TODAY AUG18
TEMPERATURE70
HUMIDITY100
PRESSURE
WIND COND.200 8.1
  • 776360%50%
  • 7963Sun
  • 8067Mon50%
  • 7964Tue70%60%
  • 7355Wed30%
daynightWeather update from Latrobe / Westmorland at

Derry Average Weather

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
January24°F38°F31°F4.7"
February23°F39°F31°F4.1"
March33°F51°F42°F6.1"
April42°F63°F54°F4.9"
May52°F72°F63°F6.5"
June60°F78°F70°F7.0"
July64°F82°F74°F9.5"
August62°F80°F72°F7.4"
September56°F74°F66°F6.3"
October45°F63°F55°F5.9"
November35°F52°F44°F5.6"
December29°F43°F36°F6.4"

Did you know?

  • The highest monthly average temperature in Derry for July is 74 degrees.
  • The lowest monthly average temperature in Derry for January is 31 degrees.
  • The most monthly precipitation in Derry occurs in July with 9.5 inches.
  • The air quality index in Derry is 9% better than the national average.
  • The pollution index in Derry is 43% worse than the national average.

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Compare Derry, PA Weather To Other Cities

Derry 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.
IndexDerryPennsylvaniaNational
Air quality index454550
Pollution index7,262,6904,327,9925,066,862

Derry air quality information

MeasurementTotal
Days measured365
Days with good air quality219
Days with moderate air quality144
Days w/ poor A.Q. for sensitive groups2
Days with unhealthy air quality

Derry air quality information

PollutantTotal
Arsenic0.030%
Benzene0.090%
Carbon Tetrachloride0.260%
Lead0.140%
Mercury0.030%

Average monthly Derry temperature with heat index

Derry monthly precipitation with daily maximum

Derry monthly snow depth with daily maximum

Derry monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bear Rocks, PA9593236%
Boswell, PA1,2713236%
Laurel Mountain, PA2023236%
Mammoth, PA4823236%
Hostetter, PA8493236%
Derry, PA2,6144510%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
New London, OH2,6143432%
Rhinebeck, NY2,6143628%
Leadville, CO2,6144216%
Thornton, IL2,6146020%
Owings, MD2,615492%
Derry, PA2,6144510%
Source: The Derry, 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.