St Ignatius, Montana · field elev 3,006 ft
Density Altitude at St Ignatius (52S)
From a field elevation of 3,006 ft, a typical July afternoon at St Ignatius (86 °F) raises density altitude to about 5,401 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 | 29.7 | 1,773 ft | 36.8 | 2,258 ft |
| February | 31.1 | 1,869 ft | 39.9 | 2,467 ft |
| March | 39.3 | 2,427 ft | 50.6 | 3,177 ft |
| April | 46.7 | 2,920 ft | 59.4 | 3,747 ft |
| May | 54.8 | 3,451 ft | 68.6 | 4,331 ft |
| June | 60.9 | 3,843 ft | 75.1 | 4,735 ft |
| July | 69.1 | 4,362 ft | 86.0 | 5,401 ft ▲ |
| August | 68.3 | 4,312 ft | 85.8 | 5,389 ft ▲ |
| September | 59.4 | 3,747 ft | 74.8 | 4,717 ft |
| October | 47.0 | 2,940 ft | 59.3 | 3,741 ft |
| November | 36.1 | 2,211 ft | 44.8 | 2,795 ft |
| December | 29.5 | 1,759 ft | 36.5 | 2,238 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 52S
DENSITY ALTITUDE caution
Field elevation 3,006 ft — the air behaves like 5,401 ft.
- PRESSURE ALT
- 3,008 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
- 7S0 — Ronan
Ronan · elev 3,086 ft
- S04 — Condon Usfs
Condon · elev 3,686 ft
- 8S1 — Polson
Polson · elev 2,941 ft
- KMSO — Missoula Montana
Missoula · elev 3,206 ft
- 23S — Seeley Lake
Seeley Lake · elev 4,256 ft
- S09 — Hot Springs
Hot Springs · elev 2,763 ft
- 9S4 — Mineral County
Superior · elev 2,787 ft
- S34 — Plains
Plains · elev 2,467 ft
Frequently asked questions
How high does density altitude get at 52S in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at St Ignatius reaches roughly 5,401 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 52S on an average day?
It swings with the seasons: from roughly 1,759 ft at the coldest month's average temperature to about 4,362 ft at the warmest month's — all from a constant field elevation of 3,006 ft. The month-by-month table above carries the full year.
What is the field elevation of St Ignatius?
3,006 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 52S (FAA), in St Ignatius, Montana.