Glenns Ferry, Idaho · field elev 2,536 ft
Density Altitude at Glenns Ferry Municipal (U89)
From a field elevation of 2,536 ft, a typical July afternoon at Glenns Ferry Municipal (99 °F) raises density altitude to about 5,611 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 | 34.3 | 1,504 ft | 43.7 | 2,139 ft |
| February | 38.4 | 1,783 ft | 50.2 | 2,571 ft |
| March | 46.2 | 2,306 ft | 60.3 | 3,227 ft |
| April | 52.7 | 2,735 ft | 67.9 | 3,711 ft |
| May | 62.0 | 3,336 ft | 78.5 | 4,372 ft |
| June | 70.3 | 3,862 ft | 87.9 | 4,944 ft |
| July | 78.8 | 4,390 ft | 99.1 | 5,611 ft ▲ |
| August | 76.4 | 4,242 ft | 97.2 | 5,499 ft ▲ |
| September | 66.2 | 3,604 ft | 86.3 | 4,848 ft |
| October | 53.7 | 2,800 ft | 71.3 | 3,925 ft |
| November | 42.0 | 2,026 ft | 55.1 | 2,891 ft |
| December | 34.2 | 1,497 ft | 43.9 | 2,153 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 U89
DENSITY ALTITUDE caution
Field elevation 2,536 ft — the air behaves like 5,605 ft.
- PRESSURE ALT
- 2,538 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- 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
- U76 — Mountain Home Municipal
Mountain Home · elev 3,167 ft
- KGNG — Gooding Municipal
Gooding · elev 3,732 ft
- U03 — Buhl Municipal
Buhl · elev 3,663 ft
- 1U9 — Pine
Pine · elev 4,232 ft
- U86 — Fairfield/Frostenson Airfield
Fairfield · elev 5,058 ft
- 2U0 — Smith Prairie
Prairie · elev 4,958 ft
- KJER — Jerome County
Jerome · elev 4,053 ft
- U91 — Grasmere
Grasmere · elev 5,144 ft
Frequently asked questions
How high does density altitude get at U89 in summer?
On a typical July afternoon — around 99 °F at the nearest NOAA normals station — density altitude at Glenns Ferry Municipal reaches roughly 5,611 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 U89 on an average day?
It swings with the seasons: from roughly 1,497 ft at the coldest month's average temperature to about 4,390 ft at the warmest month's — all from a constant field elevation of 2,536 ft. The month-by-month table above carries the full year.
What is the field elevation of Glenns Ferry Municipal?
2,536 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U89 (FAA), in Glenns Ferry, Idaho.