TODAY JUN22
TEMPERATURE70
HUMIDITY100
PRESSURE29.72
WIND COND.270 9.2
  • 8267Sat30%
  • 8768Sun30%20%
  • 8771Mon30%20%
  • 9174Tue20%30%
  • 9374Wed40%
daynightWeather update from St. Louis Regional Airport at

Troy 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
January-2°F72°F34°F3.3"
February1°F75°F34°F1.9"
March15°F84°F47°F4.1"
April24°F91°F56°F3.9"
May36°F93°F65°F4.7"
June52°F99°F76°F3.3"
July57°F100°F77°F4.5"
August52°F105°F77°F2.0"
September39°F95°F69°F5.0"
October27°F92°F56°F4.6"
November18°F81°F47°F3.0"
December1°F66°F34°F3.4"

Did you know?

  • The highest monthly average temperature in Troy for August is 77 degrees.
  • The lowest monthly average temperature in Troy for January is 34 degrees.
  • The most monthly precipitation in Troy occurs in September with 5 inches.
  • The air quality index in Troy is 20% worse than the national average.
  • The pollution index in Troy is 19% worse than the national average.

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Compare Troy, IL Weather To Other Cities

Troy 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.
IndexTroyIllinoisNational
Air quality index604150
Pollution index6,055,6403,347,2955,066,862

Troy air quality information

MeasurementTotal
Days measured365
Days with good air quality99
Days with moderate air quality231
Days w/ poor A.Q. for sensitive groups33
Days with unhealthy air quality2

Troy air quality information

PollutantTotal
Arsenic0.010%
Benzene0.070%
Carbon Tetrachloride0.040%
Lead0.100%
Mercury0.230%

Average monthly Troy temperature with heat index

Troy monthly precipitation with daily maximum

Troy monthly snow depth with daily maximum

Troy monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
South Roxana, IL2,3166020%
Venice, IL1,8986020%
Alhambra, IL5236020%
Bethalto, IL9,3646020%
Collinsville, IL24,8556020%
Troy, IL10,0416020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Gages Lake, IL10,0413530%
Bonham, TX10,040325550%
Indianola, MS10,0473726%
Waverly, IA10,0494314%
Avon Park, FL10,0522844%
Troy, IL10,0416020%
Source: The Troy, 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.