Grants Pass, Oregon · field elev 1,130 ft
Density Altitude at Grants Pass (3S8)
Grants Pass sits at 1,130 ft, and even a typical August afternoon (91 °F) only lifts density altitude to about 3,399 ft — heat still trims performance, but the field rarely turns high-and-hot.
Typical density altitude by month
| Month | Avg temp °F | DA at avg temp | Afternoon high °F | DA on a typical afternoon |
|---|---|---|---|---|
| January | 41.5 | 247 ft | 47.6 | 659 ft |
| February | 44.8 | 470 ft | 53.9 | 1,078 ft |
| March | 48.2 | 699 ft | 59.6 | 1,452 ft |
| April | 52.6 | 992 ft | 65.4 | 1,827 ft |
| May | 59.9 | 1,471 ft | 74.1 | 2,380 ft |
| June | 65.9 | 1,859 ft | 81.2 | 2,823 ft |
| July | 73.4 | 2,336 ft | 90.5 | 3,393 ft |
| August | 72.7 | 2,292 ft | 90.6 | 3,399 ft |
| September | 66.1 | 1,872 ft | 83.9 | 2,990 ft |
| October | 55.5 | 1,183 ft | 69.8 | 2,108 ft |
| November | 46.1 | 558 ft | 53.8 | 1,071 ft |
| December | 40.4 | 172 ft | 45.7 | 531 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 3S8
DENSITY ALTITUDE
Field elevation 1,130 ft — the air behaves like 3,424 ft.
- PRESSURE ALT
- 1,131 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
- KMFR — Rogue Valley International/Medford
Medford · elev 1,335 ft
- 3S4 — Illinois Valley
Cave Junction · elev 1,394 ft
- 16S — Myrtle Creek Municipal
Myrtle Creek · elev 619 ft
- 6S6 — Powers
Powers · elev 326 ft
- S03 — Ashland Municipal/Sumner Parker Field
Ashland · elev 1,889 ft
- 64S — Prospect State
Prospect · elev 2,578 ft
- 5S1 — George Felt
Roseburg · elev 428 ft
- KRBG — Roseburg Regional
Roseburg · elev 533 ft
Frequently asked questions
How high does density altitude get at 3S8 in summer?
On a typical August afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Grants Pass reaches roughly 3,399 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 3S8 on an average day?
It swings with the seasons: from roughly 172 ft at the coldest month's average temperature to about 2,336 ft at the warmest month's — all from a constant field elevation of 1,130 ft. The month-by-month table above carries the full year.
What is the field elevation of Grants Pass?
1,130 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3S8 (FAA), in Grants Pass, Oregon.