Grayslake, Illinois · field elev 788 ft
Density Altitude at Campbell (C81)
Campbell sits at 788 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,462 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 | 21.2 | −1,600 ft | 28.9 | −1,052 ft |
| February | 24.6 | −1,356 ft | 32.9 | −772 ft |
| March | 35.0 | −626 ft | 44.2 | 5 ft |
| April | 46.3 | 147 ft | 56.5 | 827 ft |
| May | 57.7 | 906 ft | 68.0 | 1,573 ft |
| June | 67.8 | 1,560 ft | 77.9 | 2,200 ft |
| July | 72.2 | 1,841 ft | 82.1 | 2,462 ft |
| August | 70.8 | 1,752 ft | 80.7 | 2,375 ft |
| September | 63.3 | 1,271 ft | 73.7 | 1,936 ft |
| October | 51.1 | 469 ft | 60.8 | 1,108 ft |
| November | 38.3 | −398 ft | 46.6 | 167 ft |
| December | 26.9 | −1,193 ft | 34.2 | −681 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 C81
DENSITY ALTITUDE
Field elevation 788 ft — the air behaves like 2,455 ft.
- PRESSURE ALT
- 789 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
- KUGN — Waukegan Ntl
Chicago/Waukegan · elev 728 ft
- 3CK — Lake In The Hills
Chicago/Lake In The Hills · elev 887 ft
- 10C — Galt Field
Greenwood/Wonder Lake · elev 875 ft
- KPWK — Chicago Exec
Chicago/Prospect Heights/Wheeling · elev 645 ft
- 06C — Schaumburg Regional
Chicago/Schaumburg · elev 801 ft
- KORD — Chicago O'Hare International
Chicago · elev 680 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 C81 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Campbell reaches roughly 2,462 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 C81 on an average day?
It swings with the seasons: from roughly −1,600 ft at the coldest month's average temperature to about 1,841 ft at the warmest month's — all from a constant field elevation of 788 ft. The month-by-month table above carries the full year.
What is the field elevation of Campbell?
788 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is C81 (FAA), in Grayslake, Illinois.