Challis, Idaho · field elev 4,685 ft
Density Altitude at Marble Creek (ID8)
From a field elevation of 4,685 ft, a typical July afternoon at Marble Creek (86 °F) raises density altitude to about 7,419 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 | 25.0 | 3,540 ft | 34.1 | 4,159 ft |
| February | 29.2 | 3,828 ft | 40.4 | 4,579 ft |
| March | 37.4 | 4,380 ft | 49.8 | 5,194 ft ▲ |
| April | 44.0 | 4,816 ft | 57.3 | 5,674 ft ▲ |
| May | 52.4 | 5,361 ft | 66.6 | 6,259 ft ▲ |
| June | 59.5 | 5,814 ft | 75.0 | 6,775 ft ▲ |
| July | 67.1 | 6,290 ft | 85.7 | 7,419 ft ▲ |
| August | 65.6 | 6,196 ft | 85.0 | 7,377 ft ▲ |
| September | 57.5 | 5,687 ft | 75.9 | 6,830 ft ▲ |
| October | 45.8 | 4,934 ft | 60.7 | 5,889 ft ▲ |
| November | 33.1 | 4,092 ft | 43.0 | 4,751 ft |
| December | 24.2 | 3,485 ft | 33.3 | 4,105 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 ID8
DENSITY ALTITUDE caution
Field elevation 4,685 ft — the air behaves like 7,437 ft.
- PRESSURE ALT
- 4,687 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
- 2U8 — Thomas Creek
Stanley · elev 4,415 ft
- 0U3 — Mahoney Creek Usfs
Mahoney Creek · elev 4,618 ft
- D47 — Cougar Ranch
Challis · elev 4,277 ft
- S81 — Indian Creek Usfs
Indian Creek · elev 4,718 ft
- C53 — Lower Loon Creek
Challis · elev 4,200 ft
- U72 — Upper Loon Creek Usfs
Challis · elev 5,500 ft
- U54 — Bernard Usfs
Bernard · elev 3,626 ft
- 85U — Soldier Bar Usfs
Soldier Bar · elev 4,190 ft
Frequently asked questions
How high does density altitude get at ID8 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Marble Creek reaches roughly 7,419 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 ID8 on an average day?
It swings with the seasons: from roughly 3,485 ft at the coldest month's average temperature to about 6,290 ft at the warmest month's — all from a constant field elevation of 4,685 ft. The month-by-month table above carries the full year.
What is the field elevation of Marble Creek?
4,685 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is ID8 (FAA), in Challis, Idaho.