Tanacross, Alaska · field elev 1,559 ft
Density Altitude at Tanacross (TSG)
Tanacross sits at 1,559 ft, and even a typical July afternoon (72 °F) only lifts density altitude to about 2,786 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 | −11.9 | −3,100 ft | −3.7 | −2,468 ft |
| February | −2.5 | −2,377 ft | 8.3 | −1,568 ft |
| March | 9.6 | −1,472 ft | 24.1 | −426 ft |
| April | 31.2 | 72 ft | 44.6 | 989 ft |
| May | 45.9 | 1,076 ft | 61.0 | 2,071 ft |
| June | 56.5 | 1,778 ft | 71.1 | 2,716 ft |
| July | 59.1 | 1,948 ft | 72.2 | 2,786 ft |
| August | 53.5 | 1,581 ft | 66.8 | 2,443 ft |
| September | 42.1 | 820 ft | 53.6 | 1,588 ft |
| October | 22.7 | −525 ft | 31.4 | 86 ft |
| November | 0.0 | −2,187 ft | 8.0 | −1,590 ft |
| December | −10.1 | −2,960 ft | −2.4 | −2,369 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 TSG
DENSITY ALTITUDE
Field elevation 1,559 ft — the air behaves like 2,773 ft.
- PRESSURE ALT
- 1,560 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
- PFTO — Tok Junction
Tok · elev 1,643 ft
- 3T4 — Tetlin
Tetlin · elev 1,671 ft
- PAOR — Northway
Northway · elev 1,720 ft
- PAAY — Chicken
Chicken · elev 1,640 ft
- CZO — Chistochina
Chistochina · elev 1,861 ft
- PAXK — Paxson
Paxson · elev 2,653 ft
- 5BK — Black Rapids
Black Rapids · elev 2,125 ft
- BYA — Boundary
Boundary · elev 2,940 ft
Frequently asked questions
How high does density altitude get at TSG in summer?
On a typical July afternoon — around 72 °F at the nearest NOAA normals station — density altitude at Tanacross reaches roughly 2,786 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 TSG on an average day?
It swings with the seasons: from roughly −3,100 ft at the coldest month's average temperature to about 1,948 ft at the warmest month's — all from a constant field elevation of 1,559 ft. The month-by-month table above carries the full year.
What is the field elevation of Tanacross?
1,559 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is TSG (FAA), in Tanacross, Alaska.