Hillsboro, Texas · field elev 686 ft
Density Altitude at Hillsboro Municipal (KINJ)
Hillsboro Municipal sits at 686 ft, and even a typical August afternoon (97 °F) only lifts density altitude to about 3,246 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 | 46.5 | 34 ft | 59.0 | 865 ft |
| February | 50.3 | 289 ft | 62.7 | 1,106 ft |
| March | 57.2 | 747 ft | 69.5 | 1,544 ft |
| April | 65.1 | 1,261 ft | 77.1 | 2,025 ft |
| May | 73.1 | 1,773 ft | 84.1 | 2,461 ft |
| June | 80.8 | 2,256 ft | 91.5 | 2,914 ft |
| July | 84.4 | 2,479 ft | 96.0 | 3,186 ft |
| August | 84.9 | 2,510 ft | 97.0 | 3,246 ft |
| September | 78.3 | 2,100 ft | 90.5 | 2,853 ft |
| October | 67.8 | 1,435 ft | 80.3 | 2,225 ft |
| November | 56.3 | 688 ft | 68.8 | 1,499 ft |
| December | 48.2 | 149 ft | 60.4 | 956 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 KINJ
DENSITY ALTITUDE
Field elevation 686 ft — the air behaves like 3,246 ft.
- PRESSURE ALT
- 687 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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- 73F — Wings For Christ International Flt Academy
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Frequently asked questions
How high does density altitude get at KINJ in summer?
On a typical August afternoon — around 97 °F at the nearest NOAA normals station — density altitude at Hillsboro Municipal reaches roughly 3,246 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 KINJ on an average day?
It swings with the seasons: from roughly 34 ft at the coldest month's average temperature to about 2,510 ft at the warmest month's — all from a constant field elevation of 686 ft. The month-by-month table above carries the full year.
What is the field elevation of Hillsboro Municipal?
686 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KINJ (ICAO) / INJ (FAA), in Hillsboro, Texas.