Monee, Illinois · field elev 790 ft
Density Altitude at Bult Field (C56)
Bult Field sits at 790 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,575 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 | 23.2 | −1,454 ft | 31.1 | −895 ft |
| February | 26.8 | −1,198 ft | 35.2 | −609 ft |
| March | 37.2 | −471 ft | 46.4 | 156 ft |
| April | 48.8 | 318 ft | 59.3 | 1,013 ft |
| May | 60.0 | 1,059 ft | 70.6 | 1,742 ft |
| June | 69.5 | 1,672 ft | 80.2 | 2,346 ft |
| July | 73.9 | 1,951 ft | 83.9 | 2,575 ft |
| August | 72.0 | 1,831 ft | 82.0 | 2,458 ft |
| September | 65.2 | 1,396 ft | 75.8 | 2,071 ft |
| October | 52.8 | 585 ft | 63.1 | 1,260 ft |
| November | 39.8 | −292 ft | 48.2 | 278 ft |
| December | 28.9 | −1,049 ft | 36.3 | −533 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 C56
DENSITY ALTITUDE
Field elevation 790 ft — the air behaves like 2,582 ft.
- PRESSURE ALT
- 791 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 Illinois fields
- KIGQ — Lansing Municipal
Chicago · elev 620 ft
- 3KK — Kankakee
Kankakee · elev 625 ft
- KIKK — Greater Kankakee
Kankakee · elev 630 ft
- KLOT — Lewis University
Chicago/Romeoville · elev 679 ft
- KJOT — Joliet Regional
Joliet · elev 582 ft
- KMDW — Chicago Midway International
Chicago · elev 620 ft
- 1C5 — Bolingbrook'S Clow International
Bolingbrook · elev 675 ft
- C09 — Morris Municipal/James R Washburn Field
Morris · elev 585 ft
Frequently asked questions
How high does density altitude get at C56 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Bult Field reaches roughly 2,575 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 C56 on an average day?
It swings with the seasons: from roughly −1,454 ft at the coldest month's average temperature to about 1,951 ft at the warmest month's — all from a constant field elevation of 790 ft. The month-by-month table above carries the full year.
What is the field elevation of Bult Field?
790 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is C56 (FAA), in Monee, Illinois.