Choteau, Montana · field elev 3,947 ft
Density Altitude at Choteau (KCII)
From a field elevation of 3,947 ft, a typical July afternoon at Choteau (82 °F) raises density altitude to about 6,302 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 | 25.4 | 2,649 ft | 37.4 | 3,466 ft |
| February | 26.5 | 2,724 ft | 38.9 | 3,566 ft |
| March | 34.0 | 3,237 ft | 47.0 | 4,102 ft |
| April | 42.4 | 3,799 ft | 55.8 | 4,673 ft |
| May | 51.1 | 4,370 ft | 65.1 | 5,263 ft ▲ |
| June | 58.2 | 4,826 ft | 72.3 | 5,711 ft ▲ |
| July | 65.2 | 5,269 ft | 82.0 | 6,302 ft ▲ |
| August | 64.0 | 5,194 ft | 81.0 | 6,242 ft ▲ |
| September | 55.7 | 4,666 ft | 71.6 | 5,667 ft ▲ |
| October | 44.3 | 3,925 ft | 58.0 | 4,813 ft |
| November | 33.3 | 3,189 ft | 45.0 | 3,971 ft |
| December | 26.0 | 2,690 ft | 37.4 | 3,466 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 KCII
DENSITY ALTITUDE caution
Field elevation 3,947 ft — the air behaves like 6,302 ft.
- PRESSURE ALT
- 3,949 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
- 5U5 — Fairfield
Fairfield · elev 3,991 ft
- 5U1 — Dutton
Dutton · elev 3,699 ft
- S01 — Conrad
Conrad · elev 3,548 ft
- 3U5 — Augusta
Augusta · elev 4,145 ft
- 7S7 — Valier
Valier · elev 3,826 ft
- 3U7 — Benchmark
Augusta · elev 5,434 ft
- KGTF — Great Falls International
Great Falls · elev 3,680 ft
- KSBX — Shelby
Shelby · elev 3,443 ft
Frequently asked questions
How high does density altitude get at KCII in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Choteau reaches roughly 6,302 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 KCII on an average day?
It swings with the seasons: from roughly 2,649 ft at the coldest month's average temperature to about 5,269 ft at the warmest month's — all from a constant field elevation of 3,947 ft. The month-by-month table above carries the full year.
What is the field elevation of Choteau?
3,947 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCII (ICAO) / CII (FAA), in Choteau, Montana.