Fredericksburg, Texas · field elev 1,695 ft
Density Altitude at Gillespie County (T82)
Gillespie County sits at 1,695 ft, and even a typical August afternoon (94 °F) only lifts density altitude to about 4,302 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 | 47.0 | 1,318 ft | 59.8 | 2,161 ft |
| February | 51.2 | 1,598 ft | 63.8 | 2,418 ft |
| March | 58.3 | 2,063 ft | 70.7 | 2,858 ft |
| April | 65.6 | 2,534 ft | 78.0 | 3,315 ft |
| May | 73.3 | 3,021 ft | 84.0 | 3,685 ft |
| June | 79.4 | 3,402 ft | 90.3 | 4,068 ft |
| July | 82.1 | 3,568 ft | 93.4 | 4,254 ft |
| August | 82.2 | 3,574 ft | 94.2 | 4,302 ft |
| September | 76.0 | 3,190 ft | 87.9 | 3,923 ft |
| October | 66.7 | 2,604 ft | 79.1 | 3,383 ft |
| November | 56.1 | 1,920 ft | 68.2 | 2,699 ft |
| December | 48.6 | 1,425 ft | 61.4 | 2,264 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 T82
DENSITY ALTITUDE
Field elevation 1,695 ft — the air behaves like 4,290 ft.
- PRESSURE ALT
- 1,696 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
- KERV — Kerrville Municipal/Louis Schreiner Field
Kerrville · elev 1,617 ft
- T92 — Mason County
Mason · elev 1,514 ft
- 5C1 — Boerne Stage Airfield
San Antonio · elev 1,384 ft
- KDZB — Horseshoe Bay Resort
Horseshoe Bay · elev 1,093 ft
- 2KL — Sunrise Beach
Sunrise Beach Village · elev 854 ft
- 2G5 — Granite Shoals/ Bob Sylvester Airpark
Granite Shoals · elev 860 ft
- KAQO — Llano Municipal
Llano · elev 1,102 ft
- 1T7 — Kestrel Airpark
San Antonio · elev 1,261 ft
Frequently asked questions
How high does density altitude get at T82 in summer?
On a typical August afternoon — around 94 °F at the nearest NOAA normals station — density altitude at Gillespie County reaches roughly 4,302 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 T82 on an average day?
It swings with the seasons: from roughly 1,318 ft at the coldest month's average temperature to about 3,574 ft at the warmest month's — all from a constant field elevation of 1,695 ft. The month-by-month table above carries the full year.
What is the field elevation of Gillespie County?
1,695 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is T82 (FAA), in Fredericksburg, Texas.