Gary/Chicago, Indiana · field elev 597 ft
Density Altitude at Gary/Chicago International (KGYY)
Gary/Chicago International sits at 597 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,197 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 | 24.9 | −1,575 ft | 32.1 | −1,066 ft |
| February | 28.3 | −1,333 ft | 35.5 | −829 ft |
| March | 37.7 | −677 ft | 45.6 | −137 ft |
| April | 48.4 | 52 ft | 57.2 | 637 ft |
| May | 59.0 | 755 ft | 68.4 | 1,364 ft |
| June | 68.5 | 1,371 ft | 77.5 | 1,941 ft |
| July | 73.0 | 1,657 ft | 81.6 | 2,197 ft |
| August | 71.6 | 1,569 ft | 80.0 | 2,098 ft |
| September | 65.3 | 1,165 ft | 74.3 | 1,740 ft |
| October | 53.5 | 392 ft | 62.3 | 971 ft |
| November | 41.5 | −416 ft | 48.7 | 72 ft |
| December | 30.8 | −1,157 ft | 37.4 | −698 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 KGYY
DENSITY ALTITUDE
Field elevation 597 ft — the air behaves like 2,222 ft.
- PRESSURE ALT
- 598 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
- 05C — Griffith-Merrillville
Griffith · elev 634 ft
- 3HO — Hobart Sky Ranch
Hobart · elev 630 ft
- KVPZ — Porter County Regional
Valparaiso · elev 770 ft
- C97 — Lowell
Lowell · elev 672 ft
- KMGC — Michigan City Municipal-Phillips Field
Michigan City · elev 655 ft
- C98 — Lake Village
Lake Village · elev 644 ft
- KPPO — La Porte Municipal
La Porte · elev 812 ft
- KOXI — Starke County
Knox · elev 685 ft
Frequently asked questions
How high does density altitude get at KGYY in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Gary/Chicago International reaches roughly 2,197 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 KGYY on an average day?
It swings with the seasons: from roughly −1,575 ft at the coldest month's average temperature to about 1,657 ft at the warmest month's — all from a constant field elevation of 597 ft. The month-by-month table above carries the full year.
What is the field elevation of Gary/Chicago International?
597 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KGYY (ICAO) / GYY (FAA), in Gary/Chicago, Indiana.