St Louis Weather Conditions and Forecast, December 19, 2017

St Louis Weather Conditions and Forecast, December 19, 2017

St Louis Weather Conditions, Forecast & Air Quality Index readings published by STL.News

ST LOUIS, MO/December 19, 2017 (STL.News) St Louis weather conditions & forecast readings from the St. Louis Lambert International Airport at 3:51 a.m at Latitude: 38.75°N, Longitude: 90.37°W – Elevation 604 feet.  Forecast is provided by the National Weather Service (N.W.S.).

Current Weather Conditions


Temperature: 38°F – 3°C
Humidity: 93%
Wind Speed: CALM
Barometer: 30.03 in (1017.2 MB)
Dew-point: 36°F – 2°C
Visibility: 10 Miles
Wind Chill: N/A°F – N/A°C
Heat Index: N/A°F – N/A°C

Extended Weather Forecast for the St Louis, Missouri area beginning December 19, 2017

Today: Possibly fog early am, cloudy – high near 53 with wind 6 to 9 mph from north in the pm.
Tonight: Mostly cloudy – low around 38 with wind 6 to 9 mph, east after midnight.
Wednesday: Mostly cloudy, becoming sunny – high near 50 with east wind 5 to 7 mph.
Wednesday Night: Partly cloudy – low around 36 with wind around 6 mph.
Thursday: Partly sunny – high near 54 with south wind 6 to 8 mph.
Thursday Night: Mostly cloudy – low around 43.
Friday: 30 percent chance of rain before noon, mostly cloudy – high near 49.
Friday Night: Chance of rain in the am, mostly cloudy – low around 27.  Chance of precipitation – 20%.
Saturday: Partly sunny – high near 36.
Saturday Night: Mostly cloudy – low around 22.
Sunday: 30 percent chance of snow/mostly cloudy – high near 32.
Sunday Night: 20 percent chance of snow, mostly cloudy – low around 18.
Christmas Day: Mostly sunny – high near 25.

Air Quality Index for Saint Louis, Missouri – (A.Q.I.)

Delayed Air Quality Index: 12/18/17 4:00 PM CST

  • Good – 38 AQI – Particle Pollution (2.5 microns)
  • Good – 26 AQI – Ozone
  • Good – 12 AQI – Particle Pollution (10 microns)

Agency: St. Louis Metropolitan Area (American Lung Association)

Air Quality Index (A.Q.I.)

Good – Air quality in considered “satisfactory” and air pollution poses little to no threat.

Moderate – Air quality is considered “acceptable.” However, some pollutants there may be a moderate health concern for a very small number of people who are sensitive to air pollution.

USG – while the general public will not likely be affected by this AQI range, people with lung disease, older adults and children are a great risk from exposure to ozone, whereas, persons with heart and lung disease, old adults and children are at greater risk from the presence of particles in the air.

Unhealthy – Everyone may begin to experience health effects members of sensitive groups may experience more serious health effects.

Very Unhealthy – Health Alert: everyone may experience more serious health effects.


Source: Current Weather Conditions and Forecast are obtained from the National Weather Service @ Forecast.Weather.Gov – Air Quality Index (AQI) readings are obtained from AirNow.Gov – (MS)


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