Elk City, Idaho · field elev 4,097 ft
Density Altitude at Elk City (S90)
From a field elevation of 4,097 ft, a typical August afternoon at Elk City (83 °F) raises density altitude to about 6,539 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 24.9 | 2,801 ft | 35.1 | 3,497 ft |
| February | 28.2 | 3,028 ft | 40.8 | 3,878 ft |
| March | 34.1 | 3,430 ft | 47.2 | 4,300 ft |
| April | 40.2 | 3,839 ft | 53.3 | 4,696 ft |
| May | 47.9 | 4,346 ft | 63.0 | 5,314 ft ▲ |
| June | 55.4 | 4,831 ft | 70.5 | 5,782 ft ▲ |
| July | 62.5 | 5,283 ft | 82.6 | 6,521 ft ▲ |
| August | 61.0 | 5,188 ft | 82.9 | 6,539 ft ▲ |
| September | 53.2 | 4,690 ft | 74.1 | 6,004 ft ▲ |
| October | 43.4 | 4,051 ft | 58.3 | 5,017 ft ▲ |
| November | 32.1 | 3,294 ft | 42.8 | 4,011 ft |
| December | 23.6 | 2,711 ft | 33.3 | 3,376 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 S90
DENSITY ALTITUDE caution
Field elevation 4,097 ft — the air behaves like 6,545 ft.
- PRESSURE ALT
- 4,099 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 Idaho fields
- 75C — Orogrande
Orogrande · elev 4,419 ft
- A05 — Dixie Usfs
Dixie · elev 5,148 ft
- C48 — Wilson Bar Usfs
Dixie · elev 2,275 ft
- 2U5 — Shearer /Usfs/
Shearer · elev 2,634 ft
- 1U1 — Moose Creek /Usfs/
Moose Creek Ranger Station · elev 2,454 ft
- U79 — Chamberlain Usfs
Chamberlain Guard Station · elev 5,765 ft
- S82 — Kooskia Municipal
Kooskia · elev 1,263 ft
- KGIC — Idaho County
Grangeville · elev 3,313 ft
Frequently asked questions
How high does density altitude get at S90 in summer?
On a typical August afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Elk City reaches roughly 6,539 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 S90 on an average day?
It swings with the seasons: from roughly 2,711 ft at the coldest month's average temperature to about 5,283 ft at the warmest month's — all from a constant field elevation of 4,097 ft. The month-by-month table above carries the full year.
What is the field elevation of Elk City?
4,097 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is S90 (FAA), in Elk City, Idaho.