Miles City, Montana · field elev 2,634 ft
Density Altitude at Frank Wiley Field (KMLS)
From a field elevation of 2,634 ft, a typical July afternoon at Frank Wiley Field (89 °F) raises density altitude to about 5,112 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 | 19.5 | 594 ft | 30.1 | 1,337 ft |
| February | 23.6 | 884 ft | 34.7 | 1,653 ft |
| March | 34.7 | 1,653 ft | 46.8 | 2,467 ft |
| April | 45.5 | 2,381 ft | 58.1 | 3,206 ft |
| May | 55.5 | 3,038 ft | 68.1 | 3,844 ft |
| June | 65.6 | 3,686 ft | 78.6 | 4,498 ft |
| July | 74.2 | 4,226 ft | 88.7 | 5,112 ft ▲ |
| August | 72.5 | 4,120 ft | 87.4 | 5,033 ft ▲ |
| September | 61.2 | 3,406 ft | 75.6 | 4,312 ft |
| October | 46.4 | 2,441 ft | 59.0 | 3,264 ft |
| November | 32.7 | 1,516 ft | 44.3 | 2,301 ft |
| December | 22.4 | 799 ft | 33.1 | 1,543 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 KMLS
DENSITY ALTITUDE caution
Field elevation 2,634 ft — the air behaves like 5,130 ft.
- PRESSURE ALT
- 2,636 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
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Hysham · elev 2,624 ft
- 00F — Broadus
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- KGDV — Dawson Community
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Frequently asked questions
How high does density altitude get at KMLS in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Frank Wiley Field reaches roughly 5,112 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 KMLS on an average day?
It swings with the seasons: from roughly 594 ft at the coldest month's average temperature to about 4,226 ft at the warmest month's — all from a constant field elevation of 2,634 ft. The month-by-month table above carries the full year.
What is the field elevation of Frank Wiley Field?
2,634 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KMLS (ICAO) / MLS (FAA), in Miles City, Montana.