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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"

Did you know?

  • The highest monthly average temperature in Washington for July is 76 degrees.
  • The lowest monthly average temperature in Washington for January is 26 degrees.
  • The most monthly precipitation in Washington occurs in June with 5.4 inches.
  • The air quality index in Washington is 3% better than the national average.
  • The pollution index in Washington is 86% better than the national average.

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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 index484150
Pollution index672,0313,347,2955,066,862

Washington air quality information

MeasurementTotal
Days measured365
Days with good air quality207
Days with moderate air quality132
Days w/ poor A.Q. for sensitive groups21
Days with unhealthy air quality5

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.
Congerville, IL5433628%
Goodfield, IL9313628%
Heritage Lake, IL1,4823628%
Danvers, IL1,2913628%
Bartonville, IL6,406484%
Washington, IL16,102484%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Siloam Springs, AR16,0953922%
Spanish Springs, NV16,09150= 100
Madison, NJ16,090536%
Mount Pleasant, TX16,1153334%
Alamo, CA16,0784314%
Washington, IL16,102484%
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.