Belmar/Farmingdale, New Jersey · field elev 153 ft
Density Altitude at Monmouth Exec (KBLM)
Monmouth Exec sits at 153 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 1,959 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 | −1,607 ft | 41.7 | −955 ft |
| February | 34.7 | −1,439 ft | 44.4 | −770 ft |
| March | 41.4 | −975 ft | 51.4 | −297 ft |
| April | 52.1 | −250 ft | 63.0 | 469 ft |
| May | 61.3 | 358 ft | 72.0 | 1,049 ft |
| June | 70.6 | 960 ft | 81.1 | 1,624 ft |
| July | 76.0 | 1,303 ft | 86.5 | 1,959 ft |
| August | 74.0 | 1,176 ft | 84.6 | 1,841 ft |
| September | 67.1 | 735 ft | 78.1 | 1,436 ft |
| October | 55.5 | −24 ft | 66.6 | 702 ft |
| November | 45.9 | −668 ft | 56.2 | 22 ft |
| December | 37.4 | −1,251 ft | 46.7 | −614 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 KBLM
DENSITY ALTITUDE
Field elevation 153 ft — the air behaves like 1,990 ft.
- PRESSURE ALT
- 154 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
- N12 — Lakewood
Lakewood · elev 42 ft
- 3N6 — Old Bridge
Old Bridge · elev 87 ft
- KMJX — Ocean County
Toms River · elev 86 ft
- N87 — Trenton-Robbinsville
Robbinsville · elev 118 ft
- KLDJ — Linden
Linden · elev 22 ft
- 39N — Princeton
Princeton/Rocky Hill · elev 128 ft
- 2N6 — Redwing
Jobstown · elev 78 ft
- 47N — Central Jersey Regional
Manville · elev 86 ft
Frequently asked questions
How high does density altitude get at KBLM in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Monmouth Exec reaches roughly 1,959 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 KBLM on an average day?
It swings with the seasons: from roughly −1,607 ft at the coldest month's average temperature to about 1,303 ft at the warmest month's — all from a constant field elevation of 153 ft. The month-by-month table above carries the full year.
What is the field elevation of Monmouth Exec?
153 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KBLM (ICAO) / BLM (FAA), in Belmar/Farmingdale, New Jersey.