Manzanita, Oregon · field elev 30 ft
Density Altitude at Nehalem Bay State (3S7)
Nehalem Bay State sits at 30 ft, and even a typical August afternoon (69 °F) only lifts density altitude to about 706 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 | 44.5 | −916 ft | 51.9 | −416 ft |
| February | 44.7 | −903 ft | 53.1 | −336 ft |
| March | 46.0 | −814 ft | 54.8 | −223 ft |
| April | 48.3 | −658 ft | 57.2 | −64 ft |
| May | 52.4 | −383 ft | 61.1 | 193 ft |
| June | 55.9 | −150 ft | 64.1 | 389 ft |
| July | 59.0 | 55 ft | 67.7 | 622 ft |
| August | 59.7 | 101 ft | 69.0 | 706 ft |
| September | 57.6 | −37 ft | 68.4 | 667 ft |
| October | 52.6 | −369 ft | 62.5 | 285 ft |
| November | 47.2 | −733 ft | 55.5 | −176 ft |
| December | 43.5 | −985 ft | 50.6 | −503 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 3S7
DENSITY ALTITUDE
Field elevation 30 ft — the air behaves like 706 ft.
- PRESSURE ALT
- 31 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
- KTMK — Tillamook
Tillamook · elev 39 ft
- 56S — Seaside Municipal
Seaside · elev 12 ft
- KAST — Astoria Regional
Astoria · elev 15 ft
- KPFC — Pacific City State
Pacific City · elev 10 ft
- 05S — Vernonia Municipal
Vernonia · elev 650 ft
- 4S4 — Skyport
Cornelius · elev 174 ft
- KHIO — Portland-Hillsboro
Portland · elev 208 ft
- 17S — Chehalem Airpark
Newberg · elev 190 ft
Frequently asked questions
How high does density altitude get at 3S7 in summer?
On a typical August afternoon — around 69 °F at the nearest NOAA normals station — density altitude at Nehalem Bay State reaches roughly 706 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 3S7 on an average day?
It swings with the seasons: from roughly −985 ft at the coldest month's average temperature to about 101 ft at the warmest month's — all from a constant field elevation of 30 ft. The month-by-month table above carries the full year.
What is the field elevation of Nehalem Bay State?
30 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3S7 (FAA), in Manzanita, Oregon.