Mattoon/Charleston, Illinois · field elev 722 ft
Density Altitude at Coles County Meml (KMTO)
Coles County Meml sits at 722 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,597 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 | 27.8 | −1,212 ft | 35.4 | −680 ft |
| February | 32.0 | −917 ft | 40.3 | −343 ft |
| March | 42.6 | −186 ft | 52.2 | 461 ft |
| April | 53.6 | 554 ft | 64.0 | 1,235 ft |
| May | 63.9 | 1,228 ft | 73.9 | 1,868 ft |
| June | 72.8 | 1,798 ft | 82.7 | 2,418 ft |
| July | 75.7 | 1,981 ft | 85.6 | 2,597 ft |
| August | 73.9 | 1,868 ft | 84.2 | 2,511 ft |
| September | 67.4 | 1,454 ft | 78.7 | 2,169 ft |
| October | 55.6 | 686 ft | 65.9 | 1,357 ft |
| November | 42.9 | −165 ft | 51.3 | 401 ft |
| December | 33.0 | −847 ft | 40.0 | −363 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 KMTO
DENSITY ALTITUDE
Field elevation 722 ft — the air behaves like 2,622 ft.
- PRESSURE ALT
- 723 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
- 1H8 — Casey Municipal
Casey · elev 655 ft
- K96 — Tuscola
Tuscola · elev 665 ft
- 2H0 — Shelby County
Shelbyville · elev 619 ft
- 1H2 — Effingham County Regional
Effingham · elev 585 ft
- 2T2 — Percival Springs
Watson · elev 552 ft
- KPRG — Edgar County
Paris · elev 654 ft
- KCMI — University Of Illinois/Willard
Champaign/Urbana · elev 755 ft
- KDEC — Decatur
Decatur · elev 682 ft
Frequently asked questions
How high does density altitude get at KMTO in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Coles County Meml reaches roughly 2,597 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 KMTO on an average day?
It swings with the seasons: from roughly −1,212 ft at the coldest month's average temperature to about 1,981 ft at the warmest month's — all from a constant field elevation of 722 ft. The month-by-month table above carries the full year.
What is the field elevation of Coles County Meml?
722 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMTO (ICAO) / MTO (FAA), in Mattoon/Charleston, Illinois.