Watson, Illinois · field elev 552 ft
Density Altitude at Percival Springs (2T2)
Percival Springs sits at 552 ft, and even a typical July afternoon (89 °F) only lifts density altitude to about 2,568 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 | 28.8 | −1,354 ft | 37.4 | −754 ft |
| February | 33.0 | −1,059 ft | 42.5 | −404 ft |
| March | 42.9 | −376 ft | 53.5 | 337 ft |
| April | 54.2 | 383 ft | 65.9 | 1,148 ft |
| May | 64.9 | 1,084 ft | 76.2 | 1,804 ft |
| June | 74.0 | 1,666 ft | 85.1 | 2,359 ft |
| July | 77.2 | 1,867 ft | 88.5 | 2,568 ft |
| August | 75.4 | 1,754 ft | 87.2 | 2,488 ft |
| September | 68.4 | 1,309 ft | 81.2 | 2,117 ft |
| October | 56.4 | 529 ft | 68.8 | 1,335 ft |
| November | 43.9 | −308 ft | 54.0 | 370 ft |
| December | 33.8 | −1,004 ft | 42.2 | −424 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 2T2
DENSITY ALTITUDE
Field elevation 552 ft — the air behaves like 2,599 ft.
- PRESSURE ALT
- 553 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
- 1H2 — Effingham County Regional
Effingham · elev 585 ft
- KFOA — Flora Municipal
Flora · elev 473 ft
- KOLY — Olney-Noble
Olney-Noble · elev 482 ft
- 2H0 — Shelby County
Shelbyville · elev 619 ft
- KVLA — Vandalia Municipal
Vandalia · elev 537 ft
- KSLO — Salem-Leckrone
Salem · elev 573 ft
- KMTO — Coles County Meml
Mattoon/Charleston · elev 722 ft
- 1H8 — Casey Municipal
Casey · elev 655 ft
Frequently asked questions
How high does density altitude get at 2T2 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Percival Springs reaches roughly 2,568 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 2T2 on an average day?
It swings with the seasons: from roughly −1,354 ft at the coldest month's average temperature to about 1,867 ft at the warmest month's — all from a constant field elevation of 552 ft. The month-by-month table above carries the full year.
What is the field elevation of Percival Springs?
552 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2T2 (FAA), in Watson, Illinois.