Dubois, Idaho · field elev 5,123 ft
Density Altitude at Dubois Municipal (U41)
Dubois Municipal is a genuine high-and-hot field: from 5,123 ft of elevation, a typical July afternoon (87 °F) pushes density altitude to about 8,009 ft — the airplane performs like it is 2,886 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 22.2 | 3,893 ft | 29.5 | 4,392 ft |
| February | 25.3 | 4,106 ft | 33.2 | 4,642 ft |
| March | 35.0 | 4,762 ft | 44.4 | 5,383 ft ▲ |
| April | 44.8 | 5,409 ft | 56.7 | 6,173 ft ▲ |
| May | 53.6 | 5,976 ft | 66.7 | 6,799 ft ▲ |
| June | 61.8 | 6,495 ft | 76.3 | 7,387 ft ▲ |
| July | 70.7 | 7,046 ft | 86.7 | 8,009 ft ⚠ |
| August | 69.3 | 6,960 ft | 85.4 | 7,932 ft ▲ |
| September | 59.7 | 6,363 ft | 74.6 | 7,284 ft ▲ |
| October | 46.2 | 5,500 ft | 58.1 | 6,262 ft ▲ |
| November | 32.4 | 4,588 ft | 41.0 | 5,160 ft ▲ |
| December | 22.6 | 3,921 ft | 29.7 | 4,406 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 U41
DENSITY ALTITUDE high DA
Field elevation 5,123 ft — the air behaves like 8,026 ft.
- PRESSURE ALT
- 5,125 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 Idaho fields
- 1U2 — Mud Lake/West Jefferson County
Mud Lake · elev 4,795 ft
- U12 — Stanford Field
St Anthony · elev 4,966 ft
- KRXE — Rexburg-Madison County
Rexburg · elev 4,862 ft
- U56 — Rigby
Rigby · elev 4,845 ft
- KIDA — Idaho Falls Regional
Idaho Falls · elev 4,744 ft
- U97 — Howe
Howe · elev 4,930 ft
- U53 — Henrys Lake
Island Park · elev 6,596 ft
- U37 — Midway
Atomic City · elev 5,017 ft
Frequently asked questions
How high does density altitude get at U41 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Dubois Municipal reaches roughly 8,009 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 U41 on an average day?
It swings with the seasons: from roughly 3,893 ft at the coldest month's average temperature to about 7,046 ft at the warmest month's — all from a constant field elevation of 5,123 ft. The month-by-month table above carries the full year.
What is the field elevation of Dubois Municipal?
5,123 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U41 (FAA), in Dubois, Idaho.