Atlanta, Idaho · field elev 5,726 ft
Density Altitude at Graham Usfs (U45)
Graham Usfs is a genuine high-and-hot field: from 5,726 ft of elevation, a typical July afternoon (80 °F) pushes density altitude to about 8,353 ft — the airplane performs like it is 2,627 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 | 11.3 | 3,885 ft | 25.7 | 4,883 ft |
| February | 15.9 | 4,208 ft | 32.7 | 5,355 ft ▲ |
| March | 25.6 | 4,876 ft | 42.6 | 6,009 ft ▲ |
| April | 34.0 | 5,442 ft | 49.7 | 6,468 ft ▲ |
| May | 43.2 | 6,048 ft | 60.4 | 7,144 ft ▲ |
| June | 50.0 | 6,487 ft | 68.8 | 7,664 ft ▲ |
| July | 57.1 | 6,938 ft | 80.2 | 8,353 ft ⚠ |
| August | 55.5 | 6,837 ft | 79.4 | 8,305 ft ⚠ |
| September | 47.7 | 6,339 ft | 70.3 | 7,756 ft ▲ |
| October | 37.4 | 5,667 ft | 56.1 | 6,874 ft ▲ |
| November | 24.0 | 4,767 ft | 38.4 | 5,733 ft ▲ |
| December | 11.4 | 3,892 ft | 25.0 | 4,836 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 U45
DENSITY ALTITUDE high DA
Field elevation 5,726 ft — the air behaves like 8,341 ft.
- PRESSURE ALT
- 5,728 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
- 52U — Weatherby Usfs
Atlanta · elev 4,503 ft
- 55H — Atlanta
Atlanta · elev 5,500 ft
- 0U1 — Warm Springs Creek
Lowman · elev 4,831 ft
- U87 — Smiley Creek
Smiley Creek · elev 7,206 ft
- 2U7 — Stanley
Stanley · elev 6,403 ft
- U98 — Idaho City Usfs
Idaho City · elev 3,920 ft
- U63 — Bruce Meadows
Stanley · elev 6,370 ft
- U88 — Garden Valley
Garden Valley · elev 3,177 ft
Frequently asked questions
How high does density altitude get at U45 in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Graham Usfs reaches roughly 8,353 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 U45 on an average day?
It swings with the seasons: from roughly 3,885 ft at the coldest month's average temperature to about 6,938 ft at the warmest month's — all from a constant field elevation of 5,726 ft. The month-by-month table above carries the full year.
What is the field elevation of Graham Usfs?
5,726 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U45 (FAA), in Atlanta, Idaho.