Spotted Bear, Montana · field elev 3,672 ft
Density Altitude at Spotted Bear /Usfs/ (8U4)
From a field elevation of 3,672 ft, a typical July afternoon at Spotted Bear /Usfs/ (82 °F) raises density altitude to about 5,956 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 | 24.3 | 2,229 ft | 30.7 | 2,671 ft |
| February | 27.0 | 2,416 ft | 36.1 | 3,037 ft |
| March | 35.4 | 2,990 ft | 45.2 | 3,644 ft |
| April | 42.7 | 3,479 ft | 54.1 | 4,225 ft |
| May | 51.2 | 4,037 ft | 64.2 | 4,869 ft |
| June | 57.6 | 4,450 ft | 70.7 | 5,276 ft ▲ |
| July | 64.7 | 4,901 ft | 81.8 | 5,956 ft ▲ |
| August | 63.8 | 4,844 ft | 81.7 | 5,950 ft ▲ |
| September | 54.5 | 4,251 ft | 70.1 | 5,239 ft ▲ |
| October | 43.4 | 3,525 ft | 54.8 | 4,270 ft |
| November | 32.2 | 2,773 ft | 38.9 | 3,226 ft |
| December | 25.3 | 2,299 ft | 30.4 | 2,650 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 8U4
DENSITY ALTITUDE caution
Field elevation 3,672 ft — the air behaves like 5,968 ft.
- PRESSURE ALT
- 3,674 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
- 0S1 — Meadow Creek Usfs
Meadow Creek · elev 3,993 ft
- 8U2 — Schafer /Usfs/
Schafer · elev 4,856 ft
- 53U — Ferndale Airfield
Bigfork · elev 3,072 ft
- S04 — Condon Usfs
Condon · elev 3,686 ft
- 8S1 — Polson
Polson · elev 2,941 ft
- 7S0 — Ronan
Ronan · elev 3,086 ft
- S27 — Kalispell City
Kalispell · elev 2,932 ft
- KGPI — Glacier Park International
Kalispell · elev 2,977 ft
Frequently asked questions
How high does density altitude get at 8U4 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Spotted Bear /Usfs/ reaches roughly 5,956 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 8U4 on an average day?
It swings with the seasons: from roughly 2,229 ft at the coldest month's average temperature to about 4,901 ft at the warmest month's — all from a constant field elevation of 3,672 ft. The month-by-month table above carries the full year.
What is the field elevation of Spotted Bear /Usfs/?
3,672 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8U4 (FAA), in Spotted Bear, Montana.