West Milford, New Jersey · field elev 790 ft
Density Altitude at Greenwood Lake (4N1)
Greenwood Lake sits at 790 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,514 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 | 27.2 | −1,169 ft | 35.8 | −568 ft |
| February | 29.0 | −1,042 ft | 38.6 | −375 ft |
| March | 36.9 | −492 ft | 46.6 | 170 ft |
| April | 48.2 | 278 ft | 58.9 | 987 ft |
| May | 58.6 | 967 ft | 69.8 | 1,691 ft |
| June | 67.3 | 1,531 ft | 77.8 | 2,196 ft |
| July | 72.1 | 1,837 ft | 82.9 | 2,514 ft |
| August | 70.4 | 1,729 ft | 81.3 | 2,414 ft |
| September | 63.6 | 1,292 ft | 74.8 | 2,008 ft |
| October | 52.1 | 538 ft | 62.9 | 1,247 ft |
| November | 41.6 | −169 ft | 51.1 | 472 ft |
| December | 32.9 | −769 ft | 40.8 | −224 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 4N1
DENSITY ALTITUDE
Field elevation 790 ft — the air behaves like 2,520 ft.
- PRESSURE ALT
- 791 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
- N07 — Lincoln Park
Lincoln Park · elev 181 ft
- KFWN — Sussex
Sussex · elev 422 ft
- KCDW — Essex County
Caldwell · elev 172 ft
- 12N — Aeroflex/Andover
Andover · elev 583 ft
- KMMU — Morristown Municipal
Morristown · elev 187 ft
- KTEB — Teterboro
Teterboro · elev 8 ft
- KEWR — Newark Liberty International
Newark · elev 18 ft
- N05 — Hackettstown
Hackettstown · elev 670 ft
Frequently asked questions
How high does density altitude get at 4N1 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Greenwood Lake reaches roughly 2,514 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 4N1 on an average day?
It swings with the seasons: from roughly −1,169 ft at the coldest month's average temperature to about 1,837 ft at the warmest month's — all from a constant field elevation of 790 ft. The month-by-month table above carries the full year.
What is the field elevation of Greenwood Lake?
790 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4N1 (FAA), in West Milford, New Jersey.