Gonzales, Texas · field elev 354 ft
Density Altitude at Roger M Dreyer Meml (T20)
Roger M Dreyer Meml sits at 354 ft, and even a typical August afternoon (96 °F) only lifts density altitude to about 2,765 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 | 51.1 | −68 ft | 62.1 | 658 ft |
| February | 54.8 | 178 ft | 65.9 | 905 ft |
| March | 61.7 | 632 ft | 72.5 | 1,328 ft |
| April | 68.3 | 1,059 ft | 79.3 | 1,757 ft |
| May | 75.8 | 1,537 ft | 85.6 | 2,148 ft |
| June | 81.9 | 1,919 ft | 91.8 | 2,528 ft |
| July | 84.2 | 2,062 ft | 94.3 | 2,680 ft |
| August | 84.7 | 2,093 ft | 95.7 | 2,765 ft |
| September | 79.4 | 1,763 ft | 89.9 | 2,413 ft |
| October | 70.6 | 1,207 ft | 82.1 | 1,932 ft |
| November | 60.4 | 547 ft | 71.9 | 1,289 ft |
| December | 52.8 | 45 ft | 64.0 | 782 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 T20
DENSITY ALTITUDE
Field elevation 354 ft — the air behaves like 2,783 ft.
- PRESSURE ALT
- 355 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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- KHYI — San Marcos Regional
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- 84R — Smithville Crawford Municipal
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Frequently asked questions
How high does density altitude get at T20 in summer?
On a typical August afternoon — around 96 °F at the nearest NOAA normals station — density altitude at Roger M Dreyer Meml reaches roughly 2,765 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 T20 on an average day?
It swings with the seasons: from roughly −68 ft at the coldest month's average temperature to about 2,093 ft at the warmest month's — all from a constant field elevation of 354 ft. The month-by-month table above carries the full year.
What is the field elevation of Roger M Dreyer Meml?
354 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is T20 (FAA), in Gonzales, Texas.