North Sioux City, South Dakota · field elev 1,109 ft
Density Altitude at Graham Field (7K7)
Graham Field sits at 1,109 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 3,075 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 | −1,340 ft | 29.7 | −594 ft |
| February | 23.5 | −1,032 ft | 34.6 | −253 ft |
| March | 35.6 | −184 ft | 47.4 | 619 ft |
| April | 47.7 | 639 ft | 60.7 | 1,497 ft |
| May | 59.4 | 1,413 ft | 71.6 | 2,196 ft |
| June | 70.0 | 2,095 ft | 82.1 | 2,853 ft |
| July | 74.5 | 2,379 ft | 85.7 | 3,075 ft |
| August | 72.0 | 2,222 ft | 83.0 | 2,909 ft |
| September | 64.1 | 1,717 ft | 77.3 | 2,555 ft |
| October | 50.6 | 833 ft | 63.8 | 1,698 ft |
| November | 35.8 | −170 ft | 47.3 | 613 ft |
| December | 23.8 | −1,011 ft | 33.9 | −302 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 7K7
DENSITY ALTITUDE
Field elevation 1,109 ft — the air behaves like 3,093 ft.
- PRESSURE ALT
- 1,110 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 South Dakota fields
- KVMR — Harold Davidson Field
Vermillion · elev 1,147 ft
- KYKN — Chan Gurney Municipal
Yankton · elev 1,306 ft
- 7G9 — Canton Municipal
Canton · elev 1,290 ft
- Y14 — Marv Skie-Lincoln County
Tea · elev 1,511 ft
- KFSD — Joe Foss Field
Sioux Falls · elev 1,430 ft
- Y03 — Springfield Municipal
Springfield · elev 1,324 ft
- 8V3 — Parkston Municipal
Parkston · elev 1,418 ft
- KAGZ — Wagner Municipal
Wagner · elev 1,478 ft
Frequently asked questions
How high does density altitude get at 7K7 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Graham Field reaches roughly 3,075 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 7K7 on an average day?
It swings with the seasons: from roughly −1,340 ft at the coldest month's average temperature to about 2,379 ft at the warmest month's — all from a constant field elevation of 1,109 ft. The month-by-month table above carries the full year.
What is the field elevation of Graham Field?
1,109 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7K7 (FAA), in North Sioux City, South Dakota.