Portland, Oregon · field elev 208 ft
Density Altitude at Portland-Hillsboro (KHIO)
Portland-Hillsboro sits at 208 ft, and even a typical August afternoon (82 °F) only lifts density altitude to about 1,772 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 | 40.4 | −976 ft | 47.3 | −505 ft |
| February | 42.3 | −845 ft | 51.0 | −256 ft |
| March | 46.2 | −579 ft | 55.9 | 70 ft |
| April | 50.1 | −316 ft | 60.9 | 400 ft |
| May | 56.7 | 123 ft | 68.7 | 905 ft |
| June | 61.0 | 406 ft | 73.5 | 1,212 ft |
| July | 67.2 | 809 ft | 82.1 | 1,753 ft |
| August | 67.1 | 802 ft | 82.4 | 1,772 ft |
| September | 62.0 | 472 ft | 76.4 | 1,396 ft |
| October | 52.3 | −169 ft | 63.7 | 582 ft |
| November | 44.6 | −688 ft | 52.6 | −149 ft |
| December | 39.8 | −1,017 ft | 46.2 | −579 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 KHIO
DENSITY ALTITUDE
Field elevation 208 ft — the air behaves like 1,747 ft.
- PRESSURE ALT
- 209 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
- 4S4 — Skyport
Cornelius · elev 174 ft
- 7S3 — Stark'S Twin Oaks Airpark
Hillsboro · elev 170 ft
- 17S — Chehalem Airpark
Newberg · elev 190 ft
- KSPB — Scappoose
Scappoose · elev 58 ft
- 2S6 — Sportsman Airpark
Newberg · elev 181 ft
- KPDX — Portland International
Portland · elev 31 ft
- KUAO — Aurora State
Aurora · elev 200 ft
- KMMV — Mc Minnville Municipal
Mc Minnville · elev 163 ft
Frequently asked questions
How high does density altitude get at KHIO in summer?
On a typical August afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Portland-Hillsboro reaches roughly 1,772 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 KHIO on an average day?
It swings with the seasons: from roughly −1,017 ft at the coldest month's average temperature to about 809 ft at the warmest month's — all from a constant field elevation of 208 ft. The month-by-month table above carries the full year.
What is the field elevation of Portland-Hillsboro?
208 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KHIO (ICAO) / HIO (FAA), in Portland, Oregon.