TODAY MAY17
TEMPERATURE52
HUMIDITY94
PRESSURE30.06
WIND COND.
  • 6647Tue50%20%
  • 7250Wed
  • 8052Thu
  • 7551Fri
  • 7551Sat
daynightWeather update from Broomfield / Jeffco at

Key findings

  • The highest monthly average temperature in Welby for July is 73.1 degrees
  • The lowest monthly average temperature in Welby for December is 29.8 degrees
  • The most monthly precipitation in Welby occurs in September with 5.7 inches
  • The air quality index in Welby is 17% worse than the national average
  • The pollution index in Welby is 100% better than the national average

Compare Welby, CO Weather

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      Welby 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"

      Welby 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.
      IndexWelbyColoradoNational
      Air quality index583850
      Pollution index24,0402,034,6195,066,862

      Welby 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

      Welby air quality information

      PollutantTotal
      Arsenic0.000%
      Benzene0.000%
      Carbon Tetrachloride0.000%
      Lead0.000%
      Mercury0.000%

      Average monthly Welby temperature with heat index

      Welby monthly precipitation with daily maximum

      Welby monthly snow depth with daily maximum

      Welby monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Louisville, CO19,972476%
      Superior, CO12,928476%
      Erie, CO20,801476%
      Lafayette, CO27,053476%
      Paragon Estates, CO892476%
      Welby, CO16,7715816%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Mount Vernon, OH16,7774118%
      Douglas, AZ16,7644510%
      Fayetteville, GA16,780524%
      Lemay, MO16,762548%
      Laurel, VA16,7564412%
      Welby, CO16,7715816%
      Source: The Welby, 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.