Winifred, Montana · field elev 3,150 ft
Density Altitude at Black Butte North (BB0)
From a field elevation of 3,150 ft, a typical July afternoon at Black Butte North (83 °F) raises density altitude to about 5,413 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 | 21.3 | 1,367 ft | 32.7 | 2,158 ft |
| February | 24.4 | 1,585 ft | 35.5 | 2,349 ft |
| March | 33.5 | 2,213 ft | 45.2 | 2,999 ft |
| April | 42.7 | 2,833 ft | 54.9 | 3,634 ft |
| May | 52.0 | 3,446 ft | 64.3 | 4,236 ft |
| June | 60.6 | 4,001 ft | 73.1 | 4,787 ft |
| July | 68.6 | 4,507 ft | 83.3 | 5,413 ft ▲ |
| August | 67.5 | 4,438 ft | 83.1 | 5,400 ft ▲ |
| September | 57.2 | 3,783 ft | 71.9 | 4,713 ft |
| October | 44.0 | 2,920 ft | 57.2 | 3,783 ft |
| November | 32.7 | 2,158 ft | 44.3 | 2,939 ft |
| December | 23.6 | 1,529 ft | 34.9 | 2,308 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 BB0
DENSITY ALTITUDE caution
Field elevation 3,150 ft — the air behaves like 5,394 ft.
- PRESSURE ALT
- 3,152 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
- BW8 — Bullwhacker
Winifred · elev 3,100 ft
- WH0 — Woodhawk
Winifred · elev 3,100 ft
- LC0 — Left Coulee
Winifred · elev 3,150 ft
- CW0 — Cow Creek
Winifred · elev 3,300 ft
- L51 — Heller Farm
Winifred · elev 2,304 ft
- 9S7 — Winifred
Winifred · elev 3,354 ft
- MT3 — Knox Ridge
Winifred · elev 2,950 ft
- 3U8 — Big Sandy
Big Sandy · elev 2,699 ft
Frequently asked questions
How high does density altitude get at BB0 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Black Butte North reaches roughly 5,413 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 BB0 on an average day?
It swings with the seasons: from roughly 1,367 ft at the coldest month's average temperature to about 4,507 ft at the warmest month's — all from a constant field elevation of 3,150 ft. The month-by-month table above carries the full year.
What is the field elevation of Black Butte North?
3,150 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is BB0 (FAA), in Winifred, Montana.