Covington, Louisiana · field elev 38 ft
Density Altitude at St Tammany Regional (L31)
St Tammany Regional sits at 38 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,040 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 | 50.8 | −480 ft | 61.5 | 229 ft |
| February | 54.6 | −226 ft | 65.7 | 503 ft |
| March | 60.7 | 177 ft | 72.4 | 933 ft |
| April | 66.6 | 561 ft | 77.8 | 1,276 ft |
| May | 73.5 | 1,004 ft | 84.3 | 1,682 ft |
| June | 79.1 | 1,358 ft | 88.7 | 1,954 ft |
| July | 80.7 | 1,458 ft | 90.1 | 2,040 ft |
| August | 80.8 | 1,464 ft | 90.0 | 2,034 ft |
| September | 77.1 | 1,232 ft | 86.7 | 1,831 ft |
| October | 68.1 | 658 ft | 79.4 | 1,376 ft |
| November | 58.4 | 26 ft | 69.8 | 767 ft |
| December | 53.0 | −333 ft | 63.5 | 360 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 L31
DENSITY ALTITUDE
Field elevation 38 ft — the air behaves like 2,034 ft.
- PRESSURE ALT
- 39 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
- KASD — Slidell
Slidell · elev 28 ft
- KHDC — Hammond Northshore Regional
Hammond · elev 46 ft
- KBXA — George R Carr Meml Air Field
Bogalusa · elev 119 ft
- 2R7 — Franklinton
Franklinton · elev 175 ft
- KNEW — Lakefront
New Orleans · elev 7 ft
- KMSY — Louis Armstrong New Orleans International
New Orleans · elev 3 ft
- KAPS — Port Of South Louisiana Exec Regional
Reserve · elev 7 ft
- KREG — Louisiana Regional
Gonzales · elev 14 ft
Frequently asked questions
How high does density altitude get at L31 in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at St Tammany Regional reaches roughly 2,040 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 L31 on an average day?
It swings with the seasons: from roughly −480 ft at the coldest month's average temperature to about 1,464 ft at the warmest month's — all from a constant field elevation of 38 ft. The month-by-month table above carries the full year.
What is the field elevation of St Tammany Regional?
38 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is L31 (FAA), in Covington, Louisiana.