Tanana, Alaska · field elev 242 ft
Density Altitude at Ralph M Calhoun Meml (PATA)
Ralph M Calhoun Meml sits at 242 ft, and even a typical July afternoon (71 °F) only lifts density altitude to about 1,082 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 | −9.3 | −4,577 ft | −1.2 | −3,950 ft |
| February | −1.2 | −3,950 ft | 8.2 | −3,239 ft |
| March | 6.3 | −3,382 ft | 18.9 | −2,452 ft |
| April | 27.4 | −1,842 ft | 39.3 | −1,009 ft |
| May | 46.1 | −544 ft | 58.9 | 310 ft |
| June | 57.8 | 238 ft | 70.1 | 1,037 ft |
| July | 59.8 | 370 ft | 70.8 | 1,082 ft |
| August | 53.6 | −40 ft | 63.9 | 637 ft |
| September | 42.6 | −782 ft | 51.8 | −160 ft |
| October | 24.3 | −2,063 ft | 31.3 | −1,566 ft |
| November | 3.3 | −3,608 ft | 10.5 | −3,068 ft |
| December | −5.2 | −4,258 ft | 2.4 | −3,676 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 PATA
DENSITY ALTITUDE
Field elevation 242 ft — the air behaves like 1,095 ft.
- PRESSURE ALT
- 243 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
- 80A — American Creek
American Creek · elev 513 ft
- PAML — Manley Hot Springs
Manley Hot Springs · elev 275 ft
- 2Z2 — Eureka Creek
Eureka Creek · elev 700 ft
- PFMP — Rampart
Rampart · elev 307 ft
- 20K — Quail Creek
Quail Creek · elev 1,576 ft
- PAAF — Minto Al Wright
Minto · elev 500 ft
- PAHU — Hughes
Hughes · elev 299 ft
- PAMH — Minchumina
Minchumina · elev 682 ft
Frequently asked questions
How high does density altitude get at PATA in summer?
On a typical July afternoon — around 71 °F at the nearest NOAA normals station — density altitude at Ralph M Calhoun Meml reaches roughly 1,082 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 PATA on an average day?
It swings with the seasons: from roughly −4,577 ft at the coldest month's average temperature to about 370 ft at the warmest month's — all from a constant field elevation of 242 ft. The month-by-month table above carries the full year.
What is the field elevation of Ralph M Calhoun Meml?
242 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is PATA (ICAO) / TAL (FAA), in Tanana, Alaska.