TODAY FEB25
TEMPERATURE43
HUMIDITY79
PRESSURE29.71
WIND COND.250 13
  • 4523Thu
  • 4229Fri
  • 4736Sat50%30%
  • 5037Sun40%
  • 4625Mon
daynightWeather update from Oxford, Waterbury-Oxford Airport at

Key findings

  • The highest monthly average temperature in Derby for August is 71 degrees
  • The lowest monthly average temperature in Derby for February is 26 degrees
  • The most monthly precipitation in Derby occurs in April with 15 inches
  • The air quality index in Derby is 18% better than the national average
  • The pollution index in Derby is 186% worse than the national average

Compare Derby, CT Weather

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      Derby 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
      January21°F37°F28°F5.0"
      February19°F35°F26°F9.8"
      March25°F44°F34°F6.0"
      April38°F59°F47°F15.0"
      May46°F68°F56°F14.6"
      June58°F78°F67°F11.3"
      July62°F81°F70°F12.6"
      August62°F82°F71°F8.3"
      September55°F76°F65°F2.3"
      October48°F64°F54°F12.4"
      November34°F51°F41°F5.2"
      December23°F36°F29°F5.5"

      Derby 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.
      IndexDerbyConnecticutNational
      Air quality index414350
      Pollution index14,500,3007,127,5315,066,862

      Derby air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality280
      Days with moderate air quality71
      Days w/ poor A.Q. for sensitive groups12
      Days with unhealthy air quality2

      Derby air quality information

      PollutantTotal
      Arsenic0.030%
      Benzene0.140%
      Carbon Tetrachloride0.050%
      Lead0.080%
      Mercury0.060%

      Average monthly Derby temperature with heat index

      Derby monthly precipitation with daily maximum

      Derby monthly snow depth with daily maximum

      Derby monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Cheshire Village, CT6,1034118%
      West Haven, CT54,9724118%
      Ansonia, CT18,9504118%
      Heritage Village, CT3,8754118%
      North Haven, CT23,8884118%
      Derby, CT12,7554118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Kewanee, IL12,7554118%
      Auburn, IN12,7584510%
      St. Marys, PA12,7483530%
      Parker, SC12,743468%
      Short Hills, NJ12,771512%
      Derby, CT12,7554118%
      Source: The Derby, CT 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.