St Johns, Arizona · field elev 5,737 ft
Density Altitude at St Johns Industrial Air Park (KSJN)
St Johns Industrial Air Park is a genuine high-and-hot field: from 5,737 ft of elevation, a typical July afternoon (91 °F) pushes density altitude to about 9,008 ft — the airplane performs like it is 3,271 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 34.4 | 5,482 ft | 49.5 | 6,468 ft ▲ |
| February | 38.6 | 5,760 ft | 54.6 | 6,793 ft ▲ |
| March | 45.1 | 6,185 ft | 62.4 | 7,282 ft ▲ |
| April | 52.3 | 6,647 ft | 69.9 | 7,745 ft ▲ |
| May | 61.4 | 7,220 ft | 79.3 | 8,312 ft ⚠ |
| June | 71.5 | 7,842 ft | 89.8 | 8,932 ft ⚠ |
| July | 75.9 | 8,108 ft | 91.1 | 9,008 ft ⚠ |
| August | 73.2 | 7,945 ft | 87.9 | 8,821 ft ⚠ |
| September | 66.6 | 7,542 ft | 83.0 | 8,533 ft ⚠ |
| October | 54.4 | 6,780 ft | 72.2 | 7,885 ft ▲ |
| November | 42.7 | 6,029 ft | 59.6 | 7,108 ft ▲ |
| December | 33.6 | 5,429 ft | 48.8 | 6,423 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 KSJN
DENSITY ALTITUDE high DA
Field elevation 5,737 ft — the air behaves like 9,002 ft.
- PRESSURE ALT
- 5,739 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 Arizona fields
- KJTC — Springerville Municipal
Springerville · elev 7,055 ft
- KSOW — Show Low Regional
Show Low · elev 6,416 ft
- KTYL — Taylor
Taylor · elev 5,823 ft
- P14 — Holbrook Municipal
Holbrook · elev 5,262 ft
- E24 — Whiteriver
Whiteriver · elev 5,153 ft
- Z95 — Cibecue
Cibecue · elev 5,037 ft
- KRQE — Window Rock
Window Rock · elev 6,742 ft
- KINW — Winslow-Lindbergh Regional
Winslow · elev 4,941 ft
Frequently asked questions
How high does density altitude get at KSJN in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at St Johns Industrial Air Park reaches roughly 9,008 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 KSJN on an average day?
It swings with the seasons: from roughly 5,429 ft at the coldest month's average temperature to about 8,108 ft at the warmest month's — all from a constant field elevation of 5,737 ft. The month-by-month table above carries the full year.
What is the field elevation of St Johns Industrial Air Park?
5,737 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSJN (ICAO) / SJN (FAA), in St Johns, Arizona.