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Key findings

  • The highest monthly average temperature in St. Joseph for August is 75.2 degrees
  • The lowest monthly average temperature in St. Joseph for February is 25.9 degrees
  • The most monthly precipitation in St. Joseph occurs in November with 7.3 inches
  • The air quality index in St. Joseph is 16% better than the national average
  • The pollution index in St. Joseph is 93% worse than the national average

Compare St. Joseph, IL Weather

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      St. Joseph 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
      January22°F36°F29°F6.9"
      February19°F34°F26°F3.4"
      March33°F54°F42°F3.3"
      April41°F65°F52°F5.8"
      May52°F78°F65°F3.4"
      June63°F85°F74°F6.1"
      July63°F83°F73°F5.8"
      August65°F86°F75°F5.4"
      September57°F83°F69°F7.0"
      October46°F69°F57°F5.6"
      November33°F53°F42°F7.3"
      December21°F35°F27°F3.7"

      St. Joseph 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.
      IndexSt. JosephIllinoisNational
      Air quality index424150
      Pollution index9,793,5403,347,2955,066,862

      St. Joseph air quality information

      MeasurementTotal
      Days measured365
      Days with good air quality281
      Days with moderate air quality84
      Days w/ poor A.Q. for sensitive groups0
      Days with unhealthy air quality0

      St. Joseph air quality information

      PollutantTotal
      Arsenic0.010%
      Benzene0.070%
      Carbon Tetrachloride0.010%
      Lead0.001%
      Mercury0.040%

      Average monthly St. Joseph temperature with heat index

      St. Joseph monthly precipitation with daily maximum

      St. Joseph monthly snow depth with daily maximum

      St. Joseph monthly wind speed information

      Nearby cities with good air quality

      City, StatePopulationAir Quality IndexNational Avg.
      Potomac, IL6754216%
      Tolono, IL3,1014216%
      Sidell, IL5204216%
      Oakwood, IL1,6664216%
      Homer, IL1,2894216%
      St. Joseph, IL4,1094216%

      Cities with similar population

      City, StatePopulationAir Quality IndexNational Avg.
      Rice Lake, MN4,1093334%
      Oliver Springs, TN4,110536%
      Fort Gibson, OK4,111590%
      Rumford, ME4,1114020%
      Lakewood, IL4,1114216%
      St. Joseph, IL4,1094216%
      Source: The St. Joseph, 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.