Sherman/Denison, Texas · field elev 749 ft
Density Altitude at North Texas Regional/Perrin Field (KGYI)
North Texas Regional/Perrin Field sits at 749 ft, and even a typical August afternoon (93 °F) only lifts density altitude to about 3,063 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 | 43.2 | −111 ft | 52.6 | 521 ft |
| February | 47.1 | 153 ft | 57.1 | 818 ft |
| March | 55.1 | 686 ft | 65.2 | 1,345 ft |
| April | 62.7 | 1,184 ft | 72.6 | 1,818 ft |
| May | 70.8 | 1,704 ft | 80.0 | 2,283 ft |
| June | 78.9 | 2,215 ft | 88.1 | 2,784 ft |
| July | 83.0 | 2,470 ft | 92.5 | 3,051 ft |
| August | 82.8 | 2,457 ft | 92.7 | 3,063 ft |
| September | 75.8 | 2,021 ft | 85.4 | 2,618 ft |
| October | 65.2 | 1,345 ft | 75.3 | 1,989 ft |
| November | 53.7 | 594 ft | 63.3 | 1,223 ft |
| December | 45.1 | 18 ft | 54.2 | 627 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 KGYI
DENSITY ALTITUDE
Field elevation 749 ft — the air behaves like 3,082 ft.
- PRESSURE ALT
- 750 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- WATER · GRAINS/LB
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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
- KSWI — Sherman Municipal
Sherman · elev 746 ft
- 3T0 — Cedar Mills
Gordonville · elev 640 ft
- X65 — Txaerosport Aerodrome
Dorchester · elev 855 ft
- T47 — Finney Field
Howe · elev 833 ft
- T29 — Flying H Ranch
Whitesboro · elev 760 ft
- T32 — Sudden Stop
Collinsville · elev 720 ft
- T80 — Bishop'S Landing
Celina · elev 750 ft
- 9S1 — Four Winds
Celina · elev 790 ft
Frequently asked questions
How high does density altitude get at KGYI in summer?
On a typical August afternoon — around 93 °F at the nearest NOAA normals station — density altitude at North Texas Regional/Perrin Field reaches roughly 3,063 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 KGYI on an average day?
It swings with the seasons: from roughly −111 ft at the coldest month's average temperature to about 2,470 ft at the warmest month's — all from a constant field elevation of 749 ft. The month-by-month table above carries the full year.
What is the field elevation of North Texas Regional/Perrin Field?
749 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGYI (ICAO) / GYI (FAA), in Sherman/Denison, Texas.