Ilwaco, Washington · field elev 13 ft
Density Altitude at Port Of Ilwaco (7W1)
Port Of Ilwaco sits at 13 ft, and even a typical August afternoon (67 °F) only lifts density altitude to about 524 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 | 42.4 | −1,081 ft | 48.8 | −646 ft |
| February | 42.9 | −1,047 ft | 50.4 | −538 ft |
| March | 44.9 | −910 ft | 52.4 | −404 ft |
| April | 47.6 | −727 ft | 55.0 | −230 ft |
| May | 52.0 | −431 ft | 58.9 | 28 ft |
| June | 55.4 | −204 ft | 62.0 | 231 ft |
| July | 58.5 | 1 ft | 65.2 | 440 ft |
| August | 59.0 | 34 ft | 66.5 | 524 ft |
| September | 56.9 | −104 ft | 66.0 | 491 ft |
| October | 51.0 | −498 ft | 59.7 | 80 ft |
| November | 45.4 | −876 ft | 52.5 | −397 ft |
| December | 42.0 | −1,108 ft | 48.2 | −686 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 7W1
DENSITY ALTITUDE
Field elevation 13 ft — the air behaves like 556 ft.
- PRESSURE ALT
- 14 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
- 2S9 — Willapa Harbor
South Bend/Raymond/ · elev 13 ft
- 14S — Westport
Westport · elev 14 ft
- KHQM — Bowerman Field
Hoquiam · elev 18 ft
- W04 — Ocean Shores Municipal
Ocean Shores · elev 15 ft
- KKLS — Southwest Washington Regional
Kelso · elev 20 ft
- KCLS — Chehalis-Centralia
Chehalis · elev 177 ft
- 8W9 — R & K Skyranch
Rochester · elev 149 ft
- S16 — Copalis State
Copalis · elev 1 ft
Frequently asked questions
How high does density altitude get at 7W1 in summer?
On a typical August afternoon — around 67 °F at the nearest NOAA normals station — density altitude at Port Of Ilwaco reaches roughly 524 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 7W1 on an average day?
It swings with the seasons: from roughly −1,108 ft at the coldest month's average temperature to about 34 ft at the warmest month's — all from a constant field elevation of 13 ft. The month-by-month table above carries the full year.
What is the field elevation of Port Of Ilwaco?
13 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 7W1 (FAA), in Ilwaco, Washington.