Knox City, Texas · field elev 1,500 ft
Density Altitude at Harrison Field Of Knox City (F75)
Harrison Field Of Knox City sits at 1,500 ft, and even a typical July afternoon (97 °F) only lifts density altitude to about 4,239 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 | 44.9 | 936 ft | 58.3 | 1,823 ft |
| February | 48.7 | 1,190 ft | 62.4 | 2,089 ft |
| March | 56.8 | 1,725 ft | 70.7 | 2,619 ft |
| April | 65.0 | 2,256 ft | 80.1 | 3,207 ft |
| May | 73.7 | 2,808 ft | 86.5 | 3,600 ft |
| June | 81.4 | 3,287 ft | 93.6 | 4,030 ft |
| July | 84.8 | 3,496 ft | 97.1 | 4,239 ft |
| August | 84.0 | 3,447 ft | 96.7 | 4,215 ft |
| September | 76.3 | 2,971 ft | 88.9 | 3,746 ft |
| October | 66.4 | 2,345 ft | 81.0 | 3,263 ft |
| November | 54.4 | 1,568 ft | 67.7 | 2,428 ft |
| December | 45.7 | 990 ft | 58.6 | 1,842 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 F75
DENSITY ALTITUDE
Field elevation 1,500 ft — the air behaves like 4,233 ft.
- PRESSURE ALT
- 1,501 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
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- 60F — Seymour Municipal
Seymour · elev 1,344 ft
- F56 — Arledge Field
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- 72F — Throckmorton Municipal
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- 22F — Kent County
Jayton · elev 2,008 ft
- 3F6 — Dan E Richards Municipal
Paducah · elev 1,860 ft
Frequently asked questions
How high does density altitude get at F75 in summer?
On a typical July afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Harrison Field Of Knox City reaches roughly 4,239 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 F75 on an average day?
It swings with the seasons: from roughly 936 ft at the coldest month's average temperature to about 3,496 ft at the warmest month's — all from a constant field elevation of 1,500 ft. The month-by-month table above carries the full year.
What is the field elevation of Harrison Field Of Knox City?
1,500 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is F75 (FAA), in Knox City, Texas.