Black Rapids, Alaska · field elev 2,125 ft
Density Altitude at Black Rapids (5BK)
Black Rapids sits at 2,125 ft, and even a typical July afternoon (66 °F) only lifts density altitude to about 3,081 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 | −1.8 | −1,606 ft | 6.5 | −987 ft |
| February | 4.2 | −1,157 ft | 15.2 | −352 ft |
| March | 9.8 | −744 ft | 22.4 | 162 ft |
| April | 26.0 | 416 ft | 37.0 | 1,177 ft |
| May | 40.4 | 1,408 ft | 50.9 | 2,109 ft |
| June | 50.7 | 2,096 ft | 62.6 | 2,870 ft |
| July | 54.5 | 2,346 ft | 65.9 | 3,081 ft |
| August | 49.9 | 2,043 ft | 60.1 | 2,709 ft |
| September | 40.9 | 1,442 ft | 50.5 | 2,083 ft |
| October | 24.4 | 304 ft | 32.6 | 875 ft |
| November | 5.5 | −1,060 ft | 14.7 | −388 ft |
| December | 1.1 | −1,388 ft | 11.0 | −657 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 5BK
DENSITY ALTITUDE
Field elevation 2,125 ft — the air behaves like 3,087 ft.
- PRESSURE ALT
- 2,126 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
- D66 — Delta Junction
Delta Junction · elev 1,150 ft
- PAXK — Paxson
Paxson · elev 2,653 ft
- CZO — Chistochina
Chistochina · elev 1,861 ft
- PAAN — Gold King Creek
Fairbanks · elev 1,720 ft
- TSG — Tanacross
Tanacross · elev 1,559 ft
- 9AK — Totatlanika River
Totatlanika River · elev 2,717 ft
- PAAO — Lake Louise
Lake Louise · elev 2,480 ft
- PFTO — Tok Junction
Tok · elev 1,643 ft
Frequently asked questions
How high does density altitude get at 5BK in summer?
On a typical July afternoon — around 66 °F at the nearest NOAA normals station — density altitude at Black Rapids reaches roughly 3,081 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 5BK on an average day?
It swings with the seasons: from roughly −1,606 ft at the coldest month's average temperature to about 2,346 ft at the warmest month's — all from a constant field elevation of 2,125 ft. The month-by-month table above carries the full year.
What is the field elevation of Black Rapids?
2,125 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5BK (FAA), in Black Rapids, Alaska.