TODAY NOV15
TEMPERATURE
HUMIDITY49
PRESSURE30.45
WIND COND.70 10.3
  • 4232Fri60%
  • 4530Sat
  • 4231Sun30%
  • 4426Mon30%
  • 3924Tue
daynightWeather update from Allentown, Lehigh Valley International Airport at

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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"

Did you know?

  • The highest monthly average temperature in Bethlehem for July is 75 degrees.
  • The lowest monthly average temperature in Bethlehem for January is 30 degrees.
  • The most monthly precipitation in Bethlehem occurs in July with 6.4 inches.
  • The air quality index in Bethlehem is 5% better than the national average.
  • The pollution index in Bethlehem is 37% better than the national average.

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Compare Bethlehem, PA Weather To Other Cities

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 index474550
Pollution index3,167,1104,327,9925,066,862

Bethlehem air quality information

MeasurementTotal
Days measured365
Days with good air quality203
Days with moderate air quality151
Days w/ poor A.Q. for sensitive groups11
Days with unhealthy air quality

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

City, StatePopulationAir Quality IndexNational Avg.
Brainards, NJ2213922%
Ackermanville, PA9903922%
Harmony, NJ3743922%
Belfast, PA1,0103922%
Martins Creek, PA5163922%
Bethlehem, PA75,110476%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Plymouth, MN75,1054412%
Pharr, TX75,1723628%
Lake Charles, LA75,0444216%
Folsom, CA74,9605510%
Baytown, TX75,310524%
Bethlehem, PA75,110476%
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.