Montgomery, New York · field elev 370 ft
Density Altitude at Orange County (KMGJ)
Orange County sits at 370 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,044 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 | 25.9 | −1,788 ft | 34.6 | −1,175 ft |
| February | 28.1 | −1,632 ft | 37.8 | −953 ft |
| March | 36.7 | −1,029 ft | 46.7 | −344 ft |
| April | 48.0 | −257 ft | 59.9 | 534 ft |
| May | 58.5 | 442 ft | 70.5 | 1,220 ft |
| June | 67.4 | 1,021 ft | 78.9 | 1,751 ft |
| July | 72.2 | 1,328 ft | 83.6 | 2,044 ft |
| August | 70.4 | 1,213 ft | 81.5 | 1,914 ft |
| September | 62.6 | 710 ft | 74.1 | 1,449 ft |
| October | 51.3 | −35 ft | 62.3 | 691 ft |
| November | 40.5 | −767 ft | 50.4 | −95 ft |
| December | 31.3 | −1,406 ft | 39.4 | −843 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 KMGJ
DENSITY ALTITUDE
Field elevation 370 ft — the air behaves like 2,069 ft.
- PRESSURE ALT
- 371 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 York fields
- KSWF — New York Stewart International
New York · elev 491 ft
- 06N — Randall
Middletown · elev 523 ft
- N45 — Kobelt
Wallkill · elev 420 ft
- N82 — Wurtsboro/Sullivan County
Wurtsboro · elev 548 ft
- N72 — Warwick Municipal
Warwick · elev 540 ft
- N89 — Joseph Y Resnick
Ellenville · elev 290 ft
- KPOU — Hudson Valley Regional
Poughkeepsie · elev 164 ft
- N69 — Stormville
Stormville · elev 358 ft
Frequently asked questions
How high does density altitude get at KMGJ in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Orange County reaches roughly 2,044 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 KMGJ on an average day?
It swings with the seasons: from roughly −1,788 ft at the coldest month's average temperature to about 1,328 ft at the warmest month's — all from a constant field elevation of 370 ft. The month-by-month table above carries the full year.
What is the field elevation of Orange County?
370 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMGJ (ICAO) / MGJ (FAA), in Montgomery, New York.