TODAY JAN19
TEMPERATURE27
HUMIDITY63
PRESSURE30.3
WIND COND.140 11.2
  • 3921Tue
  • 6027Wed
  • 5223Thu
  • 4324Fri
  • 4922Sat
daynightWeather update from Broomfield / Jeffco at

Key findings

  • The highest monthly average temperature in Derby for July is 73 degrees
  • The lowest monthly average temperature in Derby for December is 30 degrees
  • The most monthly precipitation in Derby occurs in September with 5.7 inches
  • The air quality index in Derby is 17% worse than the national average
  • The pollution index in Derby is 83% better than the national average

Compare Derby, CO 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°F45°F31°F1.8"
      February22°F46°F32°F2.0"
      March30°F58°F42°F2.1"
      April35°F63°F47°F4.0"
      May44°F70°F55°F5.2"
      June54°F84°F68°F4.6"
      July60°F89°F73°F5.7"
      August59°F87°F71°F4.5"
      September51°F79°F63°F5.7"
      October39°F67°F51°F4.1"
      November29°F56°F41°F2.2"
      December19°F44°F30°F2.9"

      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.
      IndexDerbyColoradoNational
      Air quality index583850
      Pollution index872,3092,034,6195,066,862

      Derby air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality91
      Days with moderate air quality252
      Days w/ poor A.Q. for sensitive groups20
      Days with unhealthy air quality2

      Derby air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.010%
      Carbon Tetrachloride0.002%
      Lead0.010%
      Mercury0.000%

      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.
      Leyner, CO27476%
      Broomfield, CO62,449476%
      Lafayette, CO27,053476%
      Paragon Estates, CO892476%
      Superior, CO12,928476%
      Derby, CO8,9305816%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Olney, IL8,9313628%
      Canonsburg, PA8,9335612%
      Makaha, HI8,9343040%
      Madeira, OH8,924548%
      Liberty, TX8,9364510%
      Derby, CO8,9305816%
      Source: The Derby, CO 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.