Lincoln, Montana · field elev 4,603 ft
Density Altitude at Lincoln (S69)
From a field elevation of 4,603 ft, a typical July afternoon at Lincoln (81 °F) raises density altitude to about 7,057 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 | 22.0 | 3,231 ft | 31.7 | 3,895 ft |
| February | 25.1 | 3,445 ft | 34.7 | 4,098 ft |
| March | 32.8 | 3,970 ft | 43.9 | 4,708 ft |
| April | 39.7 | 4,431 ft | 52.6 | 5,274 ft ▲ |
| May | 47.9 | 4,970 ft | 62.5 | 5,902 ft ▲ |
| June | 55.6 | 5,466 ft | 71.1 | 6,437 ft ▲ |
| July | 62.6 | 5,909 ft | 81.3 | 7,057 ft ▲ |
| August | 61.4 | 5,833 ft | 81.1 | 7,045 ft ▲ |
| September | 52.8 | 5,286 ft | 70.2 | 6,381 ft ▲ |
| October | 41.5 | 4,550 ft | 54.4 | 5,389 ft ▲ |
| November | 29.5 | 3,746 ft | 38.9 | 4,378 ft |
| December | 21.6 | 3,203 ft | 30.5 | 3,814 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 S69
DENSITY ALTITUDE caution
Field elevation 4,603 ft — the air behaves like 7,039 ft.
- PRESSURE ALT
- 4,605 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
- M26 — Drummond
Drummond · elev 4,245 ft
- 3U5 — Augusta
Augusta · elev 4,145 ft
- 3U7 — Benchmark
Augusta · elev 5,434 ft
- 38S — Deer Lodge-City-County
Deer Lodge · elev 4,693 ft
- KHLN — Helena Regional
Helena · elev 3,877 ft
- 23S — Seeley Lake
Seeley Lake · elev 4,256 ft
- RC0 — Rock Creek
Clinton · elev 3,547 ft
- U05 — Riddick Field
Philipsburg · elev 5,219 ft
Frequently asked questions
How high does density altitude get at S69 in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Lincoln reaches roughly 7,057 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 S69 on an average day?
It swings with the seasons: from roughly 3,203 ft at the coldest month's average temperature to about 5,909 ft at the warmest month's — all from a constant field elevation of 4,603 ft. The month-by-month table above carries the full year.
What is the field elevation of Lincoln?
4,603 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is S69 (FAA), in Lincoln, Montana.