Sullivan, Indiana · field elev 539 ft
Density Altitude at Sullivan County (KSIV)
Sullivan County sits at 539 ft, and even a typical July afternoon (87 °F) only lifts density altitude to about 2,429 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 | 29.5 | −1,321 ft | 37.7 | −749 ft |
| February | 33.2 | −1,062 ft | 42.4 | −427 ft |
| March | 43.5 | −352 ft | 53.2 | 301 ft |
| April | 55.2 | 433 ft | 65.2 | 1,087 ft |
| May | 65.2 | 1,087 ft | 75.4 | 1,738 ft |
| June | 73.7 | 1,631 ft | 83.3 | 2,232 ft |
| July | 76.5 | 1,807 ft | 86.5 | 2,429 ft |
| August | 75.0 | 1,713 ft | 85.4 | 2,362 ft |
| September | 68.3 | 1,287 ft | 79.8 | 2,014 ft |
| October | 56.3 | 506 ft | 67.2 | 1,216 ft |
| November | 44.3 | −297 ft | 53.5 | 321 ft |
| December | 34.3 | −985 ft | 41.8 | −468 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 KSIV
DENSITY ALTITUDE
Field elevation 539 ft — the air behaves like 2,460 ft.
- PRESSURE ALT
- 540 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 Indiana fields
- I20 — Ed-Air
Oaktown · elev 426 ft
- 1I3 — Shawnee Field
Bloomfield · elev 501 ft
- KHUF — Terre Haute Regional
Terre Haute · elev 589 ft
- 3I3 — Sky King
Terre Haute · elev 496 ft
- 0I2 — Brazil Clay County/Charles B Hall Field
Brazil · elev 645 ft
- KDCY — Daviess County
Washington · elev 472 ft
- KBMG — Monroe County
Bloomington · elev 846 ft
- 78I — Pam'S Place
Eminence · elev 791 ft
Frequently asked questions
How high does density altitude get at KSIV in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Sullivan County reaches roughly 2,429 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 KSIV on an average day?
It swings with the seasons: from roughly −1,321 ft at the coldest month's average temperature to about 1,807 ft at the warmest month's — all from a constant field elevation of 539 ft. The month-by-month table above carries the full year.
What is the field elevation of Sullivan County?
539 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSIV (ICAO) / SIV (FAA), in Sullivan, Indiana.