Alpine, Texas · field elev 3,769 ft
Density Altitude at Terlingua Ranch (1E2)
From a field elevation of 3,769 ft, a typical June afternoon at Terlingua Ranch (95 °F) raises density altitude to about 6,884 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 49.0 | 4,013 ft | 63.2 | 4,925 ft |
| February | 52.9 | 4,267 ft | 67.4 | 5,189 ft ▲ |
| March | 59.8 | 4,710 ft | 75.5 | 5,690 ft ▲ |
| April | 67.6 | 5,201 ft | 83.6 | 6,183 ft ▲ |
| May | 75.9 | 5,715 ft | 91.1 | 6,630 ft ▲ |
| June | 81.1 | 6,032 ft | 95.4 | 6,884 ft ▲ |
| July | 81.1 | 6,032 ft | 94.0 | 6,801 ft ▲ |
| August | 79.8 | 5,953 ft | 92.6 | 6,719 ft ▲ |
| September | 75.2 | 5,672 ft | 88.5 | 6,476 ft ▲ |
| October | 66.7 | 5,145 ft | 81.0 | 6,026 ft ▲ |
| November | 56.5 | 4,499 ft | 71.0 | 5,413 ft ▲ |
| December | 49.4 | 4,040 ft | 63.0 | 4,913 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 1E2
DENSITY ALTITUDE caution
Field elevation 3,769 ft — the air behaves like 6,860 ft.
- PRESSURE ALT
- 3,771 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
- T89 — Lajitas International
Lajitas · elev 2,630 ft
- 3T9 — Big Bend Ranch State Park
Presidio · elev 4,250 ft
- KPRS — Presidio Lely International
Presidio · elev 2,938 ft
- E38 — Alpine-Casparis Municipal
Alpine · elev 4,514 ft
- KMRF — Marfa Municipal
Marfa · elev 4,849 ft
- 6R6 — Terrell County
Dryden · elev 2,323 ft
- KFST — Fort Stockton-Pecos County
Fort Stockton · elev 3,011 ft
- KPEQ — Pecos Municipal
Pecos · elev 2,613 ft
Frequently asked questions
How high does density altitude get at 1E2 in summer?
On a typical June afternoon — around 95 °F at the nearest NOAA normals station — density altitude at Terlingua Ranch reaches roughly 6,884 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 1E2 on an average day?
It swings with the seasons: from roughly 4,013 ft at the coldest month's average temperature to about 6,032 ft at the warmest month's — all from a constant field elevation of 3,769 ft. The month-by-month table above carries the full year.
What is the field elevation of Terlingua Ranch?
3,769 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1E2 (FAA), in Alpine, Texas.