Metaline Falls, Washington · field elev 2,614 ft
Density Altitude at Sullivan Lake State (09S)
Sullivan Lake State sits at 2,614 ft, and even a typical August afternoon (85 °F) only lifts density altitude to about 4,840 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 | 26.7 | 1,076 ft | 32.6 | 1,484 ft |
| February | 29.9 | 1,298 ft | 38.3 | 1,873 ft |
| March | 37.1 | 1,791 ft | 47.5 | 2,489 ft |
| April | 45.3 | 2,343 ft | 58.0 | 3,175 ft |
| May | 54.0 | 2,916 ft | 67.2 | 3,763 ft |
| June | 60.1 | 3,310 ft | 72.4 | 4,089 ft |
| July | 67.8 | 3,800 ft | 83.6 | 4,779 ft |
| August | 67.2 | 3,763 ft | 84.6 | 4,840 ft |
| September | 57.8 | 3,162 ft | 72.9 | 4,120 ft |
| October | 45.2 | 2,336 ft | 55.7 | 3,026 ft |
| November | 34.2 | 1,594 ft | 40.3 | 2,008 ft |
| December | 26.8 | 1,083 ft | 32.2 | 1,457 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 09S
DENSITY ALTITUDE
Field elevation 2,614 ft — the air behaves like 4,864 ft.
- PRESSURE ALT
- 2,616 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
- S23 — Ione Municipal
Ione · elev 2,110 ft
- 63S — Colville Municipal
Colville · elev 1,883 ft
- 1S9 — Chewelah Municipal
Chewelah · elev 2,084 ft
- 69S — Avey Field
Laurier · elev 1,655 ft
- KDEW — Deer Park
Deer Park · elev 2,211 ft
- R49 — Ferry County
Republic · elev 2,522 ft
- 70S — Mead Flying Service
Mead · elev 1,905 ft
- KSFF — Felts Field
Spokane · elev 1,957 ft
Frequently asked questions
How high does density altitude get at 09S in summer?
On a typical August afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Sullivan Lake State reaches roughly 4,840 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 09S on an average day?
It swings with the seasons: from roughly 1,076 ft at the coldest month's average temperature to about 3,800 ft at the warmest month's — all from a constant field elevation of 2,614 ft. The month-by-month table above carries the full year.
What is the field elevation of Sullivan Lake State?
2,614 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 09S (FAA), in Metaline Falls, Washington.