Farmington, Delaware · field elev 65 ft
Density Altitude at Chorman (D74)
Chorman sits at 65 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 1,864 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 | 34.5 | −1,563 ft | 43.6 | −934 ft |
| February | 36.0 | −1,458 ft | 45.7 | −791 ft |
| March | 43.4 | −948 ft | 53.9 | −239 ft |
| April | 53.5 | −266 ft | 64.7 | 471 ft |
| May | 62.6 | 334 ft | 73.3 | 1,024 ft |
| June | 71.9 | 935 ft | 82.1 | 1,578 ft |
| July | 76.7 | 1,239 ft | 86.7 | 1,864 ft |
| August | 74.9 | 1,126 ft | 85.0 | 1,759 ft |
| September | 68.4 | 710 ft | 78.9 | 1,378 ft |
| October | 57.2 | −20 ft | 68.2 | 697 ft |
| November | 47.2 | −689 ft | 57.3 | −14 ft |
| December | 38.8 | −1,264 ft | 48.2 | −622 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 D74
DENSITY ALTITUDE
Field elevation 65 ft — the air behaves like 1,882 ft.
- PRESSURE ALT
- 66 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 Delaware fields
- KGED — Delaware Coastal
Georgetown · elev 53 ft
- 15N — Jenkins
Wyoming · elev 53 ft
- KDOV — Dover AFB
Dover · elev 29 ft
- N06 — Laurel
Laurel · elev 30 ft
- 0N4 — Chandelle
Dover · elev 22 ft
- 33N — Delaware Airpark
Dover/Cheswold · elev 55 ft
- 38N — Smyrna
Smyrna · elev 18 ft
- KEVY — Summit
Middletown · elev 70 ft
Frequently asked questions
How high does density altitude get at D74 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Chorman reaches roughly 1,864 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 D74 on an average day?
It swings with the seasons: from roughly −1,563 ft at the coldest month's average temperature to about 1,239 ft at the warmest month's — all from a constant field elevation of 65 ft. The month-by-month table above carries the full year.
What is the field elevation of Chorman?
65 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is D74 (FAA), in Farmington, Delaware.