TODAY MAY05
TEMPERATURE64
HUMIDITY35
PRESSURE30.12
WIND COND.330 13
  • 6141Thu50%
  • 6340Fri
  • 6244Sat60%
  • 5739Sun60%30%
  • 6140Mon
daynightWeather update from Peoria - General Downing-Peoria International Airport at

Key findings

  • The highest monthly average temperature in Washington for July is 76.3 degrees
  • The lowest monthly average temperature in Washington for January is 25.9 degrees
  • The most monthly precipitation in Washington occurs in June with 5.4 inches
  • The air quality index in Washington is 18% better than the national average
  • The pollution index in Washington is 87% better than the national average

Compare Washington, IL Weather

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      Washington 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
      January17°F37°F26°F2.3"
      February18°F39°F28°F2.1"
      March31°F54°F42°F3.1"
      April41°F67°F54°F4.7"
      May51°F77°F64°F4.4"
      June62°F85°F73°F5.4"
      July65°F88°F76°F3.4"
      August64°F86°F74°F3.5"
      September56°F81°F68°F4.1"
      October44°F68°F55°F3.4"
      November33°F55°F43°F2.9"
      December22°F39°F30°F2.7"

      Washington 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.
      IndexWashingtonIllinoisNational
      Air quality index414150
      Pollution index672,0313,347,2955,066,862

      Washington air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality285
      Days with moderate air quality78
      Days w/ poor A.Q. for sensitive groups2
      Days with unhealthy air quality0

      Washington air quality information

      PollutantTotal
      Arsenic0.001%
      Benzene0.030%
      Carbon Tetrachloride0.000%
      Lead0.001%
      Mercury0.020%

      Average monthly Washington temperature with heat index

      Washington monthly precipitation with daily maximum

      Washington monthly snow depth with daily maximum

      Washington monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Germantown Hills, IL3,4914118%
      Rome, IL1,7544118%
      Deer Creek, IL7714118%
      North Pekin, IL1,4494118%
      West Peoria, IL4,6654118%
      Washington, IL16,1024118%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Siloam Springs, AR16,0954412%
      Spanish Springs, NV16,091468%
      Madison, NJ16,090512%
      Mount Pleasant, TX16,1153726%
      Alamo, CA16,0784020%
      Washington, IL16,1024118%
      Source: The Washington, 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.