Lincoln, Illinois · field elev 594 ft
Density Altitude at Logan County (KAAA)
Logan County sits at 594 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 2,435 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 | 26.1 | −1,493 ft | 34.5 | −902 ft |
| February | 30.6 | −1,175 ft | 39.5 | −557 ft |
| March | 41.4 | −427 ft | 51.7 | 269 ft |
| April | 52.6 | 329 ft | 64.4 | 1,103 ft |
| May | 63.6 | 1,051 ft | 74.8 | 1,768 ft |
| June | 72.3 | 1,609 ft | 83.3 | 2,299 ft |
| July | 74.6 | 1,755 ft | 85.5 | 2,435 ft |
| August | 72.6 | 1,628 ft | 84.0 | 2,342 ft |
| September | 66.3 | 1,226 ft | 79.2 | 2,044 ft |
| October | 54.1 | 428 ft | 66.3 | 1,226 ft |
| November | 41.7 | −406 ft | 51.4 | 249 ft |
| December | 31.1 | −1,140 ft | 39.2 | −577 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 KAAA
DENSITY ALTITUDE
Field elevation 594 ft — the air behaves like 2,466 ft.
- PRESSURE ALT
- 595 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
- KSPI — Abraham Lincoln Capital
Springfield · elev 598 ft
- C15 — Pekin Municipal
Pekin · elev 530 ft
- KBMI — Central Il Regional/Bloomington-Normal
Bloomington/Normal · elev 871 ft
- KDEC — Decatur
Decatur · elev 682 ft
- 9I0 — Havana Regional
Havana · elev 488 ft
- KPIA — General Downing - Peoria International
Peoria · elev 661 ft
- KTAZ — Taylorville Municipal
Taylorville · elev 622 ft
- 3MY — Mount Hawley Auxiliary
Peoria · elev 793 ft
Frequently asked questions
How high does density altitude get at KAAA in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Logan County reaches roughly 2,435 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 KAAA on an average day?
It swings with the seasons: from roughly −1,493 ft at the coldest month's average temperature to about 1,755 ft at the warmest month's — all from a constant field elevation of 594 ft. The month-by-month table above carries the full year.
What is the field elevation of Logan County?
594 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KAAA (ICAO) / AAA (FAA), in Lincoln, Illinois.