Johnson City, Tennessee · field elev 1,550 ft
Density Altitude at Johnson City (0A4)
Johnson City sits at 1,550 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 3,600 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 | 35.9 | 386 ft | 46.2 | 1,085 ft |
| February | 39.2 | 612 ft | 50.4 | 1,365 ft |
| March | 46.6 | 1,112 ft | 58.9 | 1,924 ft |
| April | 55.5 | 1,702 ft | 69.0 | 2,572 ft |
| May | 64.2 | 2,266 ft | 76.6 | 3,050 ft |
| June | 71.2 | 2,712 ft | 82.9 | 3,441 ft |
| July | 74.5 | 2,919 ft | 85.5 | 3,600 ft |
| August | 73.7 | 2,869 ft | 85.0 | 3,569 ft |
| September | 67.9 | 2,502 ft | 80.1 | 3,268 ft |
| October | 57.0 | 1,800 ft | 70.0 | 2,636 ft |
| November | 45.9 | 1,065 ft | 58.5 | 1,898 ft |
| December | 39.2 | 612 ft | 49.5 | 1,306 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 0A4
DENSITY ALTITUDE
Field elevation 1,550 ft — the air behaves like 3,630 ft.
- PRESSURE ALT
- 1,551 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
- 0A9 — William B Greene Jr Regional
Elizabethton · elev 1,593 ft
- KTRI — Tri-Cities
Bristol/Johnson/Kingsport · elev 1,519 ft
- 6A4 — Johnson County
Mountain City · elev 2,241 ft
- KGCY — Greeneville Municipal
Greeneville · elev 1,608 ft
- KRVN — Hawkins County
Rogersville · elev 1,255 ft
- KMOR — Moore-Murrell
Morristown · elev 1,313 ft
- 3A2 — The New Tazewell/Wayne Coffey Municipal
Tazewell · elev 1,179 ft
- KGKT — Gatlinburg-Pigeon Forge
Sevierville · elev 1,014 ft
Frequently asked questions
How high does density altitude get at 0A4 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Johnson City reaches roughly 3,600 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 0A4 on an average day?
It swings with the seasons: from roughly 386 ft at the coldest month's average temperature to about 2,919 ft at the warmest month's — all from a constant field elevation of 1,550 ft. The month-by-month table above carries the full year.
What is the field elevation of Johnson City?
1,550 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 0A4 (FAA), in Johnson City, Tennessee.