Augusta, Montana · field elev 4,145 ft
Density Altitude at Augusta (3U5)
From a field elevation of 4,145 ft, a typical July afternoon at Augusta (82 °F) raises density altitude to about 6,567 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 | 28.0 | 3,074 ft | 39.0 | 3,818 ft |
| February | 27.7 | 3,054 ft | 39.5 | 3,851 ft |
| March | 35.3 | 3,570 ft | 47.0 | 4,346 ft |
| April | 43.2 | 4,097 ft | 55.1 | 4,871 ft |
| May | 51.8 | 4,659 ft | 64.5 | 5,467 ft ▲ |
| June | 59.3 | 5,139 ft | 71.9 | 5,927 ft ▲ |
| July | 66.9 | 5,617 ft | 82.4 | 6,567 ft ▲ |
| August | 65.7 | 5,542 ft | 82.0 | 6,543 ft ▲ |
| September | 57.4 | 5,018 ft | 72.7 | 5,977 ft ▲ |
| October | 46.2 | 4,294 ft | 58.8 | 5,107 ft ▲ |
| November | 35.3 | 3,570 ft | 45.0 | 4,215 ft |
| December | 28.2 | 3,088 ft | 38.4 | 3,778 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 3U5
DENSITY ALTITUDE caution
Field elevation 4,145 ft — the air behaves like 6,543 ft.
- PRESSURE ALT
- 4,147 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
- 5U5 — Fairfield
Fairfield · elev 3,991 ft
- 3U7 — Benchmark
Augusta · elev 5,434 ft
- KCII — Choteau
Choteau · elev 3,947 ft
- S69 — Lincoln
Lincoln · elev 4,603 ft
- 5U1 — Dutton
Dutton · elev 3,699 ft
- KGTF — Great Falls International
Great Falls · elev 3,680 ft
- S01 — Conrad
Conrad · elev 3,548 ft
- 23S — Seeley Lake
Seeley Lake · elev 4,256 ft
Frequently asked questions
How high does density altitude get at 3U5 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Augusta reaches roughly 6,567 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 3U5 on an average day?
It swings with the seasons: from roughly 3,054 ft at the coldest month's average temperature to about 5,617 ft at the warmest month's — all from a constant field elevation of 4,145 ft. The month-by-month table above carries the full year.
What is the field elevation of Augusta?
4,145 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3U5 (FAA), in Augusta, Montana.