Angleton, Texas · field elev 21 ft
Density Altitude at Bailes (7R9)
Bailes sits at 21 ft, and even a typical August afternoon (92 °F) only lifts density altitude to about 2,111 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 | 55.6 | −181 ft | 64.3 | 391 ft |
| February | 59.2 | 57 ft | 67.5 | 598 ft |
| March | 64.1 | 378 ft | 71.8 | 874 ft |
| April | 69.3 | 714 ft | 76.9 | 1,198 ft |
| May | 76.7 | 1,186 ft | 83.6 | 1,618 ft |
| June | 81.7 | 1,500 ft | 88.6 | 1,927 ft |
| July | 83.6 | 1,618 ft | 91.0 | 2,074 ft |
| August | 83.9 | 1,637 ft | 91.6 | 2,111 ft |
| September | 80.8 | 1,443 ft | 88.3 | 1,909 ft |
| October | 73.0 | 951 ft | 81.9 | 1,512 ft |
| November | 64.2 | 384 ft | 73.1 | 957 ft |
| December | 58.6 | 18 ft | 67.2 | 579 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 7R9
DENSITY ALTITUDE
Field elevation 21 ft — the air behaves like 2,135 ft.
- PRESSURE ALT
- 22 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
- KLBX — Texas Gulf Coast Regional
Angleton/Lake Jackson · elev 25 ft
- 81D — Flyin Tiger
Angleton · elev 30 ft
- 6R5 — Alvin Airpark
Alvin · elev 43 ft
- 3T2 — Wolfe Air Park
Manvel · elev 55 ft
- KAXH — Houston/Southwest
Houston · elev 69 ft
- KLVJ — Pearland Regional
Houston · elev 44 ft
- T79 — Skyway Manor
Pearland · elev 55 ft
- KBYY — Bay City Regional
Bay City · elev 45 ft
Frequently asked questions
How high does density altitude get at 7R9 in summer?
On a typical August afternoon — around 92 °F at the nearest NOAA normals station — density altitude at Bailes reaches roughly 2,111 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 7R9 on an average day?
It swings with the seasons: from roughly −181 ft at the coldest month's average temperature to about 1,637 ft at the warmest month's — all from a constant field elevation of 21 ft. The month-by-month table above carries the full year.
What is the field elevation of Bailes?
21 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7R9 (FAA), in Angleton, Texas.