Haleyville, Alabama · field elev 930 ft
Density Altitude at Posey Field (1M4)
Posey Field sits at 930 ft, and even a typical July afternoon (89 °F) only lifts density altitude to about 3,059 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 | 42.1 | 39 ft | 51.2 | 652 ft |
| February | 46.0 | 303 ft | 55.6 | 943 ft |
| March | 53.8 | 824 ft | 64.6 | 1,529 ft |
| April | 61.5 | 1,329 ft | 72.9 | 2,059 ft |
| May | 69.0 | 1,812 ft | 79.2 | 2,455 ft |
| June | 76.0 | 2,255 ft | 85.9 | 2,869 ft |
| July | 79.2 | 2,455 ft | 89.0 | 3,059 ft |
| August | 78.8 | 2,430 ft | 89.0 | 3,059 ft |
| September | 73.6 | 2,104 ft | 84.0 | 2,752 ft |
| October | 62.8 | 1,413 ft | 73.7 | 2,110 ft |
| November | 51.8 | 691 ft | 61.9 | 1,355 ft |
| December | 44.4 | 195 ft | 53.3 | 791 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 1M4
DENSITY ALTITUDE
Field elevation 930 ft — the air behaves like 3,059 ft.
- PRESSURE ALT
- 931 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
- M22 — Bill Pugh Field
Russellville · elev 718 ft
- KHAB — Marion County-Rankin Fite
Hamilton · elev 436 ft
- 2A8 — Addison
Addison · elev 786 ft
- 9A4 — Courtland
Courtland · elev 588 ft
- KJFX — Walker County/Bevill Field
Jasper · elev 483 ft
- KMSL — Northwest Alabama Regional
Muscle Shoals · elev 551 ft
- 5M0 — Hartselle/Morgan County Regional
Hartselle · elev 629 ft
- M95 — Richard Arthur Field
Fayette · elev 357 ft
Frequently asked questions
How high does density altitude get at 1M4 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Posey Field reaches roughly 3,059 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 1M4 on an average day?
It swings with the seasons: from roughly 39 ft at the coldest month's average temperature to about 2,455 ft at the warmest month's — all from a constant field elevation of 930 ft. The month-by-month table above carries the full year.
What is the field elevation of Posey Field?
930 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1M4 (FAA), in Haleyville, Alabama.