Winifred, Montana · field elev 2,304 ft
Density Altitude at Heller Farm (L51)
Heller Farm sits at 2,304 ft, and even a typical July afternoon (86 °F) only lifts density altitude to about 4,554 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 21.1 | 294 ft | 32.7 | 1,105 ft |
| February | 23.7 | 478 ft | 35.6 | 1,304 ft |
| March | 33.2 | 1,139 ft | 45.0 | 1,939 ft |
| April | 44.0 | 1,872 ft | 56.2 | 2,677 ft |
| May | 53.7 | 2,514 ft | 66.3 | 3,326 ft |
| June | 62.4 | 3,077 ft | 74.6 | 3,847 ft |
| July | 70.9 | 3,616 ft | 86.1 | 4,554 ft |
| August | 69.0 | 3,496 ft | 84.2 | 4,438 ft |
| September | 59.1 | 2,865 ft | 73.6 | 3,785 ft |
| October | 45.8 | 1,992 ft | 58.8 | 2,845 ft |
| November | 32.7 | 1,105 ft | 44.5 | 1,906 ft |
| December | 22.2 | 372 ft | 33.3 | 1,146 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 L51
DENSITY ALTITUDE
Field elevation 2,304 ft — the air behaves like 4,548 ft.
- PRESSURE ALT
- 2,305 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
- MT3 — Knox Ridge
Winifred · elev 2,950 ft
- WH0 — Woodhawk
Winifred · elev 3,100 ft
- LC0 — Left Coulee
Winifred · elev 3,150 ft
- BW8 — Bullwhacker
Winifred · elev 3,100 ft
- CW0 — Cow Creek
Winifred · elev 3,300 ft
- BB0 — Black Butte North
Winifred · elev 3,150 ft
- 9S7 — Winifred
Winifred · elev 3,354 ft
- KLWT — Lewistown Municipal
Lewistown · elev 4,170 ft
Frequently asked questions
How high does density altitude get at L51 in summer?
On a typical July afternoon — around 86 °F at the nearest NOAA normals station — density altitude at Heller Farm reaches roughly 4,554 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 L51 on an average day?
It swings with the seasons: from roughly 294 ft at the coldest month's average temperature to about 3,616 ft at the warmest month's — all from a constant field elevation of 2,304 ft. The month-by-month table above carries the full year.
What is the field elevation of Heller Farm?
2,304 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is L51 (FAA), in Winifred, Montana.