Challis, Idaho · field elev 5,076 ft
Density Altitude at Challis (KLLJ)
From a field elevation of 5,076 ft, a typical July afternoon at Challis (87 °F) raises density altitude to about 7,963 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 | 20.0 | 3,682 ft | 29.2 | 4,313 ft |
| February | 26.8 | 4,150 ft | 36.7 | 4,817 ft |
| March | 37.3 | 4,857 ft | 49.2 | 5,636 ft ▲ |
| April | 44.0 | 5,299 ft | 56.8 | 6,122 ft ▲ |
| May | 53.4 | 5,906 ft | 66.8 | 6,748 ft ▲ |
| June | 60.9 | 6,381 ft | 75.5 | 7,281 ft ▲ |
| July | 69.3 | 6,903 ft | 86.9 | 7,963 ft ▲ |
| August | 67.4 | 6,785 ft | 84.9 | 7,845 ft ▲ |
| September | 58.2 | 6,211 ft | 74.5 | 7,220 ft ▲ |
| October | 45.0 | 5,364 ft | 58.5 | 6,230 ft ▲ |
| November | 30.5 | 4,401 ft | 40.5 | 5,069 ft ▲ |
| December | 19.8 | 3,668 ft | 28.8 | 4,286 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 KLLJ
DENSITY ALTITUDE caution
Field elevation 5,076 ft — the air behaves like 7,969 ft.
- PRESSURE ALT
- 5,078 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
- 0U8 — May
May · elev 5,324 ft
- U72 — Upper Loon Creek Usfs
Challis · elev 5,500 ft
- C53 — Lower Loon Creek
Challis · elev 4,200 ft
- D47 — Cougar Ranch
Challis · elev 4,277 ft
- 0U3 — Mahoney Creek Usfs
Mahoney Creek · elev 4,618 ft
- U61 — Twin Bridges
Ketchum · elev 6,900 ft
- 4D2 — Hoodoo Meadows
Salmon · elev 8,262 ft
- U54 — Bernard Usfs
Bernard · elev 3,626 ft
Frequently asked questions
How high does density altitude get at KLLJ in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Challis reaches roughly 7,963 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 KLLJ on an average day?
It swings with the seasons: from roughly 3,668 ft at the coldest month's average temperature to about 6,903 ft at the warmest month's — all from a constant field elevation of 5,076 ft. The month-by-month table above carries the full year.
What is the field elevation of Challis?
5,076 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KLLJ (ICAO) / LLJ (FAA), in Challis, Idaho.