Old Bridge, New Jersey · field elev 87 ft
Density Altitude at Old Bridge (3N6)
Old Bridge sits at 87 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 1,878 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 | 32.3 | −1,689 ft | 41.7 | −1,037 ft |
| February | 34.7 | −1,521 ft | 44.4 | −852 ft |
| March | 41.4 | −1,057 ft | 51.4 | −379 ft |
| April | 52.1 | −332 ft | 63.0 | 388 ft |
| May | 61.3 | 277 ft | 72.0 | 968 ft |
| June | 70.6 | 879 ft | 81.1 | 1,543 ft |
| July | 76.0 | 1,222 ft | 86.5 | 1,878 ft |
| August | 74.0 | 1,095 ft | 84.6 | 1,761 ft |
| September | 67.1 | 654 ft | 78.1 | 1,355 ft |
| October | 55.5 | −106 ft | 66.6 | 621 ft |
| November | 45.9 | −750 ft | 56.2 | −59 ft |
| December | 37.4 | −1,334 ft | 46.7 | −696 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 3N6
DENSITY ALTITUDE
Field elevation 87 ft — the air behaves like 1,909 ft.
- PRESSURE ALT
- 88 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 New Jersey fields
- KBLM — Monmouth Exec
Belmar/Farmingdale · elev 153 ft
- N87 — Trenton-Robbinsville
Robbinsville · elev 118 ft
- 39N — Princeton
Princeton/Rocky Hill · elev 128 ft
- 47N — Central Jersey Regional
Manville · elev 86 ft
- N12 — Lakewood
Lakewood · elev 42 ft
- KLDJ — Linden
Linden · elev 22 ft
- KTTN — Trenton Mercer
Trenton · elev 213 ft
- KSMQ — Somerset
Somerville · elev 106 ft
Frequently asked questions
How high does density altitude get at 3N6 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Old Bridge reaches roughly 1,878 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 3N6 on an average day?
It swings with the seasons: from roughly −1,689 ft at the coldest month's average temperature to about 1,222 ft at the warmest month's — all from a constant field elevation of 87 ft. The month-by-month table above carries the full year.
What is the field elevation of Old Bridge?
87 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3N6 (FAA), in Old Bridge, New Jersey.