Selmer, Tennessee · field elev 610 ft
Density Altitude at Robert Sibley (KSZY)
Robert Sibley sits at 610 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,749 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 | 39.3 | −551 ft | 49.1 | 115 ft |
| February | 43.1 | −291 ft | 53.7 | 422 ft |
| March | 51.4 | 269 ft | 62.8 | 1,019 ft |
| April | 60.4 | 863 ft | 72.7 | 1,654 ft |
| May | 68.9 | 1,412 ft | 80.3 | 2,132 ft |
| June | 76.5 | 1,894 ft | 87.4 | 2,571 ft |
| July | 79.8 | 2,101 ft | 90.3 | 2,749 ft |
| August | 78.8 | 2,039 ft | 89.7 | 2,712 ft |
| September | 72.6 | 1,648 ft | 84.3 | 2,380 ft |
| October | 61.1 | 908 ft | 73.8 | 1,724 ft |
| November | 50.1 | 182 ft | 61.8 | 954 ft |
| December | 42.2 | −352 ft | 51.9 | 302 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 KSZY
DENSITY ALTITUDE
Field elevation 610 ft — the air behaves like 2,730 ft.
- PRESSURE ALT
- 611 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
- KSNH — Savannah-Hardin County
Savannah · elev 473 ft
- M08 — William L Whitehurst Field
Bolivar · elev 499 ft
- M29 — Hassell Field
Clifton · elev 407 ft
- KPVE — Beech River Regional
Lexington-Parsons · elev 488 ft
- KMKL — Jackson Regional
Jackson · elev 435 ft
- M15 — James Tucker
Linden · elev 740 ft
- M53 — Humboldt Municipal
Humboldt · elev 421 ft
- KFYE — Fayette County
Somerville · elev 436 ft
Frequently asked questions
How high does density altitude get at KSZY in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Robert Sibley reaches roughly 2,749 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 KSZY on an average day?
It swings with the seasons: from roughly −551 ft at the coldest month's average temperature to about 2,101 ft at the warmest month's — all from a constant field elevation of 610 ft. The month-by-month table above carries the full year.
What is the field elevation of Robert Sibley?
610 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSZY (ICAO) / SZY (FAA), in Selmer, Tennessee.