Port Graham, Alaska · field elev 93 ft
Density Altitude at Port Graham (PGM)
Port Graham sits at 93 ft, and even a typical July afternoon (62 °F) only lifts density altitude to about 317 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 | 25.8 | −2,142 ft | 30.8 | −1,788 ft |
| February | 28.4 | −1,957 ft | 33.5 | −1,598 ft |
| March | 29.5 | −1,879 ft | 35.5 | −1,458 ft |
| April | 36.9 | −1,361 ft | 43.3 | −920 ft |
| May | 44.3 | −852 ft | 51.2 | −385 ft |
| June | 50.9 | −405 ft | 58.1 | 74 ft |
| July | 55.4 | −105 ft | 61.8 | 317 ft |
| August | 54.7 | −151 ft | 61.5 | 297 ft |
| September | 48.6 | −560 ft | 54.7 | −151 ft |
| October | 39.7 | −1,167 ft | 45.4 | −777 ft |
| November | 31.5 | −1,738 ft | 36.1 | −1,416 ft |
| December | 28.2 | −1,971 ft | 32.9 | −1,640 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 PGM
DENSITY ALTITUDE
Field elevation 93 ft — the air behaves like 330 ft.
- PRESSURE ALT
- 94 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
- PAAW — Nanwalek
Nanwalek · elev 27 ft
- PASO — Seldovia
Seldovia · elev 29 ft
- 4Z9 — Jakolof Bay
Jakolof Bay · elev 5 ft
- PAHO — Homer
Homer · elev 84 ft
- NIN — Ninilchik
Ninilchik · elev 276 ft
- 5KS — Kasilof
Kasilof · elev 125 ft
- PASX — Soldotna
Soldotna · elev 113 ft
- 4K0 — Pedro Bay
Pedro Bay · elev 84 ft
Frequently asked questions
How high does density altitude get at PGM in summer?
On a typical July afternoon — around 62 °F at the nearest NOAA normals station — density altitude at Port Graham reaches roughly 317 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 PGM on an average day?
It swings with the seasons: from roughly −2,142 ft at the coldest month's average temperature to about −105 ft at the warmest month's — all from a constant field elevation of 93 ft. The month-by-month table above carries the full year.
What is the field elevation of Port Graham?
93 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is PGM (FAA), in Port Graham, Alaska.