St Simons Island, Georgia · field elev 19 ft
Density Altitude at St Simons Island (KSSI)
St Simons Island sits at 19 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,072 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 | −356 ft | 61.8 | 225 ft |
| February | 56.1 | −150 ft | 64.8 | 421 ft |
| March | 61.7 | 219 ft | 70.4 | 782 ft |
| April | 68.0 | 628 ft | 76.3 | 1,158 ft |
| May | 75.6 | 1,114 ft | 83.3 | 1,597 ft |
| June | 81.0 | 1,453 ft | 88.2 | 1,900 ft |
| July | 83.6 | 1,616 ft | 91.0 | 2,072 ft |
| August | 82.8 | 1,566 ft | 89.6 | 1,986 ft |
| September | 79.1 | 1,334 ft | 85.8 | 1,752 ft |
| October | 71.3 | 840 ft | 79.0 | 1,328 ft |
| November | 62.0 | 238 ft | 70.7 | 801 ft |
| December | 55.7 | −176 ft | 64.3 | 388 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 KSSI
DENSITY ALTITUDE
Field elevation 19 ft — the air behaves like 2,072 ft.
- PRESSURE ALT
- 20 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
- 09J — Jekyll Island
Jekyll Island · elev 11 ft
- KBQK — Brunswick Golden Isles
Brunswick · elev 26 ft
- 4J1 — Brantley County
Nahunta · elev 85 ft
- KJES — Jesup-Wayne County
Jesup · elev 108 ft
- 3J6 — Davis Field
Folkston · elev 68 ft
- KLHW — Wright Aaf (Fort Stewart)/Midcoast Regional
Fort Stewart (Hinesville) · elev 47 ft
- KAYS — Waycross-Ware County
Waycross · elev 141 ft
- KSAV — Savannah/Hilton Head International
Savannah · elev 50 ft
Frequently asked questions
How high does density altitude get at KSSI in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at St Simons Island reaches roughly 2,072 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 KSSI on an average day?
It swings with the seasons: from roughly −356 ft at the coldest month's average temperature to about 1,616 ft at the warmest month's — all from a constant field elevation of 19 ft. The month-by-month table above carries the full year.
What is the field elevation of St Simons Island?
19 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSSI (ICAO) / SSI (FAA), in St Simons Island, Georgia.