Nantucket, Massachusetts · field elev 47 ft
Density Altitude at Nantucket Meml (KACK)
Nantucket Meml sits at 47 ft, and even a typical August afternoon (76 °F) only lifts density altitude to about 1,154 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 | 33.1 | −1,683 ft | 39.5 | −1,238 ft |
| February | 33.5 | −1,655 ft | 40.1 | −1,197 ft |
| March | 37.9 | −1,349 ft | 44.2 | −916 ft |
| April | 45.5 | −827 ft | 52.2 | −375 ft |
| May | 53.8 | −268 ft | 60.7 | 188 ft |
| June | 62.2 | 286 ft | 68.7 | 707 ft |
| July | 69.0 | 727 ft | 75.4 | 1,135 ft |
| August | 69.0 | 727 ft | 75.7 | 1,154 ft |
| September | 63.7 | 384 ft | 70.4 | 817 ft |
| October | 55.2 | −175 ft | 61.9 | 266 ft |
| November | 46.4 | −766 ft | 52.8 | −335 ft |
| December | 38.6 | −1,300 ft | 45.1 | −854 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 KACK
DENSITY ALTITUDE
Field elevation 47 ft — the air behaves like 1,173 ft.
- PRESSURE ALT
- 48 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 Massachusetts fields
- 1B2 — Katama Airpark
Edgartown · elev 18 ft
- KCQX — Chatham Municipal
Chatham · elev 64 ft
- KMVY — Martha'S Vineyard
Vineyard Haven · elev 67 ft
- KHYA — Cape Cod Gateway
Hyannis · elev 54 ft
- 5B6 — Falmouth Airpark
Falmouth · elev 41 ft
- 2B1 — Cape Cod
Marston Mills · elev 103 ft
- KEWB — New Bedford Regional
New Bedford · elev 79 ft
- KPYM — Plymouth Municipal
Plymouth · elev 148 ft
Frequently asked questions
How high does density altitude get at KACK in summer?
On a typical August afternoon — around 76 °F at the nearest NOAA normals station — density altitude at Nantucket Meml reaches roughly 1,154 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 KACK on an average day?
It swings with the seasons: from roughly −1,683 ft at the coldest month's average temperature to about 727 ft at the warmest month's — all from a constant field elevation of 47 ft. The month-by-month table above carries the full year.
What is the field elevation of Nantucket Meml?
47 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KACK (ICAO) / ACK (FAA), in Nantucket, Massachusetts.