Jekyll Island, Georgia · field elev 11 ft
Density Altitude at Jekyll Island (09J)
Jekyll Island sits at 11 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,062 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 | 53.0 | −366 ft | 61.8 | 216 ft |
| February | 56.1 | −160 ft | 64.8 | 411 ft |
| March | 61.7 | 209 ft | 70.4 | 772 ft |
| April | 68.0 | 618 ft | 76.3 | 1,148 ft |
| May | 75.6 | 1,104 ft | 83.3 | 1,587 ft |
| June | 81.0 | 1,444 ft | 88.2 | 1,890 ft |
| July | 83.6 | 1,606 ft | 91.0 | 2,062 ft |
| August | 82.8 | 1,556 ft | 89.6 | 1,976 ft |
| September | 79.1 | 1,325 ft | 85.8 | 1,742 ft |
| October | 71.3 | 830 ft | 79.0 | 1,318 ft |
| November | 62.0 | 229 ft | 70.7 | 792 ft |
| December | 55.7 | −186 ft | 64.3 | 379 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 09J
DENSITY ALTITUDE
Field elevation 11 ft — the air behaves like 2,062 ft.
- PRESSURE ALT
- 12 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 Georgia fields
- KSSI — St Simons Island
St Simons Island · elev 19 ft
- KBQK — Brunswick Golden Isles
Brunswick · elev 26 ft
- 4J1 — Brantley County
Nahunta · elev 85 ft
- 3J6 — Davis Field
Folkston · elev 68 ft
- KJES — Jesup-Wayne County
Jesup · elev 108 ft
- KLHW — Wright Aaf (Fort Stewart)/Midcoast Regional
Fort Stewart (Hinesville) · elev 47 ft
- KAYS — Waycross-Ware County
Waycross · elev 141 ft
- KAMG — Bacon County
Alma · elev 200 ft
Frequently asked questions
How high does density altitude get at 09J in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Jekyll Island reaches roughly 2,062 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 09J on an average day?
It swings with the seasons: from roughly −366 ft at the coldest month's average temperature to about 1,606 ft at the warmest month's — all from a constant field elevation of 11 ft. The month-by-month table above carries the full year.
What is the field elevation of Jekyll Island?
11 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 09J (FAA), in Jekyll Island, Georgia.