Mansfield, Massachusetts · field elev 123 ft
Density Altitude at Mansfield Municipal (1B9)
Mansfield Municipal sits at 123 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 1,674 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 | 27.4 | −1,991 ft | 36.5 | −1,351 ft |
| February | 29.1 | −1,870 ft | 38.9 | −1,185 ft |
| March | 36.4 | −1,358 ft | 46.2 | −685 ft |
| April | 46.7 | −651 ft | 58.0 | 104 ft |
| May | 57.2 | 51 ft | 68.6 | 795 ft |
| June | 66.2 | 640 ft | 77.1 | 1,336 ft |
| July | 72.1 | 1,019 ft | 82.5 | 1,674 ft |
| August | 70.5 | 916 ft | 80.9 | 1,574 ft |
| September | 62.6 | 406 ft | 73.2 | 1,089 ft |
| October | 51.1 | −355 ft | 61.2 | 314 ft |
| November | 41.5 | −1,006 ft | 51.1 | −355 ft |
| December | 32.9 | −1,602 ft | 41.5 | −1,006 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 1B9
DENSITY ALTITUDE
Field elevation 123 ft — the air behaves like 1,705 ft.
- PRESSURE ALT
- 124 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
- KTAN — Taunton Municipal/King Field
Taunton · elev 41 ft
- KOWD — Norwood Meml
Norwood · elev 49 ft
- 1M8 — Myricks
Berkley · elev 73 ft
- 1B6 — Hopedale Industrial Park
Hopedale · elev 269 ft
- 28M — Cranland
Hanson · elev 71 ft
- KPYM — Plymouth Municipal
Plymouth · elev 148 ft
- KEWB — New Bedford Regional
New Bedford · elev 79 ft
- KBOS — General Edward Lawrence Logan International
Boston · elev 19 ft
Frequently asked questions
How high does density altitude get at 1B9 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Mansfield Municipal reaches roughly 1,674 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 1B9 on an average day?
It swings with the seasons: from roughly −1,991 ft at the coldest month's average temperature to about 1,019 ft at the warmest month's — all from a constant field elevation of 123 ft. The month-by-month table above carries the full year.
What is the field elevation of Mansfield Municipal?
123 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1B9 (FAA), in Mansfield, Massachusetts.