TODAY MAR02
TEMPERATURE39
HUMIDITY30
PRESSURE30.23
WIND COND.280 22.3
  • 5433Wed
  • 4628Thu
  • 4228Fri
  • 4428Sat
  • 4429Sun
daynightWeather update from Wilmington, New Castle County Airport at

Key findings

  • The highest monthly average temperature in New Castle for July is 77 degrees
  • The lowest monthly average temperature in New Castle for February is 34 degrees
  • The most monthly precipitation in New Castle occurs in October with 6.1 inches
  • The air quality index in New Castle is 3% worse than the national average
  • The pollution index in New Castle is 57% better than the national average

Compare New Castle, DE Weather

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      New Castle 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
      January27°F43°F34°F3.3"
      February26°F43°F34°F2.5"
      March34°F54°F43°F3.7"
      April44°F66°F54°F4.9"
      May52°F74°F63°F3.2"
      June64°F83°F73°F5.0"
      July68°F87°F77°F5.6"
      August67°F86°F76°F3.7"
      September59°F79°F69°F4.1"
      October48°F67°F57°F6.1"
      November40°F57°F48°F3.3"
      December30°F46°F38°F5.3"

      New Castle 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.
      IndexNew CastleDelawareNational
      Air quality index514150
      Pollution index2,169,6003,759,2125,066,862

      New Castle air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality180
      Days with moderate air quality169
      Days w/ poor A.Q. for sensitive groups16
      Days with unhealthy air quality0

      New Castle air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.030%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.004%

      Average monthly New Castle temperature with heat index

      New Castle monthly precipitation with daily maximum

      New Castle monthly snow depth with daily maximum

      New Castle monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Pennsville, NJ11,4214020%
      Quinton, NJ5494020%
      Woodstown, NJ3,5484020%
      Salem, NJ4,9314020%
      Alloway, NJ1,4574020%
      New Castle, DE5,372512%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Fairport, NY5,3723726%
      Northfield, IL5,3745510%
      Berryville, AR5,3701864%
      Post, TX5,3692550%
      Bright, IN5,375548%
      New Castle, DE5,372512%
      Source: The New Castle, DE 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.