Groveton, Texas · field elev 340 ft
Density Altitude at Groveton/Trinity County (33R)
Groveton/Trinity County sits at 340 ft, and even a typical August afternoon (97 °F) only lifts density altitude to about 2,796 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 | 50.2 | −146 ft | 62.2 | 647 ft |
| February | 54.6 | 148 ft | 66.7 | 939 ft |
| March | 60.4 | 530 ft | 73.4 | 1,368 ft |
| April | 68.2 | 1,036 ft | 81.5 | 1,877 ft |
| May | 75.5 | 1,501 ft | 87.4 | 2,242 ft |
| June | 81.4 | 1,871 ft | 92.5 | 2,554 ft |
| July | 84.0 | 2,032 ft | 95.7 | 2,748 ft |
| August | 84.3 | 2,051 ft | 96.5 | 2,796 ft |
| September | 79.2 | 1,733 ft | 91.7 | 2,505 ft |
| October | 69.3 | 1,106 ft | 83.7 | 2,014 ft |
| November | 59.0 | 438 ft | 71.3 | 1,234 ft |
| December | 51.9 | −32 ft | 63.9 | 758 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 33R
DENSITY ALTITUDE
Field elevation 340 ft — the air behaves like 2,826 ft.
- PRESSURE ALT
- 341 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
- KDKR — Houston County
Crockett · elev 348 ft
- KLFK — Angelina County
Lufkin · elev 296 ft
- 00R — Livingston Municipal
Livingston · elev 151 ft
- KUTS — Huntsville Municipal
Huntsville · elev 363 ft
- KOCH — Nacogdoches A L Mangham Jr Regional
Nacogdoches · elev 343 ft
- 09R — Tyler County
Woodville · elev 388 ft
- 51R — Madisonville Municipal
Madisonville · elev 286 ft
- 6R3 — Cleveland Municipal
Cleveland · elev 150 ft
Frequently asked questions
How high does density altitude get at 33R in summer?
On a typical August afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Groveton/Trinity County reaches roughly 2,796 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 33R on an average day?
It swings with the seasons: from roughly −146 ft at the coldest month's average temperature to about 2,051 ft at the warmest month's — all from a constant field elevation of 340 ft. The month-by-month table above carries the full year.
What is the field elevation of Groveton/Trinity County?
340 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 33R (FAA), in Groveton, Texas.