Trenton, Tennessee · field elev 358 ft
Density Altitude at Gibson County (KTGC)
Gibson County sits at 358 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,436 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 | 37.9 | −961 ft | 48.1 | −265 ft |
| February | 41.8 | −693 ft | 52.6 | 37 ft |
| March | 50.2 | −124 ft | 61.8 | 643 ft |
| April | 59.8 | 513 ft | 72.1 | 1,307 ft |
| May | 68.9 | 1,103 ft | 80.1 | 1,812 ft |
| June | 76.7 | 1,598 ft | 87.4 | 2,264 ft |
| July | 79.9 | 1,799 ft | 90.2 | 2,436 ft |
| August | 78.4 | 1,705 ft | 90.0 | 2,424 ft |
| September | 71.7 | 1,282 ft | 84.2 | 2,067 ft |
| October | 60.4 | 552 ft | 73.7 | 1,409 ft |
| November | 49.1 | −198 ft | 61.1 | 598 ft |
| December | 41.1 | −741 ft | 51.2 | −57 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 KTGC
DENSITY ALTITUDE
Field elevation 358 ft — the air behaves like 2,424 ft.
- PRESSURE ALT
- 359 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 Tennessee fields
- M53 — Humboldt Municipal
Humboldt · elev 421 ft
- KMKL — Jackson Regional
Jackson · elev 435 ft
- KHZD — Sgt Lee Russell Carroll County
Huntingdon · elev 497 ft
- KDYR — Dyersburg Regional
Dyersburg · elev 338 ft
- KUCY — Everett-Stewart Regional
Union City · elev 346 ft
- KPHT — Henry County
Paris · elev 580 ft
- 0M4 — Benton County
Camden · elev 468 ft
- KPVE — Beech River Regional
Lexington-Parsons · elev 488 ft
Frequently asked questions
How high does density altitude get at KTGC in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Gibson County reaches roughly 2,436 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 KTGC on an average day?
It swings with the seasons: from roughly −961 ft at the coldest month's average temperature to about 1,799 ft at the warmest month's — all from a constant field elevation of 358 ft. The month-by-month table above carries the full year.
What is the field elevation of Gibson County?
358 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTGC (ICAO) / TGC (FAA), in Trenton, Tennessee.