Boise, Idaho · field elev 2,872 ft
Density Altitude at Boise Air Trml/Gowen Field (KBOI)
From a field elevation of 2,872 ft, a typical July afternoon at Boise Air Trml/Gowen Field (93 °F) raises density altitude to about 5,639 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 | 32.2 | 1,778 ft | 38.8 | 2,227 ft |
| February | 37.5 | 2,139 ft | 46.0 | 2,708 ft |
| March | 45.2 | 2,655 ft | 55.5 | 3,331 ft |
| April | 50.9 | 3,031 ft | 62.3 | 3,768 ft |
| May | 59.9 | 3,615 ft | 72.3 | 4,398 ft |
| June | 67.8 | 4,116 ft | 81.4 | 4,959 ft |
| July | 77.3 | 4,708 ft | 92.7 | 5,639 ft ▲ |
| August | 75.8 | 4,615 ft | 90.7 | 5,520 ft ▲ |
| September | 66.3 | 4,022 ft | 80.0 | 4,873 ft |
| October | 53.2 | 3,182 ft | 64.8 | 3,927 ft |
| November | 40.3 | 2,328 ft | 48.8 | 2,893 ft |
| December | 32.1 | 1,771 ft | 38.8 | 2,227 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 KBOI
DENSITY ALTITUDE caution
Field elevation 2,872 ft — the air behaves like 5,657 ft.
- PRESSURE ALT
- 2,874 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
- KMAN — Nampa Municipal
Nampa · elev 2,537 ft
- KEUL — Caldwell Exec
Caldwell · elev 2,431 ft
- S78 — Emmett Municipal
Emmett · elev 2,354 ft
- U98 — Idaho City Usfs
Idaho City · elev 3,920 ft
- 1U3 — Murphy
Murphy · elev 2,855 ft
- 2U0 — Smith Prairie
Prairie · elev 4,958 ft
- S66 — Homedale Municipal
Homedale · elev 2,220 ft
- U88 — Garden Valley
Garden Valley · elev 3,177 ft
Frequently asked questions
How high does density altitude get at KBOI in summer?
On a typical July afternoon — around 93 °F at the nearest NOAA normals station — density altitude at Boise Air Trml/Gowen Field reaches roughly 5,639 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 KBOI on an average day?
It swings with the seasons: from roughly 1,771 ft at the coldest month's average temperature to about 4,708 ft at the warmest month's — all from a constant field elevation of 2,872 ft. The month-by-month table above carries the full year.
What is the field elevation of Boise Air Trml/Gowen Field?
2,872 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KBOI (ICAO) / BOI (FAA), in Boise, Idaho.