Cooper Landing, Alaska · field elev 466 ft
Density Altitude at Quartz Creek (JLA)
Quartz Creek sits at 466 ft, and even a typical July afternoon (65 °F) only lifts density altitude to about 978 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 | 21.3 | −1,997 ft | 27.7 | −1,540 ft |
| February | 24.8 | −1,746 ft | 32.2 | −1,223 ft |
| March | 27.3 | −1,568 ft | 36.1 | −951 ft |
| April | 36.6 | −916 ft | 46.0 | −273 ft |
| May | 45.0 | −340 ft | 55.0 | 330 ft |
| June | 52.8 | 184 ft | 62.5 | 822 ft |
| July | 56.2 | 409 ft | 64.9 | 978 ft |
| August | 55.8 | 383 ft | 64.5 | 952 ft |
| September | 47.5 | −171 ft | 55.1 | 336 ft |
| October | 38.4 | −792 ft | 45.4 | −313 ft |
| November | 29.5 | −1,413 ft | 36.0 | −958 ft |
| December | 25.4 | −1,703 ft | 31.5 | −1,272 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 JLA
DENSITY ALTITUDE
Field elevation 466 ft — the air behaves like 984 ft.
- PRESSURE ALT
- 467 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 Alaska fields
- 9Z9 — Lawing
Lawing · elev 484 ft
- PAWD — Seward
Seward · elev 28 ft
- 5HO — Hope
Hope · elev 194 ft
- AQY — Girdwood
Girdwood · elev 164 ft
- PAWR — Whittier
Whittier · elev 39 ft
- PASX — Soldotna
Soldotna · elev 113 ft
- PANC — Ted Stevens Anchorage International
Anchorage · elev 151 ft
- PALH — Lake Hood
Anchorage · elev 79 ft
Frequently asked questions
How high does density altitude get at JLA in summer?
On a typical July afternoon — around 65 °F at the nearest NOAA normals station — density altitude at Quartz Creek reaches roughly 978 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 JLA on an average day?
It swings with the seasons: from roughly −1,997 ft at the coldest month's average temperature to about 409 ft at the warmest month's — all from a constant field elevation of 466 ft. The month-by-month table above carries the full year.
What is the field elevation of Quartz Creek?
466 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is JLA (FAA), in Cooper Landing, Alaska.