Greencastle, Indiana · field elev 842 ft
Density Altitude at Putnam County Regional (KGPC)
Putnam County Regional sits at 842 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,596 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 | 25.6 | −1,218 ft | 34.4 | −600 ft |
| February | 29.5 | −942 ft | 39.2 | −269 ft |
| March | 39.5 | −248 ft | 50.3 | 483 ft |
| April | 50.4 | 489 ft | 62.2 | 1,266 ft |
| May | 60.6 | 1,162 ft | 72.0 | 1,894 ft |
| June | 69.3 | 1,723 ft | 80.4 | 2,422 ft |
| July | 72.2 | 1,907 ft | 83.2 | 2,596 ft |
| August | 70.8 | 1,818 ft | 82.2 | 2,534 ft |
| September | 64.4 | 1,408 ft | 76.9 | 2,203 ft |
| October | 52.8 | 649 ft | 64.8 | 1,434 ft |
| November | 40.6 | −173 ft | 51.0 | 529 ft |
| December | 30.8 | −851 ft | 39.4 | −255 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 KGPC
DENSITY ALTITUDE
Field elevation 842 ft — the air behaves like 2,583 ft.
- PRESSURE ALT
- 843 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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Frequently asked questions
How high does density altitude get at KGPC in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Putnam County Regional reaches roughly 2,596 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 KGPC on an average day?
It swings with the seasons: from roughly −1,218 ft at the coldest month's average temperature to about 1,907 ft at the warmest month's — all from a constant field elevation of 842 ft. The month-by-month table above carries the full year.
What is the field elevation of Putnam County Regional?
842 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGPC (ICAO) / GPC (FAA), in Greencastle, Indiana.