Franklin, Indiana · field elev 740 ft
Density Altitude at Franklin Flying Field (3FK)
Franklin Flying Field sits at 740 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,533 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 | 26.6 | −1,275 ft | 35.4 | −658 ft |
| February | 29.8 | −1,049 ft | 39.8 | −354 ft |
| March | 39.9 | −348 ft | 50.5 | 370 ft |
| April | 51.1 | 410 ft | 62.5 | 1,160 ft |
| May | 61.7 | 1,108 ft | 72.6 | 1,807 ft |
| June | 71.1 | 1,712 ft | 81.4 | 2,360 ft |
| July | 74.0 | 1,896 ft | 84.2 | 2,533 ft |
| August | 72.0 | 1,769 ft | 83.0 | 2,459 ft |
| September | 66.0 | 1,386 ft | 78.2 | 2,160 ft |
| October | 53.5 | 569 ft | 65.7 | 1,367 ft |
| November | 41.5 | −238 ft | 51.6 | 443 ft |
| December | 31.8 | −908 ft | 40.1 | −334 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 3FK
DENSITY ALTITUDE
Field elevation 740 ft — the air behaves like 2,521 ft.
- PRESSURE ALT
- 741 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 Indiana fields
- KHFY — Indy South Greenwood
Indianapolis · elev 822 ft
- KBAK — Columbus Municipal
Columbus · elev 656 ft
- KGEZ — Shelbyville Municipal
Shelbyville · elev 803 ft
- 7L8 — Post-Air
Indianapolis · elev 861 ft
- KIND — Indianapolis International
Indianapolis · elev 796 ft
- I34 — Greensburg Municipal
Greensburg · elev 909 ft
- KMQJ — Indianapolis Regional
Indianapolis · elev 862 ft
- KGFD — Pope Field
Greenfield · elev 895 ft
Frequently asked questions
How high does density altitude get at 3FK in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Franklin Flying Field reaches roughly 2,533 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 3FK on an average day?
It swings with the seasons: from roughly −1,275 ft at the coldest month's average temperature to about 1,896 ft at the warmest month's — all from a constant field elevation of 740 ft. The month-by-month table above carries the full year.
What is the field elevation of Franklin Flying Field?
740 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3FK (FAA), in Franklin, Indiana.