Coolin, Idaho · field elev 2,484 ft
Density Altitude at Cavanaugh Bay (66S)
Cavanaugh Bay sits at 2,484 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 4,596 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 | 26.9 | 927 ft | 31.8 | 1,267 ft |
| February | 29.4 | 1,101 ft | 36.8 | 1,610 ft |
| March | 36.3 | 1,576 ft | 46.1 | 2,235 ft |
| April | 44.0 | 2,095 ft | 56.7 | 2,931 ft |
| May | 53.3 | 2,710 ft | 67.9 | 3,648 ft |
| June | 58.9 | 3,073 ft | 73.5 | 3,999 ft |
| July | 65.4 | 3,489 ft | 83.2 | 4,596 ft |
| August | 64.3 | 3,419 ft | 82.9 | 4,578 ft |
| September | 55.5 | 2,853 ft | 71.9 | 3,899 ft |
| October | 43.1 | 2,035 ft | 54.0 | 2,756 ft |
| November | 32.7 | 1,329 ft | 38.4 | 1,718 ft |
| December | 26.5 | 900 ft | 30.9 | 1,205 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 66S
DENSITY ALTITUDE
Field elevation 2,484 ft — the air behaves like 4,584 ft.
- PRESSURE ALT
- 2,486 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
- 67S — Priest Lake Usfs
Nordman · elev 2,611 ft
- KSZT — Sandpoint
Sandpoint · elev 2,131 ft
- 1S6 — Priest River
Priest River · elev 2,193 ft
- 65S — Boundary County
Bonners Ferry · elev 2,337 ft
- 1S1 — Eckhart International
Porthill · elev 1,758 ft
- KCOE — Coeur D'Alene
Coeur D'Alene · elev 2,320 ft
- S77 — Magee
Coeur D'Alene · elev 3,002 ft
- S83 — Shoshone County
Kellogg · elev 2,227 ft
Frequently asked questions
How high does density altitude get at 66S in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Cavanaugh Bay reaches roughly 4,596 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 66S on an average day?
It swings with the seasons: from roughly 900 ft at the coldest month's average temperature to about 3,489 ft at the warmest month's — all from a constant field elevation of 2,484 ft. The month-by-month table above carries the full year.
What is the field elevation of Cavanaugh Bay?
2,484 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 66S (FAA), in Coolin, Idaho.