TODAY NOV02
TEMPERATURE41
HUMIDITY
PRESSURE102070
WIND COND.200 14.8
  • 5138Sun60%80%
  • 4826Mon20%
  • 5030Tue
  • 4628Wed30%
  • 4430Thu
daynightWeather update from CAVALIER at
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Weather Quick Facts

  • The highest monthly average temperature in St. Thomas for July is 68.1 degrees
  • The lowest monthly average temperature in St. Thomas for January is 6.1 degrees
  • The most monthly precipitation in St. Thomas occurs in January with 19.8 inches
  • The air quality index in St. Thomas is 22% better than the national average
  • The pollution index in St. Thomas is 80% better than the national average

Compare St. Thomas, ND Weather

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      St. Thomas 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
      January-3°F16°F6°F19.8"
      February-2°F18°F7°F6.0"
      March14°F33°F23°F3.3"
      April30°F53°F40°F1.1"
      May41°F67°F53°F3.3"
      June52°F76°F63°F4.2"
      July56°F81°F68°F2.7"
      August53°F80°F66°F2.2"
      September46°F73°F58°F2.6"
      October34°F56°F44°F1.9"
      November19°F37°F27°F1.3"
      December2°F19°F10°F9.7"

      St. Thomas 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. ThomasNorth DakotaNational
      Air quality index333542
      Pollution index536,1221,038,6652,726,193

      St. Thomas air quality

      MeasurementTotal
      Days measured363
      Days with good air quality327
      Days with moderate air quality34
      Days w/ poor A.Q. for sensitive groups1
      Days with unhealthy air quality1

      Air quality details

      PollutantTotal
      Arsenic0.010%
      Benzene0.010%
      Carbon Tetrachloride0.001%
      Lead0.020%
      Mercury0.004%

      Average monthly St. Thomas temperature with heat index

      St. Thomas monthly precipitation with daily maximum

      St. Thomas monthly snow depth with daily maximum

      St. Thomas monthly wind speed information

      Nearby cities with good air quality

      CityPopulationAir Quality IndexNational Avg.
      Hoople, ND2653334.0%
      Grafton, ND4,1393334.0%
      Canton City, ND193334.0%
      Drayton, ND8033334.0%
      Hamilton, ND583334.0%
      St. Thomas, ND3403334.0%

      Cities with similar population

      CityPopulationAir Quality IndexNational Avg.
      St. Michael, AK3403138.0%
      Cazadero, CA3403432.0%
      Chilcoot-Vinton, CA340468.0%
      St. Marks, FL3404020.0%
      Ryan, IA3403922.0%
      St. Thomas, ND3403334.0%
      Source: The St. Thomas, ND 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.