Ozark, Alabama · field elev 358 ft
Density Altitude at Ozark/Blackwell Field (71J)
Ozark/Blackwell Field sits at 358 ft, and even a typical July afternoon (93 °F) only lifts density altitude to about 2,624 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 | 50.8 | −83 ft | 61.7 | 637 ft |
| February | 54.6 | 170 ft | 65.8 | 903 ft |
| March | 60.8 | 578 ft | 72.9 | 1,358 ft |
| April | 67.2 | 993 ft | 79.3 | 1,762 ft |
| May | 75.6 | 1,529 ft | 87.2 | 2,252 ft |
| June | 81.1 | 1,874 ft | 91.3 | 2,503 ft |
| July | 83.0 | 1,992 ft | 93.3 | 2,624 ft |
| August | 82.0 | 1,930 ft | 92.0 | 2,546 ft |
| September | 77.9 | 1,674 ft | 88.4 | 2,326 ft |
| October | 68.9 | 1,103 ft | 80.8 | 1,855 ft |
| November | 58.9 | 454 ft | 71.1 | 1,243 ft |
| December | 53.1 | 70 ft | 63.8 | 774 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 71J
DENSITY ALTITUDE
Field elevation 358 ft — the air behaves like 2,606 ft.
- PRESSURE ALT
- 359 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 Alabama fields
- KDHN — Dothan Regional
Dothan · elev 401 ft
- KHDL — Headland Municipal
Headland · elev 359 ft
- KEDN — Enterprise Municipal
Enterprise · elev 361 ft
- 0J0 — Abbeville Municipal
Abbeville · elev 468 ft
- 14J — Carl Folsom
Elba · elev 258 ft
- 33J — Geneva Municipal
Geneva · elev 100 ft
- 11A — Clayton Municipal
Clayton · elev 435 ft
- 1A4 — Logan Field
Samson · elev 200 ft
Frequently asked questions
How high does density altitude get at 71J in summer?
On a typical July afternoon — around 93 °F at the nearest NOAA normals station — density altitude at Ozark/Blackwell Field reaches roughly 2,624 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 71J on an average day?
It swings with the seasons: from roughly −83 ft at the coldest month's average temperature to about 1,992 ft at the warmest month's — all from a constant field elevation of 358 ft. The month-by-month table above carries the full year.
What is the field elevation of Ozark/Blackwell Field?
358 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 71J (FAA), in Ozark, Alabama.