Tiber Dam, Montana · field elev 3,023 ft
Density Altitude at Tiber Dam (B70)
From a field elevation of 3,023 ft, a typical July afternoon at Tiber Dam (85 °F) raises density altitude to about 5,379 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 | 19.8 | 1,103 ft | 31.3 | 1,904 ft |
| February | 24.1 | 1,405 ft | 36.6 | 2,266 ft |
| March | 34.2 | 2,102 ft | 48.3 | 3,047 ft |
| April | 44.7 | 2,809 ft | 59.3 | 3,762 ft |
| May | 54.3 | 3,439 ft | 68.7 | 4,358 ft |
| June | 62.1 | 3,941 ft | 76.2 | 4,824 ft |
| July | 69.0 | 4,377 ft | 85.3 | 5,379 ft ▲ |
| August | 67.7 | 4,295 ft | 84.5 | 5,331 ft ▲ |
| September | 58.3 | 3,698 ft | 74.1 | 4,694 ft |
| October | 45.8 | 2,882 ft | 59.8 | 3,794 ft |
| November | 32.7 | 2,000 ft | 44.1 | 2,769 ft |
| December | 22.6 | 1,300 ft | 33.6 | 2,061 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 B70
DENSITY ALTITUDE caution
Field elevation 3,023 ft — the air behaves like 5,361 ft.
- PRESSURE ALT
- 3,025 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
- KLTY — Liberty County
Chester · elev 3,185 ft
- KSBX — Shelby
Shelby · elev 3,443 ft
- 79S — Fort Benton
Fort Benton · elev 2,869 ft
- S01 — Conrad
Conrad · elev 3,548 ft
- 5U1 — Dutton
Dutton · elev 3,699 ft
- 3U8 — Big Sandy
Big Sandy · elev 2,699 ft
- 7S7 — Valier
Valier · elev 3,826 ft
- KGTF — Great Falls International
Great Falls · elev 3,680 ft
Frequently asked questions
How high does density altitude get at B70 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Tiber Dam reaches roughly 5,379 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 B70 on an average day?
It swings with the seasons: from roughly 1,103 ft at the coldest month's average temperature to about 4,377 ft at the warmest month's — all from a constant field elevation of 3,023 ft. The month-by-month table above carries the full year.
What is the field elevation of Tiber Dam?
3,023 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is B70 (FAA), in Tiber Dam, Montana.