Silverdale, Washington · field elev 525 ft
Density Altitude at Apex Airpark (8W5)
Apex Airpark sits at 525 ft, and even a typical August afternoon (77 °F) only lifts density altitude to about 1,841 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 | 41.1 | −533 ft | 46.6 | −159 ft |
| February | 42.3 | −451 ft | 49.4 | 30 ft |
| March | 45.7 | −220 ft | 53.7 | 317 ft |
| April | 50.0 | 70 ft | 59.0 | 666 ft |
| May | 56.2 | 482 ft | 65.8 | 1,109 ft |
| June | 60.7 | 778 ft | 70.2 | 1,391 ft |
| July | 65.6 | 1,096 ft | 76.5 | 1,790 ft |
| August | 66.2 | 1,134 ft | 77.3 | 1,841 ft |
| September | 61.5 | 830 ft | 71.9 | 1,499 ft |
| October | 52.6 | 243 ft | 60.6 | 771 ft |
| November | 45.0 | −267 ft | 51.2 | 150 ft |
| December | 40.3 | −588 ft | 45.6 | −227 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 8W5
DENSITY ALTITUDE
Field elevation 525 ft — the air behaves like 1,822 ft.
- PRESSURE ALT
- 526 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 Washington fields
- KPWT — Bremerton Ntl
Bremerton · elev 444 ft
- 2S1 — Vashon Municipal
Vashon · elev 316 ft
- KBFI — Boeing Field/King County International
Seattle · elev 22 ft
- KSEA — Seattle-Tacoma International
Seattle · elev 432 ft
- KRNT — Renton Municipal
Renton · elev 32 ft
- KPAE — Seattle Paine Field International
Everett · elev 607 ft
- 0S9 — Jefferson County International
Port Townsend · elev 110 ft
- KTIW — Tacoma Narrows
Tacoma · elev 295 ft
Frequently asked questions
How high does density altitude get at 8W5 in summer?
On a typical August afternoon — around 77 °F at the nearest NOAA normals station — density altitude at Apex Airpark reaches roughly 1,841 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 8W5 on an average day?
It swings with the seasons: from roughly −588 ft at the coldest month's average temperature to about 1,134 ft at the warmest month's — all from a constant field elevation of 525 ft. The month-by-month table above carries the full year.
What is the field elevation of Apex Airpark?
525 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 8W5 (FAA), in Silverdale, Washington.