St Louis, Missouri · field elev 463 ft
Density Altitude at Spirit Of St Louis (KSUS)
Spirit Of St Louis sits at 463 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,521 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 | 31.5 | −1,276 ft | 41.0 | −617 ft |
| February | 36.1 | −955 ft | 46.5 | −243 ft |
| March | 45.9 | −283 ft | 57.4 | 485 ft |
| April | 56.4 | 419 ft | 68.4 | 1,200 ft |
| May | 66.0 | 1,045 ft | 77.2 | 1,758 ft |
| June | 74.8 | 1,607 ft | 85.7 | 2,288 ft |
| July | 78.7 | 1,853 ft | 89.5 | 2,521 ft |
| August | 76.9 | 1,740 ft | 88.1 | 2,435 ft |
| September | 68.7 | 1,219 ft | 80.9 | 1,990 ft |
| October | 57.3 | 478 ft | 69.5 | 1,270 ft |
| November | 45.3 | −324 ft | 56.2 | 406 ft |
| December | 35.7 | −982 ft | 45.1 | −337 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 KSUS
DENSITY ALTITUDE
Field elevation 463 ft — the air behaves like 2,551 ft.
- PRESSURE ALT
- 464 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
Nearby Missouri fields
- 1H0 — Creve Coeur
St Louis · elev 462 ft
- KSTL — St Louis Lambert International
St Louis · elev 617 ft
- KFYG — Washington Regional
Washington · elev 488 ft
- KSET — St Charles County Regional/Smartt Field
St Charles · elev 437 ft
- M71 — Greensfield
Moscow Mills · elev 559 ft
- KUUV — Sullivan Regional
Sullivan · elev 933 ft
- 63M — Hermann Municipal
Hermann · elev 508 ft
- 8WC — Washington County
Potosi · elev 959 ft
Frequently asked questions
How high does density altitude get at KSUS in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Spirit Of St Louis reaches roughly 2,521 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 KSUS on an average day?
It swings with the seasons: from roughly −1,276 ft at the coldest month's average temperature to about 1,853 ft at the warmest month's — all from a constant field elevation of 463 ft. The month-by-month table above carries the full year.
What is the field elevation of Spirit Of St Louis?
463 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSUS (ICAO) / SUS (FAA), in St Louis, Missouri.