Lewistown, Montana · field elev 4,170 ft
Density Altitude at Lewistown Municipal (KLWT)
From a field elevation of 4,170 ft, a typical July afternoon at Lewistown Municipal (82 °F) raises density altitude to about 6,549 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 | 23.7 | 2,809 ft | 34.4 | 3,540 ft |
| February | 24.6 | 2,871 ft | 35.3 | 3,601 ft |
| March | 32.9 | 3,439 ft | 44.3 | 4,200 ft |
| April | 40.9 | 3,975 ft | 53.0 | 4,767 ft |
| May | 50.0 | 4,573 ft | 62.6 | 5,378 ft ▲ |
| June | 58.0 | 5,087 ft | 71.0 | 5,902 ft ▲ |
| July | 66.1 | 5,598 ft | 81.6 | 6,549 ft ▲ |
| August | 65.4 | 5,554 ft | 81.1 | 6,519 ft ▲ |
| September | 55.9 | 4,953 ft | 70.4 | 5,865 ft ▲ |
| October | 43.4 | 4,141 ft | 56.0 | 4,959 ft |
| November | 32.1 | 3,385 ft | 43.4 | 4,141 ft |
| December | 24.3 | 2,850 ft | 35.0 | 3,581 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 KLWT
DENSITY ALTITUDE caution
Field elevation 4,170 ft — the air behaves like 6,573 ft.
- PRESSURE ALT
- 4,172 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
- 5U0 — Denton
Denton · elev 3,594 ft
- 9S7 — Winifred
Winifred · elev 3,354 ft
- S64 — Stanford/Biggerstaff Field
Stanford · elev 4,328 ft
- KHWQ — Wheatland County At Harlowton
Harlowton · elev 4,312 ft
- MT3 — Knox Ridge
Winifred · elev 2,950 ft
- M42 — Russian Flat
Russian Flat · elev 6,336 ft
- 7S2 — Winnett
Winnett · elev 2,989 ft
- 5U8 — Geraldine
Geraldine · elev 3,185 ft
Frequently asked questions
How high does density altitude get at KLWT in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Lewistown Municipal reaches roughly 6,549 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 KLWT on an average day?
It swings with the seasons: from roughly 2,809 ft at the coldest month's average temperature to about 5,598 ft at the warmest month's — all from a constant field elevation of 4,170 ft. The month-by-month table above carries the full year.
What is the field elevation of Lewistown Municipal?
4,170 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KLWT (ICAO) / LWT (FAA), in Lewistown, Montana.