Belleville, Illinois · field elev 459 ft
Density Altitude at Scott AFB/Midamerica St Louis (KBLV)
Scott AFB/Midamerica St Louis sits at 459 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,559 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 | 33.6 | −1,134 ft | 42.9 | −492 ft |
| February | 38.3 | −808 ft | 48.6 | −106 ft |
| March | 47.8 | −160 ft | 59.2 | 598 ft |
| April | 58.3 | 539 ft | 70.6 | 1,335 ft |
| May | 67.7 | 1,150 ft | 79.1 | 1,873 ft |
| June | 75.9 | 1,672 ft | 87.3 | 2,381 ft |
| July | 79.0 | 1,866 ft | 90.2 | 2,559 ft |
| August | 77.2 | 1,754 ft | 89.1 | 2,492 ft |
| September | 70.1 | 1,304 ft | 83.3 | 2,134 ft |
| October | 59.7 | 631 ft | 72.6 | 1,463 ft |
| November | 47.5 | −180 ft | 58.1 | 526 ft |
| December | 37.3 | −877 ft | 46.3 | −261 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 KBLV
DENSITY ALTITUDE
Field elevation 459 ft — the air behaves like 2,547 ft.
- PRESSURE ALT
- 460 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 Illinois fields
- KCPS — St Louis Downtown
Cahokia/St Louis · elev 413 ft
- H07 — Highland-Winet
Highland · elev 537 ft
- KALN — St Louis Regional
Alton/St Louis · elev 544 ft
- KSAR — Sparta Community-Hunter Field
Sparta · elev 538 ft
- KGRE — Greenville
Greenville · elev 541 ft
- KENL — Centralia Municipal
Centralia · elev 534 ft
- 3LF — Litchfield Municipal
Litchfield · elev 691 ft
- KPJY — Pinckneyville/Du Quoin
Pinckneyville · elev 400 ft
Frequently asked questions
How high does density altitude get at KBLV in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Scott AFB/Midamerica St Louis reaches roughly 2,559 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 KBLV on an average day?
It swings with the seasons: from roughly −1,134 ft at the coldest month's average temperature to about 1,866 ft at the warmest month's — all from a constant field elevation of 459 ft. The month-by-month table above carries the full year.
What is the field elevation of Scott AFB/Midamerica St Louis?
459 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KBLV (ICAO) / BLV (FAA), in Belleville, Illinois.