Boundary, Alaska · field elev 2,940 ft
Density Altitude at Boundary (BYA)
Boundary sits at 2,940 ft, and even a typical July afternoon (70 °F) only lifts density altitude to about 4,350 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 | −20.0 | −1,971 ft | −11.4 | −1,302 ft |
| February | −10.6 | −1,241 ft | 0.6 | −394 ft |
| March | 3.4 | −187 ft | 20.3 | 1,034 ft |
| April | 27.1 | 1,511 ft | 42.4 | 2,553 ft |
| May | 43.8 | 2,646 ft | 58.2 | 3,589 ft |
| June | 53.3 | 3,272 ft | 68.5 | 4,244 ft |
| July | 56.1 | 3,454 ft | 70.2 | 4,350 ft |
| August | 50.3 | 3,076 ft | 64.3 | 3,979 ft |
| September | 39.3 | 2,345 ft | 52.7 | 3,233 ft |
| October | 20.0 | 1,013 ft | 30.5 | 1,746 ft |
| November | −5.3 | −837 ft | 3.5 | −179 ft |
| December | −14.9 | −1,573 ft | −7.0 | −966 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 BYA
DENSITY ALTITUDE
Field elevation 2,940 ft — the air behaves like 4,338 ft.
- PRESSURE ALT
- 2,942 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
- PAAY — Chicken
Chicken · elev 1,640 ft
- PAEG — Eagle
Eagle · elev 907 ft
- PFTO — Tok Junction
Tok · elev 1,643 ft
- 3T4 — Tetlin
Tetlin · elev 1,671 ft
- PAOR — Northway
Northway · elev 1,720 ft
- TSG — Tanacross
Tanacross · elev 1,559 ft
- L20 — Coal Creek
Yukon Charley Rivers · elev 867 ft
- D66 — Delta Junction
Delta Junction · elev 1,150 ft
Frequently asked questions
How high does density altitude get at BYA in summer?
On a typical July afternoon — around 70 °F at the nearest NOAA normals station — density altitude at Boundary reaches roughly 4,350 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 BYA on an average day?
It swings with the seasons: from roughly −1,971 ft at the coldest month's average temperature to about 3,454 ft at the warmest month's — all from a constant field elevation of 2,940 ft. The month-by-month table above carries the full year.
What is the field elevation of Boundary?
2,940 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is BYA (FAA), in Boundary, Alaska.