Mount Pleasant, Texas · field elev 364 ft
Density Altitude at Mount Pleasant Regional (KOSA)
Mount Pleasant Regional sits at 364 ft, and even a typical August afternoon (94 °F) only lifts density altitude to about 2,680 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 | 44.0 | −535 ft | 55.9 | 263 ft |
| February | 47.7 | −284 ft | 59.7 | 514 ft |
| March | 55.3 | 224 ft | 67.6 | 1,026 ft |
| April | 62.5 | 696 ft | 75.2 | 1,511 ft |
| May | 71.3 | 1,263 ft | 82.3 | 1,956 ft |
| June | 78.8 | 1,738 ft | 89.6 | 2,406 ft |
| July | 82.2 | 1,950 ft | 93.3 | 2,632 ft |
| August | 82.3 | 1,956 ft | 94.1 | 2,680 ft |
| September | 75.6 | 1,536 ft | 88.2 | 2,321 ft |
| October | 64.5 | 826 ft | 77.9 | 1,681 ft |
| November | 53.5 | 104 ft | 66.1 | 930 ft |
| December | 45.9 | −406 ft | 57.7 | 382 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 KOSA
DENSITY ALTITUDE
Field elevation 364 ft — the air behaves like 2,674 ft.
- PRESSURE ALT
- 365 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 Texas fields
- 8F5 — Greater Morris County
Daingerfield · elev 402 ft
- F53 — Franklin County
Mount Vernon · elev 412 ft
- F51 — Winnsboro Municipal
Winnsboro · elev 513 ft
- KJXI — Fox Stephens Field/Gilmer Municipal
Gilmer · elev 415 ft
- KLBR — Clarksville/Red River Cty-J D Trissell Field
Clarksville · elev 440 ft
- KSLR — Sulphur Springs Municipal
Sulphur Springs · elev 489 ft
- 07F — Gladewater Municipal
Gladewater · elev 297 ft
- KJDD — Wood County/Collins Field
Mineola/Quitman · elev 433 ft
Frequently asked questions
How high does density altitude get at KOSA in summer?
On a typical August afternoon — around 94 °F at the nearest NOAA normals station — density altitude at Mount Pleasant Regional reaches roughly 2,680 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 KOSA on an average day?
It swings with the seasons: from roughly −535 ft at the coldest month's average temperature to about 1,956 ft at the warmest month's — all from a constant field elevation of 364 ft. The month-by-month table above carries the full year.
What is the field elevation of Mount Pleasant Regional?
364 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KOSA (ICAO) / OSA (FAA), in Mount Pleasant, Texas.