Dell, Montana · field elev 6,007 ft
Density Altitude at Dell Flight Strip (4U9)
Dell Flight Strip is a genuine high-and-hot field: from 6,007 ft of elevation, a typical July afternoon (83 °F) pushes density altitude to about 8,836 ft — the airplane performs like it is 2,829 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 20.6 | 4,884 ft | 30.2 | 5,536 ft ▲ |
| February | 22.8 | 5,035 ft | 33.7 | 5,770 ft ▲ |
| March | 32.2 | 5,670 ft | 43.7 | 6,426 ft ▲ |
| April | 39.9 | 6,179 ft | 52.7 | 7,004 ft ▲ |
| May | 48.7 | 6,749 ft | 62.2 | 7,600 ft ▲ |
| June | 56.7 | 7,256 ft | 71.6 | 8,177 ft ⚠ |
| July | 64.9 | 7,767 ft | 82.6 | 8,836 ft ⚠ |
| August | 63.5 | 7,680 ft | 81.3 | 8,759 ft ⚠ |
| September | 55.0 | 7,149 ft | 71.3 | 8,158 ft ⚠ |
| October | 42.8 | 6,368 ft | 56.4 | 7,238 ft ▲ |
| November | 30.1 | 5,529 ft | 40.9 | 6,244 ft ▲ |
| December | 20.5 | 4,877 ft | 29.7 | 5,502 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 4U9
DENSITY ALTITUDE high DA
Field elevation 6,007 ft — the air behaves like 8,859 ft.
- PRESSURE ALT
- 6,009 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
- KDLN — Dillon
Dillon · elev 5,245 ft
- KRVF — Ruby Valley Field
Twin Bridges · elev 4,789 ft
- KEKS — Ennis Big Sky
Ennis · elev 5,433 ft
- 7S4 — Wisdom
Wisdom · elev 6,133 ft
- 02T — Wise River
Wise River · elev 5,830 ft
- KWYS — Yellowstone
West Yellowstone · elev 6,649 ft
- KBTM — Bert Mooney
Butte · elev 5,551 ft
- 9S5 — Three Forks
Three Forks · elev 4,089 ft
Frequently asked questions
How high does density altitude get at 4U9 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Dell Flight Strip reaches roughly 8,836 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 4U9 on an average day?
It swings with the seasons: from roughly 4,877 ft at the coldest month's average temperature to about 7,767 ft at the warmest month's — all from a constant field elevation of 6,007 ft. The month-by-month table above carries the full year.
What is the field elevation of Dell Flight Strip?
6,007 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4U9 (FAA), in Dell, Montana.