St Anthony, Idaho · field elev 4,966 ft
Density Altitude at Stanford Field (U12)
From a field elevation of 4,966 ft, a typical July afternoon at Stanford Field (83 °F) raises density altitude to about 7,623 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 | 19.7 | 3,524 ft | 27.6 | 4,068 ft |
| February | 23.2 | 3,766 ft | 32.2 | 4,380 ft |
| March | 33.3 | 4,454 ft | 43.5 | 5,130 ft ▲ |
| April | 43.0 | 5,097 ft | 55.4 | 5,898 ft ▲ |
| May | 52.0 | 5,681 ft | 65.0 | 6,502 ft ▲ |
| June | 59.3 | 6,145 ft | 73.4 | 7,020 ft ▲ |
| July | 66.9 | 6,620 ft | 83.4 | 7,623 ft ▲ |
| August | 65.7 | 6,546 ft | 82.8 | 7,587 ft ▲ |
| September | 56.8 | 5,987 ft | 72.5 | 6,965 ft ▲ |
| October | 44.6 | 5,202 ft | 57.7 | 6,044 ft ▲ |
| November | 31.5 | 4,332 ft | 41.3 | 4,986 ft |
| December | 21.1 | 3,621 ft | 28.9 | 4,156 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 U12
DENSITY ALTITUDE caution
Field elevation 4,966 ft — the air behaves like 7,599 ft.
- PRESSURE ALT
- 4,968 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
- KRXE — Rexburg-Madison County
Rexburg · elev 4,862 ft
- U56 — Rigby
Rigby · elev 4,845 ft
- U41 — Dubois Municipal
Dubois · elev 5,123 ft
- KDIJ — Driggs/Reed Meml
Driggs · elev 6,257 ft
- KIDA — Idaho Falls Regional
Idaho Falls · elev 4,744 ft
- 1U2 — Mud Lake/West Jefferson County
Mud Lake · elev 4,795 ft
- U53 — Henrys Lake
Island Park · elev 6,596 ft
- U02 — Mccarley Field
Blackfoot · elev 4,492 ft
Frequently asked questions
How high does density altitude get at U12 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Stanford Field reaches roughly 7,623 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 U12 on an average day?
It swings with the seasons: from roughly 3,524 ft at the coldest month's average temperature to about 6,620 ft at the warmest month's — all from a constant field elevation of 4,966 ft. The month-by-month table above carries the full year.
What is the field elevation of Stanford Field?
4,966 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U12 (FAA), in St Anthony, Idaho.