Chamberlain Guard Station, Idaho · field elev 5,765 ft
Density Altitude at Chamberlain Usfs (U79)
Chamberlain Usfs is a genuine high-and-hot field: from 5,765 ft of elevation, a typical July afternoon (76 °F) pushes density altitude to about 8,142 ft — the airplane performs like it is 2,377 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 | 17.8 | 4,389 ft | 30.7 | 5,269 ft ▲ |
| February | 20.4 | 4,569 ft | 33.0 | 5,423 ft ▲ |
| March | 25.5 | 4,918 ft | 38.4 | 5,781 ft ▲ |
| April | 32.9 | 5,417 ft | 45.5 | 6,245 ft ▲ |
| May | 42.6 | 6,057 ft | 56.7 | 6,960 ft ▲ |
| June | 49.5 | 6,503 ft | 64.5 | 7,447 ft ▲ |
| July | 57.3 | 6,998 ft | 75.9 | 8,142 ft ⚠ |
| August | 56.0 | 6,916 ft | 75.6 | 8,124 ft ⚠ |
| September | 48.2 | 6,419 ft | 65.3 | 7,496 ft ▲ |
| October | 37.9 | 5,749 ft | 52.1 | 6,669 ft ▲ |
| November | 24.8 | 4,870 ft | 35.8 | 5,610 ft ▲ |
| December | 16.6 | 4,306 ft | 27.7 | 5,067 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 U79
DENSITY ALTITUDE high DA
Field elevation 5,765 ft — the air behaves like 8,148 ft.
- PRESSURE ALT
- 5,767 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
- U81 — Cold Meadows Usfs
Cold Meadows Guard Station · elev 7,030 ft
- C48 — Wilson Bar Usfs
Dixie · elev 2,275 ft
- U60 — Big Creek
Big Creek · elev 5,743 ft
- A05 — Dixie Usfs
Dixie · elev 5,148 ft
- I08 — Cabin Creek Usfs
Big Creek Ranger Station · elev 4,289 ft
- 3U1 — Warren /Usfs/
Warren · elev 5,902 ft
- 85U — Soldier Bar Usfs
Soldier Bar · elev 4,190 ft
- 75C — Orogrande
Orogrande · elev 4,419 ft
Frequently asked questions
How high does density altitude get at U79 in summer?
On a typical July afternoon — around 76 °F at the nearest NOAA normals station — density altitude at Chamberlain Usfs reaches roughly 8,142 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 U79 on an average day?
It swings with the seasons: from roughly 4,306 ft at the coldest month's average temperature to about 6,998 ft at the warmest month's — all from a constant field elevation of 5,765 ft. The month-by-month table above carries the full year.
What is the field elevation of Chamberlain Usfs?
5,765 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is U79 (FAA), in Chamberlain Guard Station, Idaho.