Chicago/Waukegan, Illinois · field elev 728 ft
Density Altitude at Waukegan Ntl (KUGN)
Waukegan Ntl sits at 728 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,339 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 | 23.4 | −1,517 ft | 30.9 | −986 ft |
| February | 26.3 | −1,311 ft | 34.1 | −763 ft |
| March | 35.6 | −659 ft | 44.3 | −63 ft |
| April | 45.8 | 39 ft | 55.5 | 687 ft |
| May | 56.3 | 739 ft | 66.6 | 1,410 ft |
| June | 66.3 | 1,390 ft | 76.6 | 2,045 ft |
| July | 71.6 | 1,729 ft | 81.3 | 2,339 ft |
| August | 70.5 | 1,659 ft | 80.0 | 2,258 ft |
| September | 63.4 | 1,203 ft | 73.1 | 1,824 ft |
| October | 51.8 | 441 ft | 60.9 | 1,041 ft |
| November | 39.5 | −390 ft | 47.5 | 154 ft |
| December | 28.9 | −1,127 ft | 35.9 | −638 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 KUGN
DENSITY ALTITUDE
Field elevation 728 ft — the air behaves like 2,320 ft.
- PRESSURE ALT
- 729 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
- C81 — Campbell
Grayslake · elev 788 ft
- KPWK — Chicago Exec
Chicago/Prospect Heights/Wheeling · elev 645 ft
- 10C — Galt Field
Greenwood/Wonder Lake · elev 875 ft
- 3CK — Lake In The Hills
Chicago/Lake In The Hills · elev 887 ft
- KORD — Chicago O'Hare International
Chicago · elev 680 ft
- 06C — Schaumburg Regional
Chicago/Schaumburg · elev 801 ft
- 0C0 — Dacy
Harvard · elev 913 ft
- KDPA — Dupage
Chicago/West Chicago · elev 759 ft
Frequently asked questions
How high does density altitude get at KUGN in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Waukegan Ntl reaches roughly 2,339 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 KUGN on an average day?
It swings with the seasons: from roughly −1,517 ft at the coldest month's average temperature to about 1,729 ft at the warmest month's — all from a constant field elevation of 728 ft. The month-by-month table above carries the full year.
What is the field elevation of Waukegan Ntl?
728 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KUGN (ICAO) / UGN (FAA), in Chicago/Waukegan, Illinois.