TODAY NOV22
TEMPERATURE42
HUMIDITY67
PRESSURE100370
WIND COND.280 18.4
  • 4135Fri60%40%
  • 5139Sat
  • 5334Sun
  • 5845Mon
  • 5535Tue30%
daynightWeather update from Washington/Reagan National Airport, DC at
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Weather Quick Facts

  • The highest monthly average temperature in Olney for July is 75.6 degrees
  • The lowest monthly average temperature in Olney for January is 31.4 degrees
  • The most monthly precipitation in Olney occurs in October with 9.4 inches
  • The air quality index in Olney is 12% worse than the national average
  • The pollution index in Olney is 455% worse than the national average

Compare Olney, MD Weather

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      Olney 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
      January24°F41°F31°F4.1"
      February26°F44°F34°F5.6"
      March34°F55°F43°F6.4"
      April44°F68°F55°F6.1"
      May55°F76°F64°F9.2"
      June63°F84°F72°F6.0"
      July66°F87°F76°F5.5"
      August64°F85°F73°F7.7"
      September58°F79°F67°F7.6"
      October46°F67°F55°F9.4"
      November36°F55°F44°F5.4"
      December30°F46°F37°F6.8"

      Olney 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.
      IndexOlneyMarylandNational
      Air quality index474342
      Pollution index15,133,0005,342,3672,726,193

      Olney air quality

      MeasurementTotal
      Days measured365
      Days with good air quality209
      Days with moderate air quality145
      Days w/ poor A.Q. for sensitive groups10
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.070%
      Benzene0.130%
      Carbon Tetrachloride0.060%
      Lead0.070%
      Mercury0.130%

      Average monthly Olney temperature with heat index

      Olney monthly precipitation with daily maximum

      Olney monthly snow depth with daily maximum

      Olney monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Monrovia, MD1,5564020.0%
      Urbana, MD12,3624020.0%
      Columbia, MD105,412468.0%
      Maryland City, MD17,681468.0%
      North Laurel, MD24,856468.0%
      Olney, MD35,350476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Moose Jaw, SK35,355n/a 
      La Porte, TX35,340524.0%
      Carrollwood, FL35,3604314.0%
      Monroe, NC35,339492.0%
      Lufkin, TX35,3363628.0%
      Olney, MD35,350476.0%
      Source: The Olney, MD 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.