Cantwell, Alaska · field elev 2,190 ft
Density Altitude at Cantwell (PATW)
Cantwell sits at 2,190 ft, and even a typical July afternoon (66 °F) only lifts density altitude to about 3,154 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 | 0.7 | −1,336 ft | 9.9 | −655 ft |
| February | 7.7 | −816 ft | 19.0 | 2 ft |
| March | 11.7 | −524 ft | 25.4 | 455 ft |
| April | 27.7 | 616 ft | 39.5 | 1,428 ft |
| May | 41.5 | 1,563 ft | 54.0 | 2,393 ft |
| June | 52.0 | 2,262 ft | 65.0 | 3,103 ft |
| July | 55.2 | 2,471 ft | 65.8 | 3,154 ft |
| August | 50.7 | 2,176 ft | 60.6 | 2,821 ft |
| September | 40.7 | 1,509 ft | 50.3 | 2,150 ft |
| October | 25.1 | 434 ft | 33.7 | 1,032 ft |
| November | 9.2 | −706 ft | 18.4 | −41 ft |
| December | 3.9 | −1,097 ft | 13.4 | −400 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 PATW
DENSITY ALTITUDE
Field elevation 2,190 ft — the air behaves like 3,167 ft.
- PRESSURE ALT
- 2,191 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
- PAST — Summit
Summit · elev 2,409 ft
- PAIN — Mc Kinley Ntl Park
Mckinley Park · elev 1,720 ft
- PAHV — Healy River
Healy · elev 1,275 ft
- 2Z3 — Eva Creek
Eva Creek · elev 2,817 ft
- 9AK — Totatlanika River
Totatlanika River · elev 2,717 ft
- Z90 — Stampede
Kantishna · elev 1,852 ft
- 2AN — Tischner Air
Anderson · elev 647 ft
- PACL — Clear
Clear · elev 559 ft
Frequently asked questions
How high does density altitude get at PATW in summer?
On a typical July afternoon — around 66 °F at the nearest NOAA normals station — density altitude at Cantwell reaches roughly 3,154 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 PATW on an average day?
It swings with the seasons: from roughly −1,336 ft at the coldest month's average temperature to about 2,471 ft at the warmest month's — all from a constant field elevation of 2,190 ft. The month-by-month table above carries the full year.
What is the field elevation of Cantwell?
2,190 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is PATW (ICAO) / TTW (FAA), in Cantwell, Alaska.