Big Creek Ranger Station, Idaho · field elev 4,289 ft
Density Altitude at Cabin Creek Usfs (I08)
From a field elevation of 4,289 ft, a typical July afternoon at Cabin Creek Usfs (88 °F) raises density altitude to about 7,094 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 | 23.6 | 2,950 ft | 30.9 | 3,451 ft |
| February | 28.9 | 3,315 ft | 38.4 | 3,956 ft |
| March | 38.2 | 3,943 ft | 49.8 | 4,706 ft |
| April | 45.8 | 4,446 ft | 58.7 | 5,278 ft ▲ |
| May | 53.9 | 4,971 ft | 68.1 | 5,868 ft ▲ |
| June | 60.9 | 5,417 ft | 76.4 | 6,379 ft ▲ |
| July | 69.7 | 5,967 ft | 88.3 | 7,094 ft ▲ |
| August | 68.4 | 5,887 ft | 87.2 | 7,029 ft ▲ |
| September | 58.7 | 5,278 ft | 75.9 | 6,348 ft ▲ |
| October | 45.5 | 4,426 ft | 58.0 | 5,233 ft ▲ |
| November | 32.7 | 3,573 ft | 40.6 | 4,103 ft |
| December | 23.5 | 2,943 ft | 30.2 | 3,404 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 I08
DENSITY ALTITUDE caution
Field elevation 4,289 ft — the air behaves like 7,076 ft.
- PRESSURE ALT
- 4,291 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
- 85U — Soldier Bar Usfs
Soldier Bar · elev 4,190 ft
- U81 — Cold Meadows Usfs
Cold Meadows Guard Station · elev 7,030 ft
- U54 — Bernard Usfs
Bernard · elev 3,626 ft
- 4D2 — Hoodoo Meadows
Salmon · elev 8,262 ft
- U60 — Big Creek
Big Creek · elev 5,743 ft
- U79 — Chamberlain Usfs
Chamberlain Guard Station · elev 5,765 ft
- C53 — Lower Loon Creek
Challis · elev 4,200 ft
- ID8 — Marble Creek
Challis · elev 4,685 ft
Frequently asked questions
How high does density altitude get at I08 in summer?
On a typical July afternoon — around 88 °F at the nearest NOAA normals station — density altitude at Cabin Creek Usfs reaches roughly 7,094 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 I08 on an average day?
It swings with the seasons: from roughly 2,943 ft at the coldest month's average temperature to about 5,967 ft at the warmest month's — all from a constant field elevation of 4,289 ft. The month-by-month table above carries the full year.
What is the field elevation of Cabin Creek Usfs?
4,289 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is I08 (FAA), in Big Creek Ranger Station, Idaho.