Harvard, Illinois · field elev 913 ft
Density Altitude at Dacy (0C0)
Dacy sits at 913 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,701 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 | 20.9 | −1,464 ft | 29.2 | −875 ft |
| February | 24.5 | −1,207 ft | 33.2 | −595 ft |
| March | 35.4 | −442 ft | 44.9 | 208 ft |
| April | 47.4 | 376 ft | 58.6 | 1,119 ft |
| May | 58.7 | 1,125 ft | 70.2 | 1,867 ft |
| June | 68.6 | 1,765 ft | 79.9 | 2,478 ft |
| July | 72.6 | 2,019 ft | 83.5 | 2,701 ft |
| August | 70.7 | 1,899 ft | 81.8 | 2,596 ft |
| September | 63.6 | 1,444 ft | 75.4 | 2,196 ft |
| October | 51.2 | 630 ft | 62.4 | 1,366 ft |
| November | 38.0 | −263 ft | 46.9 | 343 ft |
| December | 26.5 | −1,065 ft | 34.5 | −504 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 0C0
DENSITY ALTITUDE
Field elevation 913 ft — the air behaves like 2,732 ft.
- PRESSURE ALT
- 914 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
- C77 — Poplar Grove
Poplar Grove · elev 857 ft
- 10C — Galt Field
Greenwood/Wonder Lake · elev 875 ft
- 3CK — Lake In The Hills
Chicago/Lake In The Hills · elev 887 ft
- 1C8 — Cottonwood
Rockford · elev 741 ft
- KRFD — Chicago/Rockford International
Chicago/Rockford · elev 742 ft
- C81 — Campbell
Grayslake · elev 788 ft
- KDKB — De Kalb Taylor Municipal
De Kalb · elev 913 ft
- KUGN — Waukegan Ntl
Chicago/Waukegan · elev 728 ft
Frequently asked questions
How high does density altitude get at 0C0 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Dacy reaches roughly 2,701 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 0C0 on an average day?
It swings with the seasons: from roughly −1,464 ft at the coldest month's average temperature to about 2,019 ft at the warmest month's — all from a constant field elevation of 913 ft. The month-by-month table above carries the full year.
What is the field elevation of Dacy?
913 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 0C0 (FAA), in Harvard, Illinois.