Oneonta, Alabama · field elev 1,125 ft
Density Altitude at Robbins Field (20A)
Robbins Field sits at 1,125 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 3,411 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 | 43.1 | 349 ft | 53.2 | 1,025 ft |
| February | 46.3 | 565 ft | 57.3 | 1,295 ft |
| March | 54.2 | 1,091 ft | 66.0 | 1,859 ft |
| April | 61.6 | 1,575 ft | 73.8 | 2,355 ft |
| May | 69.8 | 2,102 ft | 80.8 | 2,792 ft |
| June | 77.1 | 2,562 ft | 87.3 | 3,192 ft |
| July | 80.7 | 2,786 ft | 90.9 | 3,411 ft |
| August | 79.6 | 2,718 ft | 89.8 | 3,345 ft |
| September | 73.8 | 2,355 ft | 84.9 | 3,045 ft |
| October | 63.2 | 1,679 ft | 75.0 | 2,430 ft |
| November | 52.7 | 992 ft | 64.2 | 1,743 ft |
| December | 45.4 | 505 ft | 55.4 | 1,170 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 20A
DENSITY ALTITUDE
Field elevation 1,125 ft — the air behaves like 3,418 ft.
- PRESSURE ALT
- 1,126 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
- KGAD — Northeast Alabama Regional
Gadsden · elev 569 ft
- KBFZ — Albertville Regional/Thomas J Brumlik Field
Albertville · elev 1,032 ft
- KPLR — St Clair County
Pell City · elev 485 ft
- 8A1 — Guntersville Municipal/Joe Starnes Field
Guntersville · elev 615 ft
- KASN — Talladega Municipal
Talladega · elev 529 ft
- KCMD — Cullman Regional/Folsom Field
Cullman · elev 970 ft
- KBHM — Birmingham-Shuttlesworth International
Birmingham · elev 650 ft
- KANB — Anniston Regional
Anniston · elev 612 ft
Frequently asked questions
How high does density altitude get at 20A in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Robbins Field reaches roughly 3,411 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 20A on an average day?
It swings with the seasons: from roughly 349 ft at the coldest month's average temperature to about 2,786 ft at the warmest month's — all from a constant field elevation of 1,125 ft. The month-by-month table above carries the full year.
What is the field elevation of Robbins Field?
1,125 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 20A (FAA), in Oneonta, Alabama.