St Augustine, Florida · field elev 10 ft
Density Altitude at St Augustine (KSGJ)
St Augustine sits at 10 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,061 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 | 57.6 | −62 ft | 67.5 | 585 ft |
| February | 60.0 | 96 ft | 69.7 | 726 ft |
| March | 64.5 | 390 ft | 74.4 | 1,026 ft |
| April | 70.2 | 758 ft | 79.8 | 1,367 ft |
| May | 76.3 | 1,147 ft | 85.1 | 1,698 ft |
| June | 80.4 | 1,405 ft | 88.6 | 1,914 ft |
| July | 82.4 | 1,530 ft | 91.0 | 2,061 ft |
| August | 82.1 | 1,511 ft | 89.9 | 1,994 ft |
| September | 80.3 | 1,399 ft | 87.4 | 1,840 ft |
| October | 74.2 | 1,014 ft | 81.8 | 1,492 ft |
| November | 66.2 | 501 ft | 74.9 | 1,058 ft |
| December | 60.1 | 103 ft | 68.9 | 675 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 KSGJ
DENSITY ALTITUDE
Field elevation 10 ft — the air behaves like 2,061 ft.
- PRESSURE ALT
- 11 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
- KCRG — Jacksonville Exec At Craig
Jacksonville · elev 41 ft
- 28J — Palatka Municipal/Lt Kay Larkin Field
Palatka · elev 48 ft
- KFIN — Flagler Exec
Palm Coast · elev 33 ft
- KHEG — Herlong Recreational
Jacksonville · elev 86 ft
- KVQQ — Cecil
Jacksonville · elev 80 ft
- KJAX — Jacksonville International
Jacksonville · elev 30 ft
- 42J — Keystone Heights
Keystone Heights · elev 196 ft
- KFHB — Fernandina Beach Municipal
Fernandina Beach · elev 16 ft
Frequently asked questions
How high does density altitude get at KSGJ in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at St Augustine reaches roughly 2,061 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 KSGJ on an average day?
It swings with the seasons: from roughly −62 ft at the coldest month's average temperature to about 1,530 ft at the warmest month's — all from a constant field elevation of 10 ft. The month-by-month table above carries the full year.
What is the field elevation of St Augustine?
10 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSGJ (ICAO) / SGJ (FAA), in St Augustine, Florida.