New Orleans, Louisiana · field elev 3 ft
Density Altitude at Louis Armstrong New Orleans International (KMSY)
Louis Armstrong New Orleans International sits at 3 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 2,077 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 | 54.3 | −289 ft | 62.5 | 251 ft |
| February | 58.0 | −44 ft | 66.4 | 505 ft |
| March | 63.8 | 336 ft | 72.3 | 884 ft |
| April | 70.1 | 743 ft | 78.5 | 1,277 ft |
| May | 77.1 | 1,189 ft | 85.3 | 1,702 ft |
| June | 82.4 | 1,521 ft | 90.0 | 1,991 ft |
| July | 83.9 | 1,615 ft | 91.4 | 2,077 ft |
| August | 84.0 | 1,621 ft | 91.3 | 2,071 ft |
| September | 80.8 | 1,421 ft | 88.1 | 1,874 ft |
| October | 72.5 | 897 ft | 80.6 | 1,409 ft |
| November | 62.4 | 245 ft | 71.2 | 814 ft |
| December | 56.6 | −137 ft | 64.8 | 401 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 KMSY
DENSITY ALTITUDE
Field elevation 3 ft — the air behaves like 2,052 ft.
- PRESSURE ALT
- 4 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 Louisiana fields
- KNEW — Lakefront
New Orleans · elev 7 ft
- KAPS — Port Of South Louisiana Exec Regional
Reserve · elev 7 ft
- L31 — St Tammany Regional
Covington · elev 38 ft
- KASD — Slidell
Slidell · elev 28 ft
- KHDC — Hammond Northshore Regional
Hammond · elev 46 ft
- KHUM — Houma-Terrebonne
Houma · elev 9 ft
- KGAO — South Lafourche Leonard Miller Jr
Galliano · elev 0 ft
- L83 — Thibodaux Municipal
Thibodaux · elev 9 ft
Frequently asked questions
How high does density altitude get at KMSY in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Louis Armstrong New Orleans International reaches roughly 2,077 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 KMSY on an average day?
It swings with the seasons: from roughly −289 ft at the coldest month's average temperature to about 1,621 ft at the warmest month's — all from a constant field elevation of 3 ft. The month-by-month table above carries the full year.
What is the field elevation of Louis Armstrong New Orleans International?
3 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMSY (ICAO) / MSY (FAA), in New Orleans, Louisiana.