TODAY NOV25
TEMPERATURE50
HUMIDITY76
PRESSURE100810
WIND COND.150 9.4
  • 5226Mon20%
  • 3830Tue
  • 4327Wed20%40%
  • 3620
  • 2816Fri
daynightWeather update from Morris Muni-James R Washburn Field Airport at
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Weather Quick Facts

  • The highest monthly average temperature in Diamond for July is 73.1 degrees
  • The lowest monthly average temperature in Diamond for January is 24.8 degrees
  • The most monthly precipitation in Diamond occurs in July with 9 inches
  • The air quality index in Diamond is 100% better than the national average
  • The pollution index in Diamond is 36% better than the national average

Compare Diamond, IL Weather

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      Diamond 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
      January18°F33°F25°F3.9"
      February18°F35°F26°F2.3"
      March31°F50°F39°F4.3"
      April40°F63°F50°F8.4"
      May51°F74°F62°F6.0"
      June61°F82°F71°F5.7"
      July63°F84°F73°F9.0"
      August62°F82°F71°F5.4"
      September54°F77°F65°F3.7"
      October44°F65°F53°F7.1"
      November33°F51°F41°F4.0"
      December22°F37°F29°F3.0"

      Diamond 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.
      IndexDiamondIllinoisNational
      Air quality index04142
      Pollution index1,736,9303,148,6942,726,193

      Diamond air quality

      MeasurementTotal
      Days measured335
      Days with good air quality334
      Days with moderate air quality1
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      Air quality details

      PollutantTotal
      Arsenic0.004%
      Benzene0.040%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.001%

      Average monthly Diamond temperature with heat index

      Diamond monthly precipitation with daily maximum

      Diamond monthly snow depth with daily maximum

      Diamond monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Carbon Hill, IL3860100.0%
      Gardner, IL1,4290100.0%
      South Wilmington, IL7020100.0%
      Wilmington, IL5,8830100.0%
      Channahon, IL13,2810100.0%
      Diamond, IL2,7860100.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Snowmass Village, CO2,7864412.0%
      Fairview, PA2,7863628.0%
      Canadian, TX2,7864412.0%
      Bar Nunn, WY2,7864216.0%
      Grand Forks AFB, ND2,7853334.0%
      Diamond, IL2,7860100.0%
      Source: The Diamond, IL 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.