Newburyport, Massachusetts · field elev 11 ft
Density Altitude at Plum Island (2B2)
Plum Island sits at 11 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 1,575 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 | 26.3 | −2,209 ft | 35.3 | −1,574 ft |
| February | 28.5 | −2,053 ft | 38.1 | −1,380 ft |
| March | 35.8 | −1,540 ft | 45.7 | −858 ft |
| April | 47.0 | −770 ft | 58.1 | −28 ft |
| May | 57.4 | −74 ft | 68.9 | 676 ft |
| June | 66.6 | 528 ft | 77.6 | 1,230 ft |
| July | 72.3 | 894 ft | 83.1 | 1,575 ft |
| August | 70.5 | 779 ft | 81.3 | 1,462 ft |
| September | 62.8 | 281 ft | 73.4 | 964 ft |
| October | 51.1 | −493 ft | 61.7 | 209 ft |
| November | 41.0 | −1,180 ft | 50.6 | −527 ft |
| December | 31.8 | −1,820 ft | 40.6 | −1,207 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 2B2
DENSITY ALTITUDE
Field elevation 11 ft — the air behaves like 1,568 ft.
- PRESSURE ALT
- 12 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
- KBVY — Beverly Regional
Beverly · elev 107 ft
- KLWM — Lawrence Municipal
Lawrence · elev 148 ft
- KBOS — General Edward Lawrence Logan International
Boston · elev 19 ft
- KBED — Laurence G Hanscom Field
Bedford · elev 132 ft
- 6B6 — Minute Man Air Field
Stow · elev 280 ft
- KOWD — Norwood Meml
Norwood · elev 49 ft
- KGHG — Marshfield Municipal - George Harlow Field
Marshfield · elev 9 ft
- KFIT — Fitchburg Municipal
Fitchburg · elev 345 ft
Frequently asked questions
How high does density altitude get at 2B2 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Plum Island reaches roughly 1,575 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 2B2 on an average day?
It swings with the seasons: from roughly −2,209 ft at the coldest month's average temperature to about 894 ft at the warmest month's — all from a constant field elevation of 11 ft. The month-by-month table above carries the full year.
What is the field elevation of Plum Island?
11 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2B2 (FAA), in Newburyport, Massachusetts.