TODAY JUN21
TEMPERATURE74
HUMIDITY91
PRESSURE29.79
WIND COND.210 3.4
  • 8363Thu40%60%
  • 7761Fri60%60%
  • 8366Sat30%
  • 8667Sun40%20%
  • 8570Mon20%
daynightWeather update from St. Charles, St. Charles County Smartt Airport at

Chain of Rocks 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-5°F73°F32°F2.8"
February1°F73°F33°F2.1"
March13°F83°F46°F3.0"
April23°F94°F56°F3.3"
May33°F93°F65°F4.2"
June50°F97°F75°F2.9"
July55°F102°F77°F3.6"
August53°F103°F77°F3.4"
September38°F95°F69°F3.2"
October25°F94°F56°F4.4"
November17°F81°F46°F2.5"
December3°F67°F33°F3.1"

Did you know?

  • The highest monthly average temperature in Chain of Rocks for July is 77 degrees.
  • The lowest monthly average temperature in Chain of Rocks for January is 32 degrees.
  • The most monthly precipitation in Chain of Rocks occurs in October with 4.4 inches.
  • The air quality index in Chain of Rocks is 20% worse than the national average.
  • The pollution index in Chain of Rocks is 39% better than the national average.

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Compare Chain of Rocks, MO Weather To Other Cities

Chain of Rocks 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.
IndexChain of RocksMissouriNational
Air quality index609750
Pollution index3,042,5302,360,5665,066,862

Chain of Rocks 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

Chain of Rocks air quality information

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

Average monthly Chain of Rocks temperature with heat index

Chain of Rocks monthly precipitation with daily maximum

Chain of Rocks monthly snow depth with daily maximum

Chain of Rocks monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Cottleville, MO4,2056020%
Foristell, MO6246020%
Lake St. Louis, MO15,1506020%
Old Monroe, MO2016020%
Troy, MO11,3746020%
Chain of Rocks, MO1006020%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Willard, KS1003628%
Los Nopalitos, TX1003824%
Barneston, NE1003432%
Cornucopia, WI1003726%
Ormsby, MN1003530%
Chain of Rocks, MO1006020%
Source: The Chain of Rocks, MO 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.