Plymouth, Massachusetts · field elev 148 ft
Density Altitude at Plymouth Municipal (KPYM)
Plymouth Municipal sits at 148 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 1,680 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 | 29.2 | −1,832 ft | 38.0 | −1,216 ft |
| February | 30.5 | −1,740 ft | 39.6 | −1,105 ft |
| March | 36.8 | −1,299 ft | 46.1 | −661 ft |
| April | 46.1 | −661 ft | 56.5 | 36 ft |
| May | 56.4 | 29 ft | 67.2 | 735 ft |
| June | 65.7 | 638 ft | 76.1 | 1,303 ft |
| July | 71.9 | 1,037 ft | 82.1 | 1,680 ft |
| August | 70.5 | 947 ft | 80.4 | 1,574 ft |
| September | 63.2 | 476 ft | 73.2 | 1,119 ft |
| October | 52.4 | −237 ft | 62.6 | 437 ft |
| November | 42.9 | −879 ft | 52.5 | −230 ft |
| December | 34.6 | −1,452 ft | 43.4 | −845 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 KPYM
DENSITY ALTITUDE
Field elevation 148 ft — the air behaves like 1,674 ft.
- PRESSURE ALT
- 149 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
- KGHG — Marshfield Municipal - George Harlow Field
Marshfield · elev 9 ft
- KTAN — Taunton Municipal/King Field
Taunton · elev 41 ft
- 1M8 — Myricks
Berkley · elev 73 ft
- KEWB — New Bedford Regional
New Bedford · elev 79 ft
- 2B1 — Cape Cod
Marston Mills · elev 103 ft
- 5B6 — Falmouth Airpark
Falmouth · elev 41 ft
- 1B9 — Mansfield Municipal
Mansfield · elev 123 ft
Frequently asked questions
How high does density altitude get at KPYM in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Plymouth Municipal reaches roughly 1,680 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 KPYM on an average day?
It swings with the seasons: from roughly −1,832 ft at the coldest month's average temperature to about 1,037 ft at the warmest month's — all from a constant field elevation of 148 ft. The month-by-month table above carries the full year.
What is the field elevation of Plymouth Municipal?
148 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KPYM (ICAO) / PYM (FAA), in Plymouth, Massachusetts.