San Augustine, Texas · field elev 443 ft
Density Altitude at San Augustine County (78R)
San Augustine County sits at 443 ft, and even a typical August afternoon (94 °F) only lifts density altitude to about 2,794 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 | 47.4 | −207 ft | 59.5 | 598 ft |
| February | 51.1 | 42 ft | 63.2 | 839 ft |
| March | 57.7 | 480 ft | 70.2 | 1,290 ft |
| April | 64.7 | 937 ft | 76.9 | 1,715 ft |
| May | 72.5 | 1,437 ft | 84.0 | 2,158 ft |
| June | 79.0 | 1,847 ft | 90.3 | 2,545 ft |
| July | 82.0 | 2,034 ft | 93.5 | 2,740 ft |
| August | 82.1 | 2,040 ft | 94.4 | 2,794 ft |
| September | 76.4 | 1,684 ft | 88.5 | 2,435 ft |
| October | 66.5 | 1,053 ft | 79.5 | 1,878 ft |
| November | 56.6 | 407 ft | 69.7 | 1,258 ft |
| December | 48.8 | −112 ft | 61.0 | 696 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 78R
DENSITY ALTITUDE
Field elevation 443 ft — the air behaves like 2,770 ft.
- PRESSURE ALT
- 444 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
- F17 — Center Municipal
Center · elev 319 ft
- T24 — Pineland Municipal
Pineland · elev 260 ft
- KOCH — Nacogdoches A L Mangham Jr Regional
Nacogdoches · elev 343 ft
- KLFK — Angelina County
Lufkin · elev 296 ft
- 4F2 — Panola County-Sharpe Field
Carthage · elev 248 ft
- KJAS — Jasper County/Bell Field
Jasper · elev 213 ft
- 61R — Newton Municipal
Newton · elev 322 ft
- 09R — Tyler County
Woodville · elev 388 ft
Frequently asked questions
How high does density altitude get at 78R in summer?
On a typical August afternoon — around 94 °F at the nearest NOAA normals station — density altitude at San Augustine County reaches roughly 2,794 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 78R on an average day?
It swings with the seasons: from roughly −207 ft at the coldest month's average temperature to about 2,040 ft at the warmest month's — all from a constant field elevation of 443 ft. The month-by-month table above carries the full year.
What is the field elevation of San Augustine County?
443 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 78R (FAA), in San Augustine, Texas.