Greenwater, Washington · field elev 2,650 ft
Density Altitude at Ranger Creek (21W)
Ranger Creek sits at 2,650 ft, and even a typical August afternoon (76 °F) only lifts density altitude to about 4,332 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 | 31.6 | 1,460 ft | 37.2 | 1,843 ft |
| February | 33.0 | 1,556 ft | 40.2 | 2,046 ft |
| March | 36.2 | 1,775 ft | 44.6 | 2,341 ft |
| April | 40.6 | 2,073 ft | 50.5 | 2,731 ft |
| May | 48.4 | 2,593 ft | 59.9 | 3,342 ft |
| June | 53.7 | 2,941 ft | 65.9 | 3,725 ft |
| July | 60.8 | 3,400 ft | 75.3 | 4,313 ft |
| August | 60.9 | 3,406 ft | 75.6 | 4,332 ft |
| September | 55.1 | 3,032 ft | 68.6 | 3,895 ft |
| October | 44.8 | 2,354 ft | 54.5 | 2,993 ft |
| November | 35.9 | 1,755 ft | 42.5 | 2,200 ft |
| December | 30.8 | 1,405 ft | 36.4 | 1,789 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 21W
DENSITY ALTITUDE
Field elevation 2,650 ft — the air behaves like 4,357 ft.
- PRESSURE ALT
- 2,652 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
- KESW — Easton State
Easton · elev 2,226 ft
- 4W0 — Bandera State
Bandera · elev 1,636 ft
- 55S — Packwood
Packwood · elev 1,057 ft
- 4S6 — Tieton State
Rimrock · elev 2,964 ft
- S93 — Cle Elum Municipal
Cle Elum · elev 1,945 ft
- 2W1 — De Vere Field
Cle Elum · elev 1,800 ft
- S36 — Crest Airfield
Covington · elev 472 ft
- 2W3 — Swanson Field
Eatonville · elev 843 ft
Frequently asked questions
How high does density altitude get at 21W in summer?
On a typical August afternoon — around 76 °F at the nearest NOAA normals station — density altitude at Ranger Creek reaches roughly 4,332 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 21W on an average day?
It swings with the seasons: from roughly 1,405 ft at the coldest month's average temperature to about 3,406 ft at the warmest month's — all from a constant field elevation of 2,650 ft. The month-by-month table above carries the full year.
What is the field elevation of Ranger Creek?
2,650 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 21W (FAA), in Greenwater, Washington.