Superior, Montana · field elev 2,787 ft
Density Altitude at Mineral County (9S4)
From a field elevation of 2,787 ft, a typical July afternoon at Mineral County (89 °F) raises density altitude to about 5,285 ft — solidly into the range where performance charts deserve a close read.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 28.6 | 1,424 ft | 35.8 | 1,918 ft |
| February | 32.1 | 1,665 ft | 42.0 | 2,337 ft |
| March | 40.0 | 2,202 ft | 52.6 | 3,038 ft |
| April | 46.5 | 2,636 ft | 60.7 | 3,561 ft |
| May | 55.3 | 3,213 ft | 70.8 | 4,201 ft |
| June | 61.6 | 3,619 ft | 77.5 | 4,616 ft |
| July | 69.6 | 4,125 ft | 88.5 | 5,285 ft ▲ |
| August | 68.8 | 4,075 ft | 88.2 | 5,267 ft ▲ |
| September | 59.5 | 3,485 ft | 77.2 | 4,598 ft |
| October | 47.2 | 2,683 ft | 60.5 | 3,549 ft |
| November | 34.9 | 1,857 ft | 42.9 | 2,397 ft |
| December | 27.8 | 1,368 ft | 34.0 | 1,795 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 9S4
DENSITY ALTITUDE caution
Field elevation 2,787 ft — the air behaves like 5,315 ft.
- PRESSURE ALT
- 2,789 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 Montana fields
- S34 — Plains
Plains · elev 2,467 ft
- S09 — Hot Springs
Hot Springs · elev 2,763 ft
- KTHM — Thompson Falls
Thompson Falls · elev 2,467 ft
- 52S — St Ignatius
St Ignatius · elev 3,006 ft
- KMSO — Missoula Montana
Missoula · elev 3,206 ft
- 7S0 — Ronan
Ronan · elev 3,086 ft
- 8S1 — Polson
Polson · elev 2,941 ft
- 32S — Stevensville
Stevensville · elev 3,614 ft
Frequently asked questions
How high does density altitude get at 9S4 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Mineral County reaches roughly 5,285 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 9S4 on an average day?
It swings with the seasons: from roughly 1,368 ft at the coldest month's average temperature to about 4,125 ft at the warmest month's — all from a constant field elevation of 2,787 ft. The month-by-month table above carries the full year.
What is the field elevation of Mineral County?
2,787 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 9S4 (FAA), in Superior, Montana.