Mount Vernon, Illinois · field elev 480 ft
Density Altitude at Mount Vernon (KMVN)
Mount Vernon sits at 480 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,308 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 | 30.1 | −1,353 ft | 38.5 | −768 ft |
| February | 34.3 | −1,059 ft | 43.6 | −418 ft |
| March | 43.7 | −411 ft | 53.6 | 254 ft |
| April | 54.5 | 314 ft | 64.9 | 995 ft |
| May | 64.4 | 963 ft | 73.8 | 1,565 ft |
| June | 73.1 | 1,520 ft | 82.4 | 2,104 ft |
| July | 76.5 | 1,735 ft | 85.7 | 2,308 ft |
| August | 74.8 | 1,628 ft | 84.8 | 2,253 ft |
| September | 67.7 | 1,176 ft | 78.6 | 1,867 ft |
| October | 56.1 | 420 ft | 67.5 | 1,163 ft |
| November | 44.0 | −391 ft | 53.7 | 261 ft |
| December | 34.5 | −1,045 ft | 42.9 | −466 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 KMVN
DENSITY ALTITUDE
Field elevation 480 ft — the air behaves like 2,327 ft.
- PRESSURE ALT
- 481 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
- KENL — Centralia Municipal
Centralia · elev 534 ft
- H96 — Benton Municipal
Benton · elev 444 ft
- KSLO — Salem-Leckrone
Salem · elev 573 ft
- KFWC — Fairfield Municipal
Fairfield · elev 434 ft
- KFOA — Flora Municipal
Flora · elev 473 ft
- KPJY — Pinckneyville/Du Quoin
Pinckneyville · elev 400 ft
- KHSB — Harrisburg-Raleigh
Harrisburg · elev 398 ft
- KMWA — Veterans Airport Of Southern Illinois
Marion · elev 472 ft
Frequently asked questions
How high does density altitude get at KMVN in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Mount Vernon reaches roughly 2,308 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 KMVN on an average day?
It swings with the seasons: from roughly −1,353 ft at the coldest month's average temperature to about 1,735 ft at the warmest month's — all from a constant field elevation of 480 ft. The month-by-month table above carries the full year.
What is the field elevation of Mount Vernon?
480 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMVN (ICAO) / MVN (FAA), in Mount Vernon, Illinois.