Prestonsburg, Kentucky · field elev 1,222 ft
Density Altitude at Big Sandy Regional (KSJS)
Big Sandy Regional sits at 1,222 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 3,115 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 | 34.2 | −140 ft | 42.9 | 456 ft |
| February | 37.3 | 74 ft | 46.5 | 699 ft |
| March | 45.0 | 598 ft | 55.7 | 1,310 ft |
| April | 56.1 | 1,336 ft | 67.9 | 2,100 ft |
| May | 63.7 | 1,830 ft | 74.5 | 2,518 ft |
| June | 71.0 | 2,297 ft | 81.1 | 2,929 ft |
| July | 74.4 | 2,512 ft | 84.1 | 3,115 ft |
| August | 73.1 | 2,430 ft | 83.1 | 3,053 ft |
| September | 67.0 | 2,042 ft | 77.5 | 2,706 ft |
| October | 55.8 | 1,317 ft | 66.4 | 2,004 ft |
| November | 45.9 | 659 ft | 55.8 | 1,317 ft |
| December | 38.1 | 129 ft | 46.3 | 685 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 KSJS
DENSITY ALTITUDE
Field elevation 1,222 ft — the air behaves like 3,108 ft.
- PRESSURE ALT
- 1,223 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 Kentucky fields
- KPBX — Pike County/Hatcher Field
Pikeville · elev 1,465 ft
- 9I3 — West Liberty
West Liberty · elev 934 ft
- KJKL — Julian Carroll
Jackson · elev 1,381 ft
- KCPF — Wendell H Ford
Hazard · elev 1,257 ft
- KDWU — Ashland Regional
Ashland · elev 547 ft
- KSYM — Morehead-Rowan County Clyde A Thomas Regional
Morehead · elev 1,028 ft
- I50 — Stanton
Stanton · elev 651 ft
- I35 — Tucker-Guthrie Meml
Harlan · elev 1,564 ft
Frequently asked questions
How high does density altitude get at KSJS in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Big Sandy Regional reaches roughly 3,115 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 KSJS on an average day?
It swings with the seasons: from roughly −140 ft at the coldest month's average temperature to about 2,512 ft at the warmest month's — all from a constant field elevation of 1,222 ft. The month-by-month table above carries the full year.
What is the field elevation of Big Sandy Regional?
1,222 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSJS (ICAO) / SJS (FAA), in Prestonsburg, Kentucky.