Yates City, Illinois · field elev 661 ft
Density Altitude at Tri-County (2C6)
Tri-County sits at 661 ft, and even a typical July afternoon (84 °F) only lifts density altitude to about 2,399 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 | 23.0 | −1,630 ft | 31.6 | −1,021 ft |
| February | 27.1 | −1,338 ft | 36.1 | −708 ft |
| March | 38.6 | −535 ft | 48.8 | 158 ft |
| April | 50.5 | 272 ft | 61.5 | 997 ft |
| May | 61.4 | 991 ft | 72.0 | 1,672 ft |
| June | 70.9 | 1,603 ft | 81.2 | 2,251 ft |
| July | 74.1 | 1,806 ft | 83.6 | 2,399 ft |
| August | 72.3 | 1,692 ft | 82.0 | 2,300 ft |
| September | 65.4 | 1,250 ft | 76.3 | 1,944 ft |
| October | 52.8 | 425 ft | 63.8 | 1,147 ft |
| November | 40.0 | −439 ft | 49.3 | 191 ft |
| December | 28.5 | −1,239 ft | 36.4 | −687 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 2C6
DENSITY ALTITUDE
Field elevation 661 ft — the air behaves like 2,424 ft.
- PRESSURE ALT
- 662 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
- KCTK — Ingersoll
Canton · elev 684 ft
- KPIA — General Downing - Peoria International
Peoria · elev 661 ft
- KGBG — Harrel W Timmons Galesburg Regional
Galesburg · elev 764 ft
- 3MY — Mount Hawley Auxiliary
Peoria · elev 793 ft
- C15 — Pekin Municipal
Pekin · elev 530 ft
- KEZI — Kewanee Municipal
Kewanee · elev 858 ft
- C66 — Monmouth Municipal
Monmouth · elev 753 ft
- KMQB — Macomb Municipal
Macomb · elev 706 ft
Frequently asked questions
How high does density altitude get at 2C6 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Tri-County reaches roughly 2,399 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 2C6 on an average day?
It swings with the seasons: from roughly −1,630 ft at the coldest month's average temperature to about 1,806 ft at the warmest month's — all from a constant field elevation of 661 ft. The month-by-month table above carries the full year.
What is the field elevation of Tri-County?
661 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2C6 (FAA), in Yates City, Illinois.