Hillsboro, Oregon · field elev 170 ft
Density Altitude at Stark'S Twin Oaks Airpark (7S3)
Stark'S Twin Oaks Airpark sits at 170 ft, and even a typical August afternoon (82 °F) only lifts density altitude to about 1,694 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 | 45.1 | −701 ft | 49.7 | −390 ft |
| February | 47.2 | −559 ft | 54.3 | −83 ft |
| March | 49.9 | −377 ft | 57.9 | 156 ft |
| April | 53.8 | −116 ft | 63.0 | 490 ft |
| May | 59.7 | 274 ft | 69.8 | 929 ft |
| June | 63.2 | 503 ft | 73.3 | 1,153 ft |
| July | 68.6 | 852 ft | 80.7 | 1,619 ft |
| August | 69.4 | 904 ft | 81.9 | 1,694 ft |
| September | 64.2 | 568 ft | 75.9 | 1,318 ft |
| October | 56.0 | 30 ft | 64.8 | 607 ft |
| November | 48.7 | −458 ft | 54.7 | −56 ft |
| December | 44.1 | −769 ft | 48.6 | −464 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 7S3
DENSITY ALTITUDE
Field elevation 170 ft — the air behaves like 1,700 ft.
- PRESSURE ALT
- 171 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
- KHIO — Portland-Hillsboro
Portland · elev 208 ft
- 17S — Chehalem Airpark
Newberg · elev 190 ft
- 2S6 — Sportsman Airpark
Newberg · elev 181 ft
- 4S4 — Skyport
Cornelius · elev 174 ft
- KUAO — Aurora State
Aurora · elev 200 ft
- KMMV — Mc Minnville Municipal
Mc Minnville · elev 163 ft
- 7S9 — Lenhardt Airpark
Hubbard · elev 165 ft
- KPDX — Portland International
Portland · elev 31 ft
Frequently asked questions
How high does density altitude get at 7S3 in summer?
On a typical August afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Stark'S Twin Oaks Airpark reaches roughly 1,694 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 7S3 on an average day?
It swings with the seasons: from roughly −769 ft at the coldest month's average temperature to about 904 ft at the warmest month's — all from a constant field elevation of 170 ft. The month-by-month table above carries the full year.
What is the field elevation of Stark'S Twin Oaks Airpark?
170 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7S3 (FAA), in Hillsboro, Oregon.