehem for January is 29.9 degrees
  • The most monthly precipitation in Bethlehem occurs in July with 6.4 inches
  • The air quality index in Bethlehem is equal to the national average
  • The pollution index in Bethlehem is 16% worse than the national average

Compare Bethlehem, PA Weather

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      Bethlehem 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°F40°F30°F3.5"
      February20°F42°F31°F3.1"
      March28°F53°F40°F3.4"
      April38°F67°F52°F3.9"
      May48°F76°F62°F3.7"
      June58°F84°F71°F5.5"
      July63°F88°F75°F6.4"
      August61°F85°F73°F5.0"
      September54°F80°F66°F4.5"
      October43°F68°F55°F5.4"
      November33°F56°F44°F2.8"
      December26°F45°F35°F4.9"

      Bethlehem 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.
      IndexBethlehemPennsylvaniaNational
      Air quality index424542
      Pollution index3,167,1104,584,8052,726,193

      Bethlehem air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality275
      Days with moderate air quality86
      Days w/ poor A.Q. for sensitive groups4
      Days with unhealthy air quality0

      Bethlehem air quality information

      PollutantTotal
      Arsenic0.002%
      Benzene0.040%
      Carbon Tetrachloride0.010%
      Lead0.030%
      Mercury0.001%

      Average monthly Bethlehem temperature with heat index

      Bethlehem monthly precipitation with daily maximum

      Bethlehem monthly snow depth with daily maximum

      Bethlehem monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Hutchinson, NJ1223432.0%
      Martins Creek, PA4573432.0%
      Ackermanville, PA3983432.0%
      Belfast, PA1,3053432.0%
      Harmony, NJ4103432.0%
      Bethlehem, PA75,5714216.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Carmichael, CA75,642524.0%
      Gary, IN75,4865510.0%
      Baldwin Park, CA75,6597244.0%
      Georgetown, TX75,4704412.0%
      St. Joseph, MO75,3694314.0%
      Bethlehem, PA75,5714216.0%
      Source: The Bethlehem, 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.