TODAY SEP19
TEMPERATURE68
HUMIDITY100
PRESSURE29.94
WIND COND.
  • 9271Wed20%20%
  • 9272Thu
  • 8562Fri30%50%
  • 7461Sat
  • 7564Sun
daynightWeather update from Southern Illinois Airport at
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St. Johns 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
January25°F44°F34°F2.3"
February27°F46°F36°F2.5"
March38°F60°F48°F4.8"
April47°F70°F58°F6.2"
May56°F78°F67°F4.9"
June66°F88°F76°F4.1"
July68°F89°F78°F5.0"
August66°F88°F76°F3.5"
September57°F81°F68°F3.4"
October46°F71°F58°F3.6"
November36°F58°F46°F3.7"
December30°F47°F38°F3.7"

Did you know?

  • The highest monthly average temperature in St. Johns for July is 78 degrees.
  • The lowest monthly average temperature in St. Johns for January is 34 degrees.
  • The most monthly precipitation in St. Johns occurs in April with 6.2 inches.
  • The air quality index in St. Johns is 21% better than the national average.
  • The pollution index in St. Johns is 88% better than the national average.

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Compare St. Johns, IL Weather To Other Cities

St. Johns 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. JohnsIllinoisNational
Air quality index394150
Pollution index569,1783,347,2955,066,862

St. Johns air quality information

MeasurementTotal
Days measured243
Days with good air quality204
Days with moderate air quality39
Days w/ poor A.Q. for sensitive groups
Days with unhealthy air quality

St. Johns air quality information

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

Average monthly St. Johns temperature with heat index

St. Johns monthly precipitation with daily maximum

St. Johns monthly snow depth with daily maximum

St. Johns monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Bush, IL2443922%
Du Quoin, IL5,9323922%
Mulkeytown, IL1133922%
Pinckneyville, IL5,4223922%
Valier, IL6013922%
St. Johns, IL2343922%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Aurora, IA2344314%
Longdale, OK234476%
Standard, IL234198%
Rutland, IL234198%
Lake Tekakwitha, MO2346020%
St. Johns, IL2343922%
Source: The St. Johns, 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.