Wilsall, Montana · field elev 5,140 ft
Density Altitude at Wilsall (9U1)
From a field elevation of 5,140 ft, a typical July afternoon at Wilsall (84 °F) raises density altitude to about 7,845 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 | 20.8 | 3,818 ft | 30.9 | 4,508 ft |
| February | 24.7 | 4,086 ft | 35.9 | 4,843 ft |
| March | 32.0 | 4,582 ft | 42.9 | 5,306 ft ▲ |
| April | 39.2 | 5,062 ft | 52.4 | 5,921 ft ▲ |
| May | 49.0 | 5,702 ft | 61.4 | 6,490 ft ▲ |
| June | 56.3 | 6,169 ft | 71.1 | 7,091 ft ▲ |
| July | 66.1 | 6,783 ft | 83.6 | 7,845 ft ▲ |
| August | 64.9 | 6,709 ft | 82.4 | 7,774 ft ▲ |
| September | 52.7 | 5,940 ft | 70.0 | 7,024 ft ▲ |
| October | 42.4 | 5,273 ft | 55.9 | 6,144 ft ▲ |
| November | 28.8 | 4,366 ft | 42.1 | 5,253 ft ▲ |
| December | 21.7 | 3,880 ft | 33.6 | 4,689 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 9U1
DENSITY ALTITUDE caution
Field elevation 5,140 ft — the air behaves like 7,869 ft.
- PRESSURE ALT
- 5,142 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
- KLVM — Mission Field
Livingston · elev 4,659 ft
- KBZN — Bozeman Yellowstone International
Bozeman · elev 4,473 ft
- 7S6 — White Sulphur Springs
White Sulphur Springs · elev 5,065 ft
- 6S0 — Big Timber At Howard Field
Big Timber · elev 4,494 ft
- 8U8 — Townsend
Townsend · elev 3,897 ft
- 9S5 — Three Forks
Three Forks · elev 4,089 ft
- M42 — Russian Flat
Russian Flat · elev 6,336 ft
- KHWQ — Wheatland County At Harlowton
Harlowton · elev 4,312 ft
Frequently asked questions
How high does density altitude get at 9U1 in summer?
On a typical July afternoon — around 84 °F at the nearest NOAA normals station — density altitude at Wilsall reaches roughly 7,845 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 9U1 on an average day?
It swings with the seasons: from roughly 3,818 ft at the coldest month's average temperature to about 6,783 ft at the warmest month's — all from a constant field elevation of 5,140 ft. The month-by-month table above carries the full year.
What is the field elevation of Wilsall?
5,140 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 9U1 (FAA), in Wilsall, Montana.