New York, New York · field elev 491 ft
Density Altitude at New York Stewart International (KSWF)
New York Stewart International sits at 491 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,285 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 | −1,636 ft | 36.3 | −906 ft |
| February | 28.3 | −1,466 ft | 39.2 | −706 ft |
| March | 36.6 | −885 ft | 47.4 | −147 ft |
| April | 48.5 | −73 ft | 60.5 | 723 ft |
| May | 59.3 | 644 ft | 71.4 | 1,426 ft |
| June | 68.1 | 1,215 ft | 79.8 | 1,956 ft |
| July | 73.0 | 1,527 ft | 85.1 | 2,285 ft |
| August | 71.0 | 1,400 ft | 82.6 | 2,130 ft |
| September | 63.5 | 918 ft | 75.7 | 1,698 ft |
| October | 51.8 | 148 ft | 64.1 | 957 ft |
| November | 41.4 | −555 ft | 52.2 | 175 ft |
| December | 31.9 | −1,213 ft | 41.1 | −575 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 KSWF
DENSITY ALTITUDE
Field elevation 491 ft — the air behaves like 2,279 ft.
- PRESSURE ALT
- 492 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
- KMGJ — Orange County
Montgomery · elev 370 ft
- N45 — Kobelt
Wallkill · elev 420 ft
- KPOU — Hudson Valley Regional
Poughkeepsie · elev 164 ft
- 06N — Randall
Middletown · elev 523 ft
- N72 — Warwick Municipal
Warwick · elev 540 ft
- N82 — Wurtsboro/Sullivan County
Wurtsboro · elev 548 ft
- N69 — Stormville
Stormville · elev 358 ft
- N89 — Joseph Y Resnick
Ellenville · elev 290 ft
Frequently asked questions
How high does density altitude get at KSWF in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at New York Stewart International reaches roughly 2,285 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 KSWF on an average day?
It swings with the seasons: from roughly −1,636 ft at the coldest month's average temperature to about 1,527 ft at the warmest month's — all from a constant field elevation of 491 ft. The month-by-month table above carries the full year.
What is the field elevation of New York Stewart International?
491 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSWF (ICAO) / SWF (FAA), in New York, New York.