Boston, Massachusetts · field elev 19 ft
Density Altitude at General Edward Lawrence Logan International (KBOS)
General Edward Lawrence Logan International sits at 19 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 1,522 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 | 29.9 | −1,944 ft | 36.8 | −1,460 ft |
| February | 31.8 | −1,810 ft | 39.0 | −1,308 ft |
| March | 38.3 | −1,356 ft | 45.5 | −862 ft |
| April | 48.6 | −652 ft | 56.4 | −130 ft |
| May | 58.4 | 2 ft | 66.5 | 531 ft |
| June | 68.0 | 628 ft | 76.2 | 1,152 ft |
| July | 74.1 | 1,018 ft | 82.1 | 1,522 ft |
| August | 72.7 | 929 ft | 80.4 | 1,416 ft |
| September | 65.6 | 473 ft | 73.1 | 955 ft |
| October | 54.8 | −236 ft | 62.1 | 245 ft |
| November | 44.7 | −916 ft | 51.6 | −450 ft |
| December | 35.7 | −1,537 ft | 42.2 | −1,087 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 KBOS
DENSITY ALTITUDE
Field elevation 19 ft — the air behaves like 1,516 ft.
- PRESSURE ALT
- 20 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
- KOWD — Norwood Meml
Norwood · elev 49 ft
- KBVY — Beverly Regional
Beverly · elev 107 ft
- KBED — Laurence G Hanscom Field
Bedford · elev 132 ft
- 28M — Cranland
Hanson · elev 71 ft
- KGHG — Marshfield Municipal - George Harlow Field
Marshfield · elev 9 ft
- KLWM — Lawrence Municipal
Lawrence · elev 148 ft
- 1B9 — Mansfield Municipal
Mansfield · elev 123 ft
- 6B6 — Minute Man Air Field
Stow · elev 280 ft
Frequently asked questions
How high does density altitude get at KBOS in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at General Edward Lawrence Logan International reaches roughly 1,522 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 KBOS on an average day?
It swings with the seasons: from roughly −1,944 ft at the coldest month's average temperature to about 1,018 ft at the warmest month's — all from a constant field elevation of 19 ft. The month-by-month table above carries the full year.
What is the field elevation of General Edward Lawrence Logan International?
19 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KBOS (ICAO) / BOS (FAA), in Boston, Massachusetts.