TODAY JUN25
TEMPERATURE77
HUMIDITY30
PRESSURE30.07
WIND COND.50 6.9
  • 6648Tue
  • 6750Wed
  • 6848Thu
  • 6244Fri
  • 5741Sat
daynightWeather update from Boulder Municipal Airport at

St. Mary's 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-15°F27°F10°Fn/a
February-9°F27°F10°Fn/a
March-8°F34°F11°Fn/a
April-6°F46°F20°Fn/a
May7°F54°F33°Fn/a
June16°F61°F41°Fn/a
July32°F63°F47°Fn/a
August28°F63°F46°Fn/a
September10°F55°F39°Fn/a
October1°F50°F29°Fn/a
November-6°F41°F23°Fn/a
December-18°F32°F8°Fn/a

Did you know?

  • The highest monthly average temperature in St. Mary's for July is 47 degrees.
  • The lowest monthly average temperature in St. Mary's for December is 8 degrees.
  • The most monthly precipitation in St. Mary's occurs in January with 0 inches.
  • The air quality index in St. Mary's is 15% better than the national average.
  • The pollution index in St. Mary's is 104% worse than the national average.

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Compare St. Mary's, CO Weather To Other Cities

St. Mary's 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. Mary'sColoradoNational
Air quality index423850
Pollution index10,378,1002,034,6195,066,862

St. Mary's air quality information

MeasurementTotal
Days measured363
Days with good air quality296
Days with moderate air quality63
Days w/ poor A.Q. for sensitive groups4
Days with unhealthy air quality

St. Mary's air quality information

PollutantTotal
Arsenic0.770%
Benzene0.030%
Carbon Tetrachloride2.620%
Lead0.070%
Mercury0.240%

Average monthly St. Mary's temperature with heat index

St. Mary's monthly precipitation with daily maximum

St. Mary's monthly snow depth with daily maximum

St. Mary's monthly wind speed information

Nearby cities with good air quality

City, StatePopulationAir Quality IndexNational Avg.
Georgetown, CO1,1434216%
Rollinsville, CO1464216%
Tabernash, CO4304216%
Central City, CO6994216%
Eldora, CO1194216%
St. Mary's, CO3294216%

Cities with similar population

City, StatePopulationAir Quality IndexNational Avg.
Rosemont, MD3294118%
Paxico, KS3293236%
Bradfordsville, KY3293628%
Lakeview Heights, KY3291962%
Custer City, OK3294216%
St. Mary's, CO3294216%
Source: The St. Mary's, CO 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.