Coeur D'Alene, Idaho · field elev 3,002 ft
Density Altitude at Magee (S77)
From a field elevation of 3,002 ft, a typical August afternoon at Magee (84 °F) raises density altitude to about 5,269 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 | 27.2 | 1,595 ft | 32.9 | 1,988 ft |
| February | 29.4 | 1,747 ft | 37.0 | 2,267 ft |
| March | 35.2 | 2,144 ft | 45.0 | 2,803 ft |
| April | 42.9 | 2,663 ft | 55.7 | 3,504 ft |
| May | 51.4 | 3,224 ft | 67.0 | 4,225 ft |
| June | 57.5 | 3,620 ft | 72.7 | 4,582 ft |
| July | 63.7 | 4,017 ft | 83.0 | 5,214 ft ▲ |
| August | 63.4 | 3,998 ft | 83.9 | 5,269 ft ▲ |
| September | 54.7 | 3,439 ft | 72.5 | 4,569 ft |
| October | 43.4 | 2,696 ft | 54.8 | 3,446 ft |
| November | 33.3 | 2,015 ft | 39.4 | 2,429 ft |
| December | 26.7 | 1,560 ft | 31.6 | 1,898 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 S77
DENSITY ALTITUDE caution
Field elevation 3,002 ft — the air behaves like 5,275 ft.
- PRESSURE ALT
- 3,004 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
- S83 — Shoshone County
Kellogg · elev 2,227 ft
- KCOE — Coeur D'Alene
Coeur D'Alene · elev 2,320 ft
- KSZT — Sandpoint
Sandpoint · elev 2,131 ft
- S72 — Jack A Buell
St Maries · elev 2,131 ft
- 1S6 — Priest River
Priest River · elev 2,193 ft
- 66S — Cavanaugh Bay
Coolin · elev 2,484 ft
- 67S — Priest Lake Usfs
Nordman · elev 2,611 ft
- 65S — Boundary County
Bonners Ferry · elev 2,337 ft
Frequently asked questions
How high does density altitude get at S77 in summer?
On a typical August afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Magee reaches roughly 5,269 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 S77 on an average day?
It swings with the seasons: from roughly 1,560 ft at the coldest month's average temperature to about 4,017 ft at the warmest month's — all from a constant field elevation of 3,002 ft. The month-by-month table above carries the full year.
What is the field elevation of Magee?
3,002 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is S77 (FAA), in Coeur D'Alene, Idaho.