Old Harbor, Alaska · field elev 55 ft
Density Altitude at Old Harbor (6R7)
Old Harbor sits at 55 ft, and even a typical August afternoon (63 °F) only lifts density altitude to about 335 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 | 31.2 | −1,807 ft | 36.1 | −1,464 ft |
| February | 32.4 | −1,722 ft | 37.5 | −1,366 ft |
| March | 33.2 | −1,666 ft | 38.8 | −1,276 ft |
| April | 39.1 | −1,256 ft | 44.7 | −872 ft |
| May | 45.8 | −797 ft | 51.7 | −399 ft |
| June | 51.4 | −419 ft | 57.0 | −46 ft |
| July | 56.2 | −99 ft | 61.8 | 270 ft |
| August | 56.5 | −79 ft | 62.8 | 335 ft |
| September | 50.6 | −472 ft | 57.1 | −39 ft |
| October | 42.2 | −1,042 ft | 48.3 | −627 ft |
| November | 35.7 | −1,492 ft | 41.2 | −1,111 ft |
| December | 31.9 | −1,758 ft | 37.3 | −1,380 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 6R7
DENSITY ALTITUDE
Field elevation 55 ft — the air behaves like 348 ft.
- PRESSURE ALT
- 56 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
- PALB — Larsen Bay
Larsen Bay · elev 87 ft
- PAKH — Akhiok
Akhiok · elev 44 ft
- PADQ — Kodiak
Kodiak · elev 79 ft
- PORI — Port Lions
Port Lions · elev 42 ft
- PAKY — Karluk
Karluk · elev 142 ft
- PAKD — Kodiak Municipal
Kodiak · elev 139 ft
- PAAE — Ouzinkie
Ouzinkie · elev 100 ft
- PAKL — Kulik Lake
Kulik Lake · elev 717 ft
Frequently asked questions
How high does density altitude get at 6R7 in summer?
On a typical August afternoon — around 63 °F at the nearest NOAA normals station — density altitude at Old Harbor reaches roughly 335 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 6R7 on an average day?
It swings with the seasons: from roughly −1,807 ft at the coldest month's average temperature to about −79 ft at the warmest month's — all from a constant field elevation of 55 ft. The month-by-month table above carries the full year.
What is the field elevation of Old Harbor?
55 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 6R7 (FAA), in Old Harbor, Alaska.