San Antonio, Texas · field elev 691 ft
Density Altitude at Kelly Field (KSKF)
Kelly Field sits at 691 ft, and even a typical August afternoon (97 °F) only lifts density altitude to about 3,240 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 | 52.6 | 449 ft | 64.1 | 1,203 ft |
| February | 56.8 | 727 ft | 69.6 | 1,556 ft |
| March | 63.6 | 1,171 ft | 75.2 | 1,912 ft |
| April | 70.2 | 1,595 ft | 81.9 | 2,331 ft |
| May | 77.5 | 2,056 ft | 88.6 | 2,743 ft |
| June | 82.4 | 2,362 ft | 93.0 | 3,011 ft |
| July | 84.9 | 2,516 ft | 95.9 | 3,186 ft |
| August | 85.5 | 2,553 ft | 96.8 | 3,240 ft |
| September | 80.7 | 2,256 ft | 91.8 | 2,938 ft |
| October | 72.3 | 1,728 ft | 84.2 | 2,473 ft |
| November | 60.4 | 963 ft | 71.8 | 1,697 ft |
| December | 53.2 | 489 ft | 65.1 | 1,268 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 KSKF
DENSITY ALTITUDE
Field elevation 691 ft — the air behaves like 3,252 ft.
- PRESSURE ALT
- 692 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 Texas fields
- KSSF — Stinson Municipal
San Antonio · elev 578 ft
- 74R — Horizon
San Antonio · elev 551 ft
- 53T — Cannon Field
Somerset · elev 610 ft
- KSAT — San Antonio International
San Antonio · elev 809 ft
- T94 — Twin-Oaks
San Antonio · elev 873 ft
- 8T8 — San Geronimo Airpark
San Antonio · elev 1,040 ft
- KCVB — Castroville Municipal
Castroville · elev 774 ft
- 5C1 — Boerne Stage Airfield
San Antonio · elev 1,384 ft
Frequently asked questions
How high does density altitude get at KSKF in summer?
On a typical August afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Kelly Field reaches roughly 3,240 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 KSKF on an average day?
It swings with the seasons: from roughly 449 ft at the coldest month's average temperature to about 2,553 ft at the warmest month's — all from a constant field elevation of 691 ft. The month-by-month table above carries the full year.
What is the field elevation of Kelly Field?
691 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSKF (ICAO) / SKF (FAA), in San Antonio, Texas.