Hood River, Oregon · field elev 638 ft
Density Altitude at Ken Jernstedt Airfield (4S2)
Ken Jernstedt Airfield sits at 638 ft, and even a typical August afternoon (82 °F) only lifts density altitude to about 2,297 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 | 35.6 | −771 ft | 40.8 | −413 ft |
| February | 38.7 | −557 ft | 46.2 | −46 ft |
| March | 43.9 | −201 ft | 53.3 | 430 ft |
| April | 49.6 | 183 ft | 60.0 | 871 ft |
| May | 57.0 | 674 ft | 68.4 | 1,415 ft |
| June | 62.3 | 1,021 ft | 73.6 | 1,746 ft |
| July | 68.6 | 1,427 ft | 81.7 | 2,254 ft |
| August | 68.5 | 1,421 ft | 82.4 | 2,297 ft |
| September | 61.6 | 975 ft | 75.9 | 1,891 ft |
| October | 50.9 | 270 ft | 62.8 | 1,053 ft |
| November | 41.4 | −372 ft | 48.6 | 116 ft |
| December | 35.4 | −785 ft | 40.2 | −454 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 4S2
DENSITY ALTITUDE
Field elevation 638 ft — the air behaves like 2,272 ft.
- PRESSURE ALT
- 639 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
- KCZK — Cascade Locks State
Cascade Locks · elev 151 ft
- KDLS — Columbia Gorge Regional/The Dalles Municipal
The Dalles · elev 247 ft
- 03S — Sandy River
Sandy · elev 704 ft
- 35S — Wasco State
Wasco · elev 1,503 ft
- KTTD — Portland-Troutdale
Portland · elev 39 ft
- KPDX — Portland International
Portland · elev 31 ft
- 4S9 — Mulino State
Portland-Mulino · elev 260 ft
- KSPB — Scappoose
Scappoose · elev 58 ft
Frequently asked questions
How high does density altitude get at 4S2 in summer?
On a typical August afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Ken Jernstedt Airfield reaches roughly 2,297 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 4S2 on an average day?
It swings with the seasons: from roughly −785 ft at the coldest month's average temperature to about 1,427 ft at the warmest month's — all from a constant field elevation of 638 ft. The month-by-month table above carries the full year.
What is the field elevation of Ken Jernstedt Airfield?
638 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 4S2 (FAA), in Hood River, Oregon.