San Antonio, Texas · field elev 578 ft
Density Altitude at Stinson Municipal (KSSF)
Stinson Municipal sits at 578 ft, and even a typical August afternoon (98 °F) only lifts density altitude to about 3,145 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 | 53.5 | 369 ft | 64.7 | 1,103 ft |
| February | 58.0 | 666 ft | 69.2 | 1,392 ft |
| March | 64.4 | 1,083 ft | 75.3 | 1,780 ft |
| April | 71.1 | 1,513 ft | 81.9 | 2,193 ft |
| May | 78.2 | 1,962 ft | 88.1 | 2,575 ft |
| June | 83.8 | 2,311 ft | 93.6 | 2,910 ft |
| July | 85.8 | 2,434 ft | 96.2 | 3,067 ft |
| August | 86.6 | 2,483 ft | 97.5 | 3,145 ft |
| September | 81.3 | 2,155 ft | 91.3 | 2,771 ft |
| October | 72.7 | 1,615 ft | 83.7 | 2,304 ft |
| November | 62.2 | 941 ft | 73.3 | 1,653 ft |
| December | 55.1 | 475 ft | 66.3 | 1,206 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 KSSF
DENSITY ALTITUDE
Field elevation 578 ft — the air behaves like 3,175 ft.
- PRESSURE ALT
- 579 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
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- 53T — Cannon Field
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- KSAT — San Antonio International
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- T94 — Twin-Oaks
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- KCVB — Castroville Municipal
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- 8T8 — San Geronimo Airpark
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- KPEZ — Pleasanton Municipal
Pleasanton · elev 430 ft
Frequently asked questions
How high does density altitude get at KSSF in summer?
On a typical August afternoon — around 98 °F at the nearest NOAA normals station — density altitude at Stinson Municipal reaches roughly 3,145 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 KSSF on an average day?
It swings with the seasons: from roughly 369 ft at the coldest month's average temperature to about 2,483 ft at the warmest month's — all from a constant field elevation of 578 ft. The month-by-month table above carries the full year.
What is the field elevation of Stinson Municipal?
578 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSSF (ICAO) / SSF (FAA), in San Antonio, Texas.