TODAY MAR29
TEMPERATURE54
HUMIDITY49
PRESSURE101320
WIND COND.330 25.9
  • 6551Sat20%40%
  • 7050Sun50%
  • 6250Mon70%80%
  • 6850Tue80%70%
  • 5940Wed70%50%
daynightWeather update from Washington/Reagan National Airport, DC at
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Weather Quick Facts

  • The highest monthly average temperature in Capitol Hill for July is 80.8 degrees
  • The lowest monthly average temperature in Capitol Hill for January is 37.1 degrees
  • The most monthly precipitation in Capitol Hill occurs in June with 5.3 inches
  • The air quality index in Capitol Hill is 12% worse than the national average
  • The pollution index in Capitol Hill is 104% worse than the national average

Compare Washington, DC Weather

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      Capitol Hill 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
      January28°F47°F37°F2.7"
      February29°F50°F38°F2.3"
      March37°F60°F47°F3.2"
      April47°F71°F58°F3.4"
      May56°F78°F67°F4.6"
      June67°F87°F77°F5.3"
      July72°F91°F81°F4.2"
      August70°F90°F79°F3.2"
      September63°F83°F72°F3.5"
      October52°F72°F61°F5.0"
      November40°F61°F50°F2.5"
      December33°F52°F42°F3.8"

      Capitol Hill 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.
      IndexCapitol HillWashingtonDistrict of Columbia
      Air quality index474749
      Pollution index5,554,0105,554,0105,554,010

      Capitol Hill air quality information

      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

      Capitol Hill air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.060%
      Carbon Tetrachloride0.010%
      Lead0.004%
      Mercury0.010%

      Average monthly Capitol Hill temperature with heat index

      Capitol Hill monthly precipitation with daily maximum

      Capitol Hill monthly snow depth with daily maximum

      Capitol Hill monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Maryland City, MD17,681468.0%
      Bailey's Crossroads, VA23,459476.0%
      Hayfield, VA4,535476.0%
      Lake Barcroft, VA10,604476.0%
      Pimmit Hills, VA6,064476.0%
      Washington, DC701,974476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Vancouver, BC694,440n/a 
      Boston, MA689,3264314.0%
      Denver, CO715,8785816.0%
      El Paso, TX679,879536.0%
      Detroit, MI672,3515612.0%
      Washington, DC701,974476.0%
      Source: The Capitol Hill, Washington, DC 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.