TODAY DEC22
TEMPERATURE17
HUMIDITY56
PRESSURE102910
WIND COND.330 11.2
  • 2815Sun
  • 3227Mon
  • 4229Tue30%
  • 4028
  • 4232Thu
daynightWeather update from Wilmington, New Castle County Airport at
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Weather Quick Facts

  • The highest monthly average temperature in New Castle for July is 77.2 degrees
  • The lowest monthly average temperature in New Castle for February is 33.8 degrees
  • The most monthly precipitation in New Castle occurs in October with 6.1 inches
  • The air quality index in New Castle is 21% worse than the national average
  • The pollution index in New Castle is 20% 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 index514142
      Pollution index2,169,6007,274,3072,726,193

      New Castle air quality

      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

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Alloway, NJ1,4744020.0%
      Shiloh, NJ3684020.0%
      Pennsville, NJ11,9684020.0%
      Quinton, NJ3694020.0%
      Woodstown, NJ3,4454020.0%
      New Castle, DE5,302512.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Big Bear Lake, CA5,3028978.0%
      Aberdeen, MS5,3023922.0%
      Yosemite Lakes, CA5,30350= 100
      Moab, UT5,3034412.0%
      Boulder Creek, CA5,3053530.0%
      New Castle, DE5,302512.0%
      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.