Galliano, Louisiana · field elev 0 ft
Density Altitude at South Lafourche Leonard Miller Jr (KGAO)
South Lafourche Leonard Miller Jr sits at 0 ft, and even a typical August afternoon (89 °F) only lifts density altitude to about 1,951 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 | 53.9 | −320 ft | 62.9 | 274 ft |
| February | 57.3 | −94 ft | 66.1 | 482 ft |
| March | 63.0 | 280 ft | 71.4 | 823 ft |
| April | 68.6 | 643 ft | 76.6 | 1,154 ft |
| May | 75.5 | 1,084 ft | 82.9 | 1,549 ft |
| June | 80.8 | 1,418 ft | 87.7 | 1,846 ft |
| July | 82.4 | 1,518 ft | 89.3 | 1,945 ft |
| August | 82.5 | 1,524 ft | 89.4 | 1,951 ft |
| September | 79.4 | 1,330 ft | 86.4 | 1,766 ft |
| October | 71.2 | 810 ft | 79.6 | 1,342 ft |
| November | 61.7 | 195 ft | 71.2 | 810 ft |
| December | 56.2 | −167 ft | 64.9 | 404 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 KGAO
DENSITY ALTITUDE
Field elevation 0 ft — the air behaves like 1,926 ft.
- PRESSURE ALT
- 1 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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Frequently asked questions
How high does density altitude get at KGAO in summer?
On a typical August afternoon — around 89 °F at the nearest NOAA normals station — density altitude at South Lafourche Leonard Miller Jr reaches roughly 1,951 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 KGAO on an average day?
It swings with the seasons: from roughly −320 ft at the coldest month's average temperature to about 1,524 ft at the warmest month's — all from a constant field elevation of 0 ft. The month-by-month table above carries the full year.
What is the field elevation of South Lafourche Leonard Miller Jr?
0 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGAO (ICAO) / GAO (FAA), in Galliano, Louisiana.