Hailey, Idaho · field elev 4,844 ft
Density Altitude at Magic Reservoir (U93)
From a field elevation of 4,844 ft, a typical July afternoon at Magic Reservoir (87 °F) raises density altitude to about 7,677 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 | 19.4 | 3,351 ft | 31.8 | 4,201 ft |
| February | 23.3 | 3,621 ft | 36.4 | 4,510 ft |
| March | 32.9 | 4,275 ft | 46.5 | 5,176 ft ▲ |
| April | 41.2 | 4,828 ft | 57.1 | 5,857 ft ▲ |
| May | 50.6 | 5,441 ft | 67.1 | 6,484 ft ▲ |
| June | 57.6 | 5,888 ft | 76.1 | 7,035 ft ▲ |
| July | 66.5 | 6,446 ft | 86.8 | 7,677 ft ▲ |
| August | 65.2 | 6,366 ft | 85.5 | 7,600 ft ▲ |
| September | 56.5 | 5,819 ft | 75.6 | 7,005 ft ▲ |
| October | 44.0 | 5,012 ft | 60.6 | 6,078 ft ▲ |
| November | 31.3 | 4,168 ft | 44.5 | 5,045 ft ▲ |
| December | 20.8 | 3,448 ft | 32.3 | 4,235 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 U93
DENSITY ALTITUDE caution
Field elevation 4,844 ft — the air behaves like 7,689 ft.
- PRESSURE ALT
- 4,846 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
- KSUN — Friedman Meml
Hailey · elev 5,320 ft
- U86 — Fairfield/Frostenson Airfield
Fairfield · elev 5,058 ft
- U65 — Carey
Carey · elev 4,789 ft
- KGNG — Gooding Municipal
Gooding · elev 3,732 ft
- U99 — Laidlaw Corrals
Kimama · elev 4,448 ft
- KJER — Jerome County
Jerome · elev 4,053 ft
- 0U7 — Hollow Top
Carey · elev 5,359 ft
- 0U2 — Copper Basin
Mackay · elev 7,920 ft
Frequently asked questions
How high does density altitude get at U93 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Magic Reservoir reaches roughly 7,677 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 U93 on an average day?
It swings with the seasons: from roughly 3,351 ft at the coldest month's average temperature to about 6,446 ft at the warmest month's — all from a constant field elevation of 4,844 ft. The month-by-month table above carries the full year.
What is the field elevation of Magic Reservoir?
4,844 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U93 (FAA), in Hailey, Idaho.