Apalachicola, Florida · field elev 3 ft
Density Altitude at St George Island (F47)
St George Island sits at 3 ft, and even a typical July afternoon (92 °F) only lifts density altitude to about 2,083 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 | 53.8 | −323 ft | 64.0 | 349 ft |
| February | 56.6 | −137 ft | 67.2 | 557 ft |
| March | 61.7 | 199 ft | 71.8 | 852 ft |
| April | 67.5 | 576 ft | 77.5 | 1,214 ft |
| May | 75.2 | 1,069 ft | 85.4 | 1,708 ft |
| June | 81.0 | 1,434 ft | 89.5 | 1,961 ft |
| July | 83.0 | 1,559 ft | 91.5 | 2,083 ft |
| August | 82.6 | 1,534 ft | 90.6 | 2,028 ft |
| September | 79.9 | 1,365 ft | 88.4 | 1,893 ft |
| October | 72.1 | 871 ft | 82.3 | 1,515 ft |
| November | 62.6 | 258 ft | 73.9 | 986 ft |
| December | 56.5 | −143 ft | 67.0 | 544 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 F47
DENSITY ALTITUDE
Field elevation 3 ft — the air behaves like 2,114 ft.
- PRESSURE ALT
- 4 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 Florida fields
- KAAF — Apalachicola Regional-Cleve Randolph Field
Apalachicola · elev 20 ft
- X13 — Carrabelle-Thompson
Carrabelle · elev 20 ft
- A51 — Costin
Port St Joe · elev 13 ft
- 2J0 — Wakulla County
Panacea · elev 11 ft
- F95 — Calhoun County
Blountstown · elev 121 ft
- KTLH — Tallahassee International
Tallahassee · elev 83 ft
- 2J9 — Quincy Municipal
Quincy · elev 221 ft
- KECP — Northwest Florida Beaches International
Panama City · elev 69 ft
Frequently asked questions
How high does density altitude get at F47 in summer?
On a typical July afternoon — around 92 °F at the nearest NOAA normals station — density altitude at St George Island reaches roughly 2,083 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 F47 on an average day?
It swings with the seasons: from roughly −323 ft at the coldest month's average temperature to about 1,559 ft at the warmest month's — all from a constant field elevation of 3 ft. The month-by-month table above carries the full year.
What is the field elevation of St George Island?
3 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is F47 (FAA), in Apalachicola, Florida.