TODAY OCT07
TEMPERATURE67
HUMIDITY12
PRESSURE102850
WIND COND.250 22.3
  • 5238Tue
  • 5138Wed
  • 5340Thu
  • 5439Fri
  • 5236Sat
daynightWeather update from Granby-Grand County Airport at
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Weather Quick Facts

  • The highest monthly average temperature in St. Mary's for July is 74.7 degrees
  • The lowest monthly average temperature in St. Mary's for December is 29.7 degrees
  • The most monthly precipitation in St. Mary's occurs in November with 2.6 inches
  • The air quality index in St. Mary's is 12% worse than the national average
  • The pollution index in St. Mary's is 281% worse than the national average

Compare St. Mary's, CO Weather

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      St. Mary's 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
      January18°F48°F32°F1.2"
      February21°F50°F34°F1.5"
      March30°F62°F44°F1.6"
      April36°F66°F49°F0.2"
      May43°F73°F57°F2.4"
      June54°F89°F71°F1.1"
      July59°F92°F75°F2.1"
      August56°F90°F72°F1.1"
      September49°F82°F64°F0.2"
      October38°F69°F52°F2.1"
      November28°F58°F41°F2.6"
      December17°F46°F30°F0.7"

      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 index473842
      Pollution index10,378,1002,068,3422,726,193

      St. Mary's air quality

      MeasurementTotal
      Days measured365
      Days with good air quality227
      Days with moderate air quality133
      Days w/ poor A.Q. for sensitive groups5
      Days with unhealthy air quality0

      Air quality details

      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

      CityPopulationAir Quality IndexNational Avg.
      Coal Creek, CO2,605476.0%
      Winter Park, CO864476.0%
      Downieville-Lawson-Dumont, CO487476.0%
      Idaho Springs, CO1,848476.0%
      Nederland, CO1,465476.0%
      St. Mary's, CO416476.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      Jerome, AZ4164314.0%
      Between, GA4164412.0%
      Earling, IA4164020.0%
      Hartsville, IN4164118.0%
      Hazleton, IN4163628.0%
      St. Mary's, CO416476.0%
      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.