Santiam Junction, Oregon · field elev 3,780 ft
Density Altitude at Santiam Junction State (8S3)
From a field elevation of 3,780 ft, a typical August afternoon at Santiam Junction State (77 °F) raises density altitude to about 5,765 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 | 30.6 | 2,798 ft | 37.6 | 3,272 ft |
| February | 32.1 | 2,900 ft | 40.7 | 3,480 ft |
| March | 34.7 | 3,077 ft | 43.6 | 3,672 ft |
| April | 38.8 | 3,353 ft | 48.5 | 3,994 ft |
| May | 46.2 | 3,844 ft | 57.7 | 4,589 ft |
| June | 51.5 | 4,190 ft | 64.6 | 5,027 ft ▲ |
| July | 59.2 | 4,685 ft | 76.0 | 5,734 ft ▲ |
| August | 59.1 | 4,679 ft | 76.5 | 5,765 ft ▲ |
| September | 53.8 | 4,339 ft | 68.8 | 5,290 ft ▲ |
| October | 44.3 | 3,718 ft | 56.1 | 4,487 ft |
| November | 35.0 | 3,097 ft | 42.4 | 3,593 ft |
| December | 29.8 | 2,743 ft | 36.3 | 3,185 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 8S3
DENSITY ALTITUDE caution
Field elevation 3,780 ft — the air behaves like 5,796 ft.
- PRESSURE ALT
- 3,782 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
- 00S — Mc Kenzie Bridge State
Mc Kenzie Bridge · elev 1,620 ft
- 6K5 — Sisters Eagle Air
Sisters · elev 3,168 ft
- 5S5 — Lake Billy Chinook
Culver · elev 2,695 ft
- 6S4 — Davis
Gates · elev 1,028 ft
- KRDM — Roberts Field/Redmond Municipal
Redmond · elev 3,082 ft
- S33 — Madras Municipal
Madras · elev 2,438 ft
- KBDN — Bend Municipal
Bend · elev 3,459 ft
- S21 — Sunriver
Sunriver · elev 4,164 ft
Frequently asked questions
How high does density altitude get at 8S3 in summer?
On a typical August afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Santiam Junction State reaches roughly 5,765 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 8S3 on an average day?
It swings with the seasons: from roughly 2,743 ft at the coldest month's average temperature to about 4,685 ft at the warmest month's — all from a constant field elevation of 3,780 ft. The month-by-month table above carries the full year.
What is the field elevation of Santiam Junction State?
3,780 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8S3 (FAA), in Santiam Junction, Oregon.