Jacksboro, Texas · field elev 1,062 ft
Density Altitude at Jacksboro Municipal (21F)
Jacksboro Municipal sits at 1,062 ft, and even a typical August afternoon (96 °F) only lifts density altitude to about 3,630 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 | 42.5 | 230 ft | 55.4 | 1,093 ft |
| February | 46.6 | 507 ft | 59.4 | 1,355 ft |
| March | 54.8 | 1,053 ft | 67.8 | 1,897 ft |
| April | 62.7 | 1,569 ft | 75.8 | 2,404 ft |
| May | 71.4 | 2,126 ft | 83.2 | 2,864 ft |
| June | 79.3 | 2,622 ft | 91.0 | 3,341 ft |
| July | 83.6 | 2,889 ft | 95.7 | 3,624 ft |
| August | 83.3 | 2,870 ft | 95.8 | 3,630 ft |
| September | 75.4 | 2,379 ft | 87.9 | 3,152 ft |
| October | 64.5 | 1,685 ft | 77.6 | 2,516 ft |
| November | 53.1 | 941 ft | 65.7 | 1,762 ft |
| December | 44.5 | 366 ft | 56.8 | 1,185 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 21F
DENSITY ALTITUDE
Field elevation 1,062 ft — the air behaves like 3,642 ft.
- PRESSURE ALT
- 1,063 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
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- KMWL — Mineral Wells Regional
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- KLUD — Decatur Municipal
Decatur · elev 1,047 ft
- 0F2 — Bowie Municipal
Bowie · elev 1,101 ft
- 35X — Triple-Ace Field
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- T39 — Archer City Municipal
Archer City · elev 1,065 ft
Frequently asked questions
How high does density altitude get at 21F in summer?
On a typical August afternoon — around 96 °F at the nearest NOAA normals station — density altitude at Jacksboro Municipal reaches roughly 3,630 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 21F on an average day?
It swings with the seasons: from roughly 230 ft at the coldest month's average temperature to about 2,889 ft at the warmest month's — all from a constant field elevation of 1,062 ft. The month-by-month table above carries the full year.
What is the field elevation of Jacksboro Municipal?
1,062 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 21F (FAA), in Jacksboro, Texas.