Eatonville, Washington · field elev 843 ft
Density Altitude at Swanson Field (2W3)
Swanson Field sits at 843 ft, and even a typical August afternoon (80 °F) only lifts density altitude to about 2,380 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 | 38.3 | −329 ft | 44.9 | 121 ft |
| February | 40.1 | −206 ft | 48.7 | 377 ft |
| March | 43.6 | 33 ft | 52.8 | 650 ft |
| April | 48.0 | 330 ft | 58.9 | 1,052 ft |
| May | 54.6 | 769 ft | 66.9 | 1,570 ft |
| June | 59.3 | 1,078 ft | 72.0 | 1,896 ft |
| July | 64.4 | 1,409 ft | 79.1 | 2,342 ft |
| August | 63.8 | 1,371 ft | 79.7 | 2,380 ft |
| September | 58.4 | 1,019 ft | 73.1 | 1,965 ft |
| October | 50.0 | 464 ft | 60.6 | 1,163 ft |
| November | 41.8 | −90 ft | 49.7 | 444 ft |
| December | 38.0 | −350 ft | 44.4 | 87 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 2W3
DENSITY ALTITUDE
Field elevation 843 ft — the air behaves like 2,398 ft.
- PRESSURE ALT
- 844 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
- 3B8 — Shady Acres
Spanaway · elev 445 ft
- KPLU — Pierce County/Thun Field
Puyallup · elev 538 ft
- 39P — Strom Field
Morton · elev 941 ft
- 44T — Hoskins Field
Olympia · elev 213 ft
- KOLM — Olympia Regional
Olympia · elev 208 ft
- KTIW — Tacoma Narrows
Tacoma · elev 295 ft
- S50 — Auburn Municipal
Auburn · elev 63 ft
- S36 — Crest Airfield
Covington · elev 472 ft
Frequently asked questions
How high does density altitude get at 2W3 in summer?
On a typical August afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Swanson Field reaches roughly 2,380 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 2W3 on an average day?
It swings with the seasons: from roughly −350 ft at the coldest month's average temperature to about 1,409 ft at the warmest month's — all from a constant field elevation of 843 ft. The month-by-month table above carries the full year.
What is the field elevation of Swanson Field?
843 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 2W3 (FAA), in Eatonville, Washington.