Joliet, Illinois · field elev 582 ft
Density Altitude at Joliet Regional (KJOT)
Joliet Regional sits at 582 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,303 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 | 23.9 | −1,665 ft | 31.1 | −1,155 ft |
| February | 27.6 | −1,402 ft | 35.4 | −855 ft |
| March | 38.1 | −668 ft | 47.0 | −61 ft |
| April | 49.4 | 100 ft | 59.9 | 796 ft |
| May | 60.2 | 815 ft | 71.0 | 1,512 ft |
| June | 70.1 | 1,455 ft | 80.3 | 2,098 ft |
| July | 73.9 | 1,696 ft | 83.6 | 2,303 ft |
| August | 72.3 | 1,595 ft | 81.8 | 2,191 ft |
| September | 65.7 | 1,172 ft | 76.2 | 1,841 ft |
| October | 53.3 | 361 ft | 63.3 | 1,017 ft |
| November | 40.4 | −510 ft | 48.5 | 40 ft |
| December | 29.4 | −1,274 ft | 36.4 | −786 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 KJOT
DENSITY ALTITUDE
Field elevation 582 ft — the air behaves like 2,328 ft.
- PRESSURE ALT
- 583 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
- KLOT — Lewis University
Chicago/Romeoville · elev 679 ft
- 1C5 — Bolingbrook'S Clow International
Bolingbrook · elev 675 ft
- C09 — Morris Municipal/James R Washburn Field
Morris · elev 585 ft
- 0C8 — Cushing Field Ltd
Newark · elev 640 ft
- KARR — Aurora Municipal
Chicago/Aurora · elev 712 ft
- KDPA — Dupage
Chicago/West Chicago · elev 759 ft
- C56 — Bult Field
Monee · elev 790 ft
- KMDW — Chicago Midway International
Chicago · elev 620 ft
Frequently asked questions
How high does density altitude get at KJOT in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Joliet Regional reaches roughly 2,303 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 KJOT on an average day?
It swings with the seasons: from roughly −1,665 ft at the coldest month's average temperature to about 1,696 ft at the warmest month's — all from a constant field elevation of 582 ft. The month-by-month table above carries the full year.
What is the field elevation of Joliet Regional?
582 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KJOT (ICAO) / JOT (FAA), in Joliet, Illinois.