Mount Vernon, Texas · field elev 412 ft
Density Altitude at Franklin County (F53)
Franklin County sits at 412 ft, and even a typical August afternoon (95 °F) only lifts density altitude to about 2,769 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 | 44.9 | −414 ft | 55.6 | 303 ft |
| February | 49.0 | −137 ft | 60.2 | 605 ft |
| March | 56.3 | 349 ft | 68.1 | 1,118 ft |
| April | 63.6 | 827 ft | 75.5 | 1,589 ft |
| May | 71.8 | 1,354 ft | 82.2 | 2,009 ft |
| June | 79.7 | 1,853 ft | 90.0 | 2,489 ft |
| July | 83.5 | 2,089 ft | 94.3 | 2,751 ft |
| August | 83.3 | 2,077 ft | 94.6 | 2,769 ft |
| September | 76.4 | 1,646 ft | 88.2 | 2,379 ft |
| October | 65.6 | 957 ft | 77.3 | 1,702 ft |
| November | 54.8 | 250 ft | 65.8 | 970 ft |
| December | 46.8 | −286 ft | 57.6 | 435 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 F53
DENSITY ALTITUDE
Field elevation 412 ft — the air behaves like 2,793 ft.
- PRESSURE ALT
- 413 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
- KOSA — Mount Pleasant Regional
Mount Pleasant · elev 364 ft
- F51 — Winnsboro Municipal
Winnsboro · elev 513 ft
- KSLR — Sulphur Springs Municipal
Sulphur Springs · elev 489 ft
- KLBR — Clarksville/Red River Cty-J D Trissell Field
Clarksville · elev 440 ft
- 8F5 — Greater Morris County
Daingerfield · elev 402 ft
- KPRX — Cox Field
Paris · elev 548 ft
- KJDD — Wood County/Collins Field
Mineola/Quitman · elev 433 ft
- 2F7 — Commerce Municipal
Commerce · elev 516 ft
Frequently asked questions
How high does density altitude get at F53 in summer?
On a typical August afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Franklin County reaches roughly 2,769 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 F53 on an average day?
It swings with the seasons: from roughly −414 ft at the coldest month's average temperature to about 2,089 ft at the warmest month's — all from a constant field elevation of 412 ft. The month-by-month table above carries the full year.
What is the field elevation of Franklin County?
412 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is F53 (FAA), in Mount Vernon, Texas.