Culver, Oregon · field elev 2,695 ft
Density Altitude at Lake Billy Chinook (5S5)
From a field elevation of 2,695 ft, a typical July afternoon at Lake Billy Chinook (87 °F) raises density altitude to about 5,089 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 | 33.7 | 1,660 ft | 43.0 | 2,290 ft |
| February | 35.5 | 1,783 ft | 45.9 | 2,483 ft |
| March | 41.2 | 2,169 ft | 54.0 | 3,016 ft |
| April | 45.9 | 2,483 ft | 60.6 | 3,442 ft |
| May | 54.0 | 3,016 ft | 69.4 | 4,000 ft |
| June | 60.6 | 3,442 ft | 76.9 | 4,467 ft |
| July | 68.3 | 3,931 ft | 87.1 | 5,089 ft ▲ |
| August | 68.0 | 3,912 ft | 86.4 | 5,047 ft ▲ |
| September | 60.4 | 3,429 ft | 77.6 | 4,510 ft |
| October | 49.0 | 2,688 ft | 63.0 | 3,595 ft |
| November | 38.8 | 2,007 ft | 49.3 | 2,708 ft |
| December | 32.3 | 1,564 ft | 41.3 | 2,176 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 5S5
DENSITY ALTITUDE caution
Field elevation 2,695 ft — the air behaves like 5,083 ft.
- PRESSURE ALT
- 2,697 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 Oregon fields
- S33 — Madras Municipal
Madras · elev 2,438 ft
- 6K5 — Sisters Eagle Air
Sisters · elev 3,168 ft
- KRDM — Roberts Field/Redmond Municipal
Redmond · elev 3,082 ft
- S39 — Prineville
Prineville · elev 3,251 ft
- KBDN — Bend Municipal
Bend · elev 3,459 ft
- 8S3 — Santiam Junction State
Santiam Junction · elev 3,780 ft
- 00S — Mc Kenzie Bridge State
Mc Kenzie Bridge · elev 1,620 ft
- S21 — Sunriver
Sunriver · elev 4,164 ft
Frequently asked questions
How high does density altitude get at 5S5 in summer?
On a typical July afternoon — around 87 °F at the nearest NOAA normals station — density altitude at Lake Billy Chinook reaches roughly 5,089 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 5S5 on an average day?
It swings with the seasons: from roughly 1,564 ft at the coldest month's average temperature to about 3,931 ft at the warmest month's — all from a constant field elevation of 2,695 ft. The month-by-month table above carries the full year.
What is the field elevation of Lake Billy Chinook?
2,695 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 5S5 (FAA), in Culver, Oregon.