Midvale, Idaho · field elev 2,617 ft
Density Altitude at Lee Williams Meml (0U9)
From a field elevation of 2,617 ft, a typical July afternoon at Lee Williams Meml (93 °F) raises density altitude to about 5,318 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 | 23.4 | 849 ft | 29.7 | 1,288 ft |
| February | 28.8 | 1,226 ft | 37.0 | 1,788 ft |
| March | 39.9 | 1,985 ft | 50.8 | 2,710 ft |
| April | 48.4 | 2,552 ft | 61.6 | 3,410 ft |
| May | 57.0 | 3,114 ft | 71.7 | 4,049 ft |
| June | 64.7 | 3,608 ft | 80.3 | 4,581 ft |
| July | 74.3 | 4,211 ft | 92.5 | 5,318 ft ▲ |
| August | 72.6 | 4,105 ft | 91.6 | 5,265 ft ▲ |
| September | 62.2 | 3,449 ft | 80.3 | 4,581 ft |
| October | 48.5 | 2,559 ft | 62.6 | 3,474 ft |
| November | 35.0 | 1,652 ft | 43.9 | 2,253 ft |
| December | 25.3 | 982 ft | 31.6 | 1,419 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 0U9
DENSITY ALTITUDE caution
Field elevation 2,617 ft — the air behaves like 5,348 ft.
- PRESSURE ALT
- 2,619 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
- S87 — Weiser Municipal
Weiser · elev 2,120 ft
- U82 — Council Municipal
Council · elev 2,966 ft
- S75 — Payette Municipal
Payette · elev 2,230 ft
- U70 — Cascade
Cascade · elev 4,748 ft
- U84 — Donald D Coski Meml
Donnelly · elev 4,860 ft
- 1U4 — New Meadows
New Meadows · elev 3,908 ft
- S78 — Emmett Municipal
Emmett · elev 2,354 ft
- KMYL — Mc Call Municipal
Mc Call · elev 5,024 ft
Frequently asked questions
How high does density altitude get at 0U9 in summer?
On a typical July afternoon — around 93 °F at the nearest NOAA normals station — density altitude at Lee Williams Meml reaches roughly 5,318 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 0U9 on an average day?
It swings with the seasons: from roughly 849 ft at the coldest month's average temperature to about 4,211 ft at the warmest month's — all from a constant field elevation of 2,617 ft. The month-by-month table above carries the full year.
What is the field elevation of Lee Williams Meml?
2,617 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 0U9 (FAA), in Midvale, Idaho.