Peru, Indiana · field elev 811 ft
Density Altitude at Grissom Arb (KGUS)
Grissom Arb sits at 811 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,521 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 | 24.2 | −1,356 ft | 31.9 | −813 ft |
| February | 27.8 | −1,101 ft | 35.9 | −535 ft |
| March | 37.9 | −397 ft | 47.3 | 243 ft |
| April | 49.4 | 384 ft | 60.4 | 1,111 ft |
| May | 61.1 | 1,156 ft | 71.8 | 1,844 ft |
| June | 70.0 | 1,729 ft | 80.3 | 2,378 ft |
| July | 72.3 | 1,875 ft | 82.6 | 2,521 ft |
| August | 70.6 | 1,767 ft | 81.2 | 2,434 ft |
| September | 64.3 | 1,364 ft | 76.5 | 2,140 ft |
| October | 53.0 | 624 ft | 64.2 | 1,357 ft |
| November | 40.4 | −225 ft | 49.1 | 364 ft |
| December | 29.9 | −953 ft | 36.9 | −466 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 KGUS
DENSITY ALTITUDE
Field elevation 811 ft — the air behaves like 2,545 ft.
- PRESSURE ALT
- 812 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 Indiana fields
- 5I6 — Galveston
Galveston · elev 786 ft
- I76 — Peru Municipal
Peru · elev 779 ft
- KOKK — Kokomo Municipal
Kokomo · elev 832 ft
- KGGP — Logansport/Cass County
Logansport · elev 738 ft
- 1I8 — Converse
Converse · elev 840 ft
- 8I3 — Glenndale
Kokomo · elev 850 ft
- KIWH — Wabash Municipal
Wabash · elev 796 ft
- 5I2 — Flora Municipal
Flora · elev 710 ft
Frequently asked questions
How high does density altitude get at KGUS in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Grissom Arb reaches roughly 2,521 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 KGUS on an average day?
It swings with the seasons: from roughly −1,356 ft at the coldest month's average temperature to about 1,875 ft at the warmest month's — all from a constant field elevation of 811 ft. The month-by-month table above carries the full year.
What is the field elevation of Grissom Arb?
811 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGUS (ICAO) / GUS (FAA), in Peru, Indiana.