Preston, Idaho · field elev 4,728 ft
Density Altitude at Preston (U10)
From a field elevation of 4,728 ft, a typical July afternoon at Preston (89 °F) raises density altitude to about 7,678 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 | 23.8 | 3,511 ft | 32.3 | 4,091 ft |
| February | 28.0 | 3,799 ft | 37.7 | 4,453 ft |
| March | 38.8 | 4,526 ft | 50.3 | 5,279 ft ▲ |
| April | 46.0 | 5,000 ft | 59.1 | 5,841 ft ▲ |
| May | 54.8 | 5,568 ft | 69.1 | 6,466 ft ▲ |
| June | 63.1 | 6,093 ft | 79.4 | 7,094 ft ▲ |
| July | 71.4 | 6,607 ft | 89.2 | 7,678 ft ▲ |
| August | 69.9 | 6,515 ft | 87.4 | 7,572 ft ▲ |
| September | 59.9 | 5,892 ft | 76.9 | 6,943 ft ▲ |
| October | 48.0 | 5,130 ft | 62.6 | 6,061 ft ▲ |
| November | 35.3 | 4,293 ft | 46.5 | 5,033 ft ▲ |
| December | 25.0 | 3,594 ft | 33.5 | 4,172 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 U10
DENSITY ALTITUDE caution
Field elevation 4,728 ft — the air behaves like 7,666 ft.
- PRESSURE ALT
- 4,730 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- 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
- KMLD — Malad City
Malad City · elev 4,503 ft
- U58 — Downey/Hyde Meml/
Downey · elev 4,919 ft
- 0ID — W E Ranch
Thatcher · elev 5,075 ft
- 1U7 — Bear Lake County
Paris · elev 5,933 ft
- U78 — Allen H Tigert
Soda Springs · elev 5,843 ft
- U51 — Bancroft Municipal
Bancroft · elev 5,435 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 U10 in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Preston reaches roughly 7,678 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 U10 on an average day?
It swings with the seasons: from roughly 3,511 ft at the coldest month's average temperature to about 6,607 ft at the warmest month's — all from a constant field elevation of 4,728 ft. The month-by-month table above carries the full year.
What is the field elevation of Preston?
4,728 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U10 (FAA), in Preston, Idaho.