West Chester, Pennsylvania · field elev 465 ft
Density Altitude at Brandywine Regional (KOQN)
Brandywine Regional sits at 465 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,321 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 | 29.6 | −1,407 ft | 39.5 | −717 ft |
| February | 31.9 | −1,245 ft | 42.5 | −512 ft |
| March | 39.8 | −697 ft | 50.9 | 56 ft |
| April | 50.7 | 42 ft | 63.2 | 866 ft |
| May | 60.8 | 710 ft | 73.0 | 1,496 ft |
| June | 70.4 | 1,330 ft | 82.0 | 2,061 ft |
| July | 75.0 | 1,622 ft | 86.2 | 2,321 ft |
| August | 73.0 | 1,496 ft | 84.4 | 2,210 ft |
| September | 65.9 | 1,041 ft | 78.0 | 1,811 ft |
| October | 53.7 | 242 ft | 66.1 | 1,054 ft |
| November | 43.4 | −450 ft | 54.9 | 322 ft |
| December | 34.8 | −1,043 ft | 44.4 | −382 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 KOQN
DENSITY ALTITUDE
Field elevation 465 ft — the air behaves like 2,308 ft.
- PRESSURE ALT
- 466 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 Pennsylvania fields
- N57 — New Garden
Toughkenamon · elev 435 ft
- KMQS — Chester County G O Carlson
Coatesville · elev 660 ft
- KPTW — Heritage Field
Pottstown · elev 308 ft
- N47 — Pottstown Municipal
Pottstown · elev 256 ft
- KLOM — Wings Field
Philadelphia · elev 302 ft
- KPHL — Philadelphia International
Philadelphia · elev 36 ft
- 7N8 — Butter Valley Golf Port
Bally · elev 500 ft
- KPNE — Northeast Philadelphia
Philadelphia · elev 120 ft
Frequently asked questions
How high does density altitude get at KOQN in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Brandywine Regional reaches roughly 2,321 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 KOQN on an average day?
It swings with the seasons: from roughly −1,407 ft at the coldest month's average temperature to about 1,622 ft at the warmest month's — all from a constant field elevation of 465 ft. The month-by-month table above carries the full year.
What is the field elevation of Brandywine Regional?
465 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KOQN (ICAO) / OQN (FAA), in West Chester, Pennsylvania.