Arco, Idaho · field elev 5,335 ft
Density Altitude at Arco-Butte County (KAOC)
Arco-Butte County is a genuine high-and-hot field: from 5,335 ft of elevation, a typical July afternoon (87 °F) pushes density altitude to about 8,259 ft — the airplane performs like it is 2,924 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 | 18.6 | 3,908 ft | 30.3 | 4,709 ft |
| February | 23.2 | 4,226 ft | 34.7 | 5,004 ft ▲ |
| March | 34.4 | 4,984 ft | 45.9 | 5,741 ft ▲ |
| April | 43.8 | 5,605 ft | 57.2 | 6,465 ft ▲ |
| May | 52.8 | 6,186 ft | 67.0 | 7,077 ft ▲ |
| June | 61.0 | 6,704 ft | 76.4 | 7,650 ft ▲ |
| July | 69.1 | 7,206 ft | 86.6 | 8,259 ft ⚠ |
| August | 67.2 | 7,089 ft | 84.8 | 8,153 ft ⚠ |
| September | 57.9 | 6,509 ft | 74.9 | 7,560 ft ▲ |
| October | 45.0 | 5,683 ft | 59.5 | 6,610 ft ▲ |
| November | 30.8 | 4,743 ft | 42.6 | 5,526 ft ▲ |
| December | 20.3 | 4,026 ft | 31.2 | 4,770 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 KAOC
DENSITY ALTITUDE high DA
Field elevation 5,335 ft — the air behaves like 8,283 ft.
- PRESSURE ALT
- 5,337 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- 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
- U92 — Antelope Valley
Moore · elev 6,193 ft
- U46 — Big Southern Butte
Atomic City · elev 5,073 ft
- U97 — Howe
Howe · elev 4,930 ft
- 0U7 — Hollow Top
Carey · elev 5,359 ft
- U62 — Mackay
Mackay · elev 5,892 ft
- U48 — Coxs Well
Atomic City · elev 5,048 ft
- U37 — Midway
Atomic City · elev 5,017 ft
- 0U2 — Copper Basin
Mackay · elev 7,920 ft
Frequently asked questions
How high does density altitude get at KAOC in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Arco-Butte County reaches roughly 8,259 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 KAOC on an average day?
It swings with the seasons: from roughly 3,908 ft at the coldest month's average temperature to about 7,206 ft at the warmest month's — all from a constant field elevation of 5,335 ft. The month-by-month table above carries the full year.
What is the field elevation of Arco-Butte County?
5,335 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KAOC (ICAO) / AOC (FAA), in Arco, Idaho.