Atomic City, Idaho · field elev 5,017 ft
Density Altitude at Midway (U37)
Midway is a genuine high-and-hot field: from 5,017 ft of elevation, a typical July afternoon (89 °F) pushes density altitude to about 8,004 ft — the airplane performs like it is 2,987 ft above the field before the wheels roll.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 16.9 | 3,392 ft | 28.1 | 4,165 ft |
| February | 21.9 | 3,740 ft | 33.3 | 4,517 ft |
| March | 33.7 | 4,544 ft | 46.2 | 5,369 ft ▲ |
| April | 42.6 | 5,134 ft | 57.1 | 6,069 ft ▲ |
| May | 52.0 | 5,744 ft | 67.3 | 6,707 ft ▲ |
| June | 60.5 | 6,283 ft | 77.3 | 7,318 ft ▲ |
| July | 69.3 | 6,831 ft | 88.8 | 8,004 ft ⚠ |
| August | 67.2 | 6,701 ft | 86.7 | 7,880 ft ▲ |
| September | 57.0 | 6,063 ft | 75.7 | 7,222 ft ▲ |
| October | 43.5 | 5,193 ft | 59.6 | 6,227 ft ▲ |
| November | 29.4 | 4,254 ft | 42.3 | 5,114 ft ▲ |
| December | 18.2 | 3,483 ft | 29.3 | 4,247 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 U37
DENSITY ALTITUDE high DA
Field elevation 5,017 ft — the air behaves like 8,016 ft.
- PRESSURE ALT
- 5,019 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
- U46 — Big Southern Butte
Atomic City · elev 5,073 ft
- 2U4 — Rockford Municipal
Rockford · elev 4,465 ft
- U48 — Coxs Well
Atomic City · elev 5,048 ft
- KAOC — Arco-Butte County
Arco · elev 5,335 ft
- U02 — Mccarley Field
Blackfoot · elev 4,492 ft
- U97 — Howe
Howe · elev 4,930 ft
- 1U2 — Mud Lake/West Jefferson County
Mud Lake · elev 4,795 ft
- U36 — Aberdeen Municipal
Aberdeen · elev 4,474 ft
Frequently asked questions
How high does density altitude get at U37 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Midway reaches roughly 8,004 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 U37 on an average day?
It swings with the seasons: from roughly 3,392 ft at the coldest month's average temperature to about 6,831 ft at the warmest month's — all from a constant field elevation of 5,017 ft. The month-by-month table above carries the full year.
What is the field elevation of Midway?
5,017 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U37 (FAA), in Atomic City, Idaho.