United States · elevation 413 ft AMSL
· 38.5707, -90.1562
St Louis Downtown Airport (Cahokia/St Louis) is an airport with the ICAO code KCPS and the IATA code CPS. Country: United States. Nearest settlement listed in the database: Cahokia/St Louis. OurAirports classifies it as a small airport. Its ICAO code starts with the KC prefix, which marks airports in United States. The four-letter code KCPS is used in flight operations and weather reports, while the three-letter IATA code CPS is used for ticketing and baggage handling. The airport reference point sits at 38°34'15"N, 90°09'22"W, at an elevation of 413 ft (126 m) above sea level. The applicable time zone is America/Chicago.
Aerial imagery showing the runway and apron layout - the zoom is matched to the longest runway.
| Threshold | Course | Length | Width | Surface |
|---|---|---|---|---|
| 05 | 50° | 853 m (2,799 ft) | 23 m (75 ft) | asphalt |
| 23 | 230° | |||
| 12L | 120° | 1,616 m (5,301 ft) | 23 m (75 ft) | asphalt |
| 30R | 300° | |||
| 12R | 120° | 2,134 m (7,002 ft) | 46 m (150 ft) | asphalt |
| 30L | 300° |
The course is derived from the runway designator (number × 10), not from a survey - the actual magnetic bearing can differ by a few degrees.
Declared distances (TORA, TODA, ASDA, LDA) are published in the national AIP - they are not part of this table.
What the METAR reports from KCPS for 2023-2025 show - counted hour by hour.
We computed these statistics from 24,646 METAR reports issued by KCPS in 2023-2025. VFR conditions prevailed 83% of the time, MVFR 11% and IFR or LIFR 5%. Best month for VFR flying: July (90% of hours VFR). Most IFR and LIFR hours: January (14%).
Through the day, IFR or LIFR conditions are most frequent around 11:00 UTC (9% of reports at that hour) and least frequent around 00:00 UTC (3%).
Fog (FG) was reported on 15 days a year on average, most often in January. Thunderstorms (TS) occurred on 31 days a year on average, and snowfall on 13.
The wind most often blows from S (180°) - 11% of reports. Calm (0 kt) made up 21% of reports, and gusts of 25 kt or more appeared in 3%. Warmest month: July (average high 32.2 °C); coldest: January (average low -3.0 °C).
Day counts are for the selected period (for all years - the yearly average).
The top of each bar is the average daily high, the bottom the average daily low (usually around dawn), in °C.
Most often: S - 11% of reports. Each petal shows the direction the wind blows from (as in METAR) - the longer it is, the more often. Colour shows wind speed.
| Month | Avg high °C | Avg low °C | VFR | IFR/LIFR | Fog days | Thunderstorm days | Snow days |
|---|---|---|---|---|---|---|---|
| January | 5.1 | -3.0 | 63% | 14% | 3 | 0 | 4.7 |
| February | 11.7 | -0.3 | 83% | 6% | 0.7 | 0.3 | 2.3 |
| March | 16.8 | 4.5 | 80% | 4% | 0 | 2.9 | 0.7 |
| April | 21.5 | 9.0 | 89% | 3% | 0.7 | 5.4 | 0 |
| May | 25.9 | 14.5 | 87% | 4% | 1.7 | 5 | 0 |
| June | 31.2 | 18.9 | 90% | 4% | 0.7 | 2.1 | 0 |
| July | 32.2 | 21.5 | 90% | 3% | 0.7 | 8.3 | 0 |
| August | 30.9 | 19.6 | 89% | 3% | 1 | 3.7 | 0 |
| September | 28.8 | 15.3 | 90% | 4% | 2.3 | 2.7 | 0 |
| October | 23.1 | 9.7 | 90% | 3% | 0 | 0.3 | 0 |
| November | 15.2 | 4.3 | 81% | 8% | 1.7 | 0.3 | 1.3 |
| December | 9.7 | 0.5 | 65% | 10% | 2.3 | 0.3 | 3.7 |
Temperatures are averages of daily highs and lows. Day counts are the average per month over the period.
According to OurAirports data (compiled from AIP and FAA sources), St Louis Downtown Airport (Cahokia/St Louis) has 3 runways: 05/23 - 853 m long (2,799 ft), 23 m wide, asphalt surface; 12L/30R - 1,616 m long (5,301 ft), 23 m wide, asphalt surface; 12R/30L - 2,134 m long (7,002 ft), 46 m wide, asphalt surface.
The longest of them is 12R/30L, at 2,134 m.
The thresholds are oriented as follows: 05/23 on 50° and 230° magnetic, 12L/30R on 120° and 300° magnetic, 12R/30L on 120° and 300° magnetic. A threshold designator is its magnetic heading divided by ten (ICAO Annex 14), so the runway axis can be read straight off the numbers.
For the 05/23 axis, wind from the south-east (around 140°) or from the north-west (around 320°) blows perpendicular to the runway and produces the largest crosswind component. Wind from around 50° or 230° acts along the runway, as a headwind or a tailwind. The decoder on this page computes those components automatically from the current METAR.
Weather reports for St Louis Downtown Airport (Cahokia/St Louis) are published under the ICAO code KCPS. A METAR is an observation of current conditions, usually issued every 30 or 60 minutes; a TAF is a forecast for the airport area, typically covering 9 to 30 hours.
The decoder breaks the KCPS report down into its parts: wind direction and speed including gusts and variability, visibility (including CAVOK and directional minimum visibility), weather phenomena by WMO code, cloud layers with their bases, temperature and dew point, QNH pressure, and the resulting flight category - VFR, MVFR, IFR or LIFR - using FAA thresholds.
Not every airport issues its own reports; many smaller airfields have no weather station. If no current data is available for KCPS, check the nearby airports listed below.
Reports always use UTC (the Z suffix). The America/Chicago zone is GMT-06:00 in winter and GMT-05:00 in summer - that is the shift to apply to the time in the report to get local time at the airport.
The closest airports in the database, measured in a straight line from the reference point, are St. Louis Lambert International Airport (St Louis) (KSTL, 27 km), Scott AFB/Midamerica Airport (Belleville) (KBLV, 28 km), St Louis Regional Airport (Alton/St Louis) (KALN, 37 km). When no report is available for KCPS, they usually give the best approximation of conditions in the area.
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The METAR archive for KCPS goes back to 19/12/1978. Pick a date and see every observation from that day.
Run a flying club, a training organisation or an airfield website? Embed a ready-made panel with the current KCPS METAR - flight category, wind, visibility, temperature and pressure, refreshed automatically. The configurator lets you pick language, theme and units; you paste the code once.
