TODAY AUG22
TEMPERATURE79
HUMIDITY62
PRESSURE29.95
WIND COND.350 15
  • 8764Mon
  • 8768Tue20%
  • 7966Wed50%60%
  • 8264Thu30%20%
  • 8263Fri20%
daynightWeather update from Illinois Valley Regional Airport at

Princeton Average Weather

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°F34°F26°F3.3"
February19°F35°F26°F3.0"
March32°F51°F40°F4.3"
April42°F64°F52°F7.2"
May53°F75°F63°F8.0"
June62°F83°F72°F7.5"
July66°F85°F75°F7.1"
August64°F83°F73°F8.2"
September56°F78°F66°F6.3"
October45°F65°F54°F6.6"
November34°F51°F42°F4.3"
December23°F37°F30°F3.5"

Did you know?

  • The highest monthly average temperature in Princeton for July is 75 degrees.
  • The lowest monthly average temperature in Princeton for January is 26 degrees.
  • The most monthly precipitation in Princeton occurs in August with 8.2 inches.
  • The air quality index in Princeton is 97% better than the national average.
  • The pollution index in Princeton is 58% better than the national average.

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Compare Princeton, IL Weather To Other Cities

Princeton 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.
IndexPrincetonIllinoisNational
Air quality index14150
Pollution index2,097,7403,347,2955,066,862

Princeton air quality information

MeasurementTotal
Days measured351
Days with good air quality351
Days with moderate air quality
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

Princeton air quality information

PollutantTotal
Arsenic0.001%
Benzene0.060%
Carbon Tetrachloride0.000%
Lead0.001%
Mercury0.300%

Average monthly Princeton temperature with heat index

Princeton monthly precipitation with daily maximum

Princeton monthly snow depth with daily maximum

Princeton monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
De Pue, IL1,661198%
Hollowayville, IL52198%
Malden, IL309198%
Ohio, IL470198%
Standard, IL234198%
Princeton, IL7,741198%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Wading River, NY7,742476%
Quincy, FL7,7433628%
Three Rivers, MI7,7433922%
Lander, WY7,7444216%
Southwest Ranches, FL7,7454118%
Princeton, IL7,741198%
Source: The Princeton, 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.