Sioux City, Iowa · field elev 1,099 ft
Density Altitude at Sioux Gateway/Brig General Bud Day Field (KSUX)
Sioux Gateway/Brig General Bud Day Field sits at 1,099 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 3,063 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 | 19.2 | −1,353 ft | 29.7 | −607 ft |
| February | 23.5 | −1,045 ft | 34.6 | −266 ft |
| March | 35.6 | −196 ft | 47.4 | 607 ft |
| April | 47.7 | 627 ft | 60.7 | 1,485 ft |
| May | 59.4 | 1,400 ft | 71.6 | 2,184 ft |
| June | 70.0 | 2,083 ft | 82.1 | 2,841 ft |
| July | 74.5 | 2,367 ft | 85.7 | 3,063 ft |
| August | 72.0 | 2,210 ft | 83.0 | 2,897 ft |
| September | 64.1 | 1,705 ft | 77.3 | 2,543 ft |
| October | 50.6 | 821 ft | 63.8 | 1,686 ft |
| November | 35.8 | −183 ft | 47.3 | 600 ft |
| December | 23.8 | −1,024 ft | 33.9 | −314 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 KSUX
DENSITY ALTITUDE
Field elevation 1,099 ft — the air behaves like 3,081 ft.
- PRESSURE ALT
- 1,100 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 Iowa fields
- KLRJ — Le Mars Municipal
Le Mars · elev 1,197 ft
- KMEY — James G Whiting Meml Field
Mapleton · elev 1,116 ft
- KSXK — Sioux County Regional
Maurice · elev 1,409 ft
- KCKP — Cherokee County Regional
Cherokee · elev 1,227 ft
- KIDG — Ida Grove Municipal
Ida Grove · elev 1,245 ft
- 1Y9 — Paullina Municipal
Paullina · elev 1,385 ft
- 3Y4 — Woodbine Municipal
Woodbine · elev 1,068 ft
- KDNS — Denison Municipal
Denison · elev 1,274 ft
Frequently asked questions
How high does density altitude get at KSUX in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Sioux Gateway/Brig General Bud Day Field reaches roughly 3,063 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 KSUX on an average day?
It swings with the seasons: from roughly −1,353 ft at the coldest month's average temperature to about 2,367 ft at the warmest month's — all from a constant field elevation of 1,099 ft. The month-by-month table above carries the full year.
What is the field elevation of Sioux Gateway/Brig General Bud Day Field?
1,099 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KSUX (ICAO) / SUX (FAA), in Sioux City, Iowa.