Marshfield, Massachusetts · field elev 9 ft
Density Altitude at Marshfield Municipal - George Harlow Field (KGHG)
Marshfield Municipal - George Harlow Field sits at 9 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 1,628 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 | 31.4 | −1,850 ft | 41.0 | −1,182 ft |
| February | 33.0 | −1,738 ft | 42.8 | −1,059 ft |
| March | 39.0 | −1,320 ft | 49.1 | −630 ft |
| April | 48.8 | −651 ft | 59.2 | 42 ft |
| May | 58.5 | −4 ft | 69.1 | 686 ft |
| June | 68.3 | 635 ft | 78.5 | 1,284 ft |
| July | 74.0 | 1,000 ft | 84.0 | 1,628 ft |
| August | 72.7 | 917 ft | 82.3 | 1,522 ft |
| September | 66.3 | 506 ft | 75.7 | 1,108 ft |
| October | 55.6 | −195 ft | 65.4 | 448 ft |
| November | 45.8 | −854 ft | 55.1 | −229 ft |
| December | 37.1 | −1,452 ft | 45.9 | −847 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 KGHG
DENSITY ALTITUDE
Field elevation 9 ft — the air behaves like 1,628 ft.
- PRESSURE ALT
- 10 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
- 28M — Cranland
Hanson · elev 71 ft
- KPYM — Plymouth Municipal
Plymouth · elev 148 ft
- KPVC — Provincetown Municipal
Provincetown · elev 8 ft
- KTAN — Taunton Municipal/King Field
Taunton · elev 41 ft
- KBOS — General Edward Lawrence Logan International
Boston · elev 19 ft
- 1M8 — Myricks
Berkley · elev 73 ft
- KOWD — Norwood Meml
Norwood · elev 49 ft
- 1B9 — Mansfield Municipal
Mansfield · elev 123 ft
Frequently asked questions
How high does density altitude get at KGHG in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Marshfield Municipal - George Harlow Field reaches roughly 1,628 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 KGHG on an average day?
It swings with the seasons: from roughly −1,850 ft at the coldest month's average temperature to about 1,000 ft at the warmest month's — all from a constant field elevation of 9 ft. The month-by-month table above carries the full year.
What is the field elevation of Marshfield Municipal - George Harlow Field?
9 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGHG (ICAO) / GHG (FAA), in Marshfield, Massachusetts.