St Louis, Missouri · field elev 617 ft
Density Altitude at St Louis Lambert International (KSTL)
St Louis Lambert International sits at 617 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,714 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 32.1 | −1,041 ft | 40.4 | −466 ft |
| February | 36.7 | −721 ft | 45.8 | −99 ft |
| March | 46.6 | −45 ft | 56.6 | 622 ft |
| April | 57.5 | 681 ft | 68.0 | 1,363 ft |
| May | 67.5 | 1,331 ft | 77.1 | 1,941 ft |
| June | 76.5 | 1,903 ft | 85.9 | 2,488 ft |
| July | 80.4 | 2,147 ft | 89.6 | 2,714 ft |
| August | 78.8 | 2,047 ft | 88.3 | 2,635 ft |
| September | 71.0 | 1,555 ft | 81.1 | 2,191 ft |
| October | 59.1 | 786 ft | 69.2 | 1,440 ft |
| November | 46.5 | −51 ft | 55.5 | 550 ft |
| December | 36.5 | −735 ft | 44.5 | −187 ft |
▲ above 5,000 ft · ⚠ above 8,000 ft. These are planning references at standard pressure and dry air — afternoon humidity and low pressure both push the real number higher. Run today's values below.
Run today’s numbers for KSTL
DENSITY ALTITUDE
Field elevation 617 ft — the air behaves like 2,739 ft.
- PRESSURE ALT
- 618 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
- —
- AIR DENSITY
- —
- WATER · GRAINS/LB
- —
For training and reference · verify with official sources and your POH before flight · no tool on this site renders a go / no-go judgment
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- KFYG — Washington Regional
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- KUUV — Sullivan Regional
Sullivan · elev 933 ft
- 1BT — Bonne Terre Municipal
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- 8WC — Washington County
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Frequently asked questions
How high does density altitude get at KSTL in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at St Louis Lambert International reaches roughly 2,714 ft at standard pressure. Hotter-than-normal days, low pressure, and humidity all push it higher, so run the day's actual numbers before flying.
What is the density altitude at KSTL on an average day?
It swings with the seasons: from roughly −1,041 ft at the coldest month's average temperature to about 2,147 ft at the warmest month's — all from a constant field elevation of 617 ft. The month-by-month table above carries the full year.
What is the field elevation of St Louis Lambert International?
617 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSTL (ICAO) / STL (FAA), in St Louis, Missouri.