Downey, Idaho · field elev 4,919 ft
Density Altitude at Downey/Hyde Meml/ (U58)
From a field elevation of 4,919 ft, a typical July afternoon at Downey/Hyde Meml/ (89 °F) raises density altitude to about 7,874 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 | 23.3 | 3,715 ft | 32.1 | 4,315 ft |
| February | 27.2 | 3,982 ft | 36.6 | 4,616 ft |
| March | 36.3 | 4,596 ft | 47.7 | 5,346 ft ▲ |
| April | 44.4 | 5,131 ft | 57.8 | 5,993 ft ▲ |
| May | 52.6 | 5,662 ft | 67.1 | 6,575 ft ▲ |
| June | 60.9 | 6,189 ft | 77.9 | 7,236 ft ▲ |
| July | 69.8 | 6,742 ft | 88.6 | 7,874 ft ▲ |
| August | 68.4 | 6,656 ft | 87.7 | 7,821 ft ▲ |
| September | 58.9 | 6,063 ft | 76.9 | 7,175 ft ▲ |
| October | 46.5 | 5,268 ft | 61.7 | 6,239 ft ▲ |
| November | 34.4 | 4,469 ft | 45.9 | 5,229 ft ▲ |
| December | 24.9 | 3,825 ft | 33.6 | 4,416 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 U58
DENSITY ALTITUDE caution
Field elevation 4,919 ft — the air behaves like 7,897 ft.
- PRESSURE ALT
- 4,921 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
- 0ID — W E Ranch
Thatcher · elev 5,075 ft
- KMLD — Malad City
Malad City · elev 4,503 ft
- U51 — Bancroft Municipal
Bancroft · elev 5,435 ft
- U10 — Preston
Preston · elev 4,728 ft
- U78 — Allen H Tigert
Soda Springs · elev 5,843 ft
- 1U7 — Bear Lake County
Paris · elev 5,933 ft
- KPIH — Pocatello Regional
Pocatello · elev 4,452 ft
- U01 — Savage Field
American Falls · elev 4,420 ft
Frequently asked questions
How high does density altitude get at U58 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Downey/Hyde Meml/ reaches roughly 7,874 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 U58 on an average day?
It swings with the seasons: from roughly 3,715 ft at the coldest month's average temperature to about 6,742 ft at the warmest month's — all from a constant field elevation of 4,919 ft. The month-by-month table above carries the full year.
What is the field elevation of Downey/Hyde Meml/?
4,919 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U58 (FAA), in Downey, Idaho.