Nashville, Tennessee · field elev 501 ft
Density Altitude at John C Tune (KJWN)
John C Tune sits at 501 ft, and even a typical July afternoon (89 °F) only lifts density altitude to about 2,555 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 | 37.8 | −790 ft | 48.0 | −94 ft |
| February | 41.7 | −522 ft | 52.2 | 187 ft |
| March | 50.2 | 54 ft | 61.9 | 826 ft |
| April | 59.7 | 683 ft | 72.0 | 1,476 ft |
| May | 67.8 | 1,208 ft | 79.9 | 1,974 ft |
| June | 75.3 | 1,685 ft | 86.7 | 2,395 ft |
| July | 78.6 | 1,893 ft | 89.3 | 2,555 ft |
| August | 77.8 | 1,843 ft | 88.6 | 2,512 ft |
| September | 71.5 | 1,444 ft | 83.6 | 2,204 ft |
| October | 60.2 | 715 ft | 73.2 | 1,552 ft |
| November | 49.1 | −20 ft | 61.6 | 807 ft |
| December | 41.4 | −542 ft | 51.1 | 114 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 KJWN
DENSITY ALTITUDE
Field elevation 501 ft — the air behaves like 2,537 ft.
- PRESSURE ALT
- 502 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
- KBNA — Nashville International
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- KMQY — Smyrna
Smyrna · elev 543 ft
- M91 — Springfield Robertson County
Springfield · elev 706 ft
- KXNX — Music City Exec
Gallatin · elev 583 ft
- M02 — Dickson Municipal
Dickson · elev 892 ft
- M54 — Lebanon Municipal
Lebanon · elev 588 ft
- KMBT — Murfreesboro Municipal
Murfreesboro · elev 614 ft
- 1M5 — Douglas Hunter Field
Portland · elev 818 ft
Frequently asked questions
How high does density altitude get at KJWN in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at John C Tune reaches roughly 2,555 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 KJWN on an average day?
It swings with the seasons: from roughly −790 ft at the coldest month's average temperature to about 1,893 ft at the warmest month's — all from a constant field elevation of 501 ft. The month-by-month table above carries the full year.
What is the field elevation of John C Tune?
501 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KJWN (ICAO) / JWN (FAA), in Nashville, Tennessee.