Gainesboro, Tennessee · field elev 517 ft
Density Altitude at Jackson County (1A7)
Jackson County sits at 517 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,611 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 | 35.4 | −936 ft | 47.3 | −122 ft |
| February | 40.0 | −618 ft | 53.3 | 280 ft |
| March | 47.7 | −95 ft | 62.1 | 859 ft |
| April | 57.1 | 532 ft | 72.7 | 1,540 ft |
| May | 66.1 | 1,118 ft | 80.5 | 2,031 ft |
| June | 73.8 | 1,610 ft | 87.3 | 2,452 ft |
| July | 77.4 | 1,837 ft | 89.9 | 2,611 ft |
| August | 76.4 | 1,774 ft | 89.5 | 2,587 ft |
| September | 69.8 | 1,356 ft | 83.8 | 2,236 ft |
| October | 58.4 | 617 ft | 73.6 | 1,597 ft |
| November | 46.9 | −149 ft | 61.1 | 794 ft |
| December | 38.9 | −694 ft | 51.3 | 147 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 1A7
DENSITY ALTITUDE
Field elevation 517 ft — the air behaves like 2,617 ft.
- PRESSURE ALT
- 518 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
- 8A3 — Livingston Municipal
Livingston · elev 1,372 ft
- KSRB — Upper Cumberland Regional
Sparta · elev 1,025 ft
- 3M7 — Lafayette Municipal
Lafayette · elev 969 ft
- 0A3 — Smithville Municipal
Smithville · elev 1,084 ft
- 2A1 — Jamestown Municipal
Jamestown · elev 1,694 ft
- M54 — Lebanon Municipal
Lebanon · elev 588 ft
- KXNX — Music City Exec
Gallatin · elev 583 ft
- KCSV — Crossville Meml-Whitson Field
Crossville · elev 1,882 ft
Frequently asked questions
How high does density altitude get at 1A7 in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Jackson County reaches roughly 2,611 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 1A7 on an average day?
It swings with the seasons: from roughly −936 ft at the coldest month's average temperature to about 1,837 ft at the warmest month's — all from a constant field elevation of 517 ft. The month-by-month table above carries the full year.
What is the field elevation of Jackson County?
517 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1A7 (FAA), in Gainesboro, Tennessee.