Islesboro, Maine · field elev 88 ft
Density Altitude at Islesboro (57B)
Islesboro sits at 88 ft, and even a typical July afternoon (77 °F) only lifts density altitude to about 1,287 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 | 19.8 | −2,580 ft | 29.5 | −1,886 ft |
| February | 21.9 | −2,428 ft | 32.2 | −1,695 ft |
| March | 30.1 | −1,843 ft | 39.7 | −1,173 ft |
| April | 41.3 | −1,063 ft | 51.5 | −371 ft |
| May | 52.1 | −331 ft | 62.9 | 382 ft |
| June | 61.0 | 258 ft | 71.5 | 937 ft |
| July | 66.8 | 635 ft | 77.0 | 1,287 ft |
| August | 66.0 | 584 ft | 76.4 | 1,249 ft |
| September | 58.8 | 114 ft | 69.5 | 809 ft |
| October | 47.7 | −627 ft | 57.4 | 21 ft |
| November | 37.2 | −1,346 ft | 45.6 | −769 ft |
| December | 26.6 | −2,092 ft | 34.9 | −1,506 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 57B
DENSITY ALTITUDE
Field elevation 88 ft — the air behaves like 1,287 ft.
- PRESSURE ALT
- 89 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 Maine fields
- KBST — Belfast Municipal
Belfast · elev 198 ft
- 93B — Stonington Municipal
Stonington · elev 32 ft
- KRKD — Knox County Regional
Rockland · elev 55 ft
- ME5 — Banks
Swans Island · elev 100 ft
- KBHB — Hancock County/Bar Harbor
Bar Harbor · elev 83 ft
- 0B2 — Brewer
Brewer · elev 125 ft
- KBGR — Bangor International
Bangor · elev 192 ft
- PG1 — Griffin Field
Levant · elev 200 ft
Frequently asked questions
How high does density altitude get at 57B in summer?
On a typical July afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Islesboro reaches roughly 1,287 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 57B on an average day?
It swings with the seasons: from roughly −2,580 ft at the coldest month's average temperature to about 635 ft at the warmest month's — all from a constant field elevation of 88 ft. The month-by-month table above carries the full year.
What is the field elevation of Islesboro?
88 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 57B (FAA), in Islesboro, Maine.