Slate Creek, Idaho · field elev 1,660 ft
Density Altitude at Slate Creek (1S7)
Slate Creek sits at 1,660 ft, and even a typical August afternoon (90 °F) only lifts density altitude to about 4,007 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 | 32.6 | 295 ft | 40.5 | 837 ft |
| February | 35.9 | 523 ft | 46.1 | 1,215 ft |
| March | 42.6 | 979 ft | 54.9 | 1,798 ft |
| April | 48.4 | 1,369 ft | 62.1 | 2,266 ft |
| May | 55.9 | 1,864 ft | 70.7 | 2,815 ft |
| June | 62.3 | 2,279 ft | 77.7 | 3,253 ft |
| July | 71.1 | 2,840 ft | 89.8 | 3,995 ft |
| August | 71.0 | 2,834 ft | 90.0 | 4,007 ft |
| September | 62.4 | 2,285 ft | 79.5 | 3,365 ft |
| October | 49.9 | 1,468 ft | 63.5 | 2,356 ft |
| November | 38.7 | 715 ft | 48.3 | 1,362 ft |
| December | 32.0 | 254 ft | 39.6 | 776 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 1S7
DENSITY ALTITUDE
Field elevation 1,660 ft — the air behaves like 4,007 ft.
- PRESSURE ALT
- 1,661 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
- 1DA — Big Bar Usfs
Lucile · elev 1,236 ft
- KGIC — Idaho County
Grangeville · elev 3,313 ft
- S84 — Cottonwood Municipal
Cottonwood · elev 3,474 ft
- I45 — Wapshilla
Winchester · elev 1,415 ft
- S82 — Kooskia Municipal
Kooskia · elev 1,263 ft
- 75C — Orogrande
Orogrande · elev 4,419 ft
- 0S5 — Nezperce Municipal
Nezperce · elev 3,204 ft
- A05 — Dixie Usfs
Dixie · elev 5,148 ft
Frequently asked questions
How high does density altitude get at 1S7 in summer?
On a typical August afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Slate Creek reaches roughly 4,007 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 1S7 on an average day?
It swings with the seasons: from roughly 254 ft at the coldest month's average temperature to about 2,840 ft at the warmest month's — all from a constant field elevation of 1,660 ft. The month-by-month table above carries the full year.
What is the field elevation of Slate Creek?
1,660 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1S7 (FAA), in Slate Creek, Idaho.