Brewster, Washington · field elev 920 ft
Density Altitude at Anderson Field (S97)
Anderson Field sits at 920 ft, and even a typical July afternoon (91 °F) only lifts density altitude to about 3,162 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 | 28.5 | −915 ft | 34.3 | −510 ft |
| February | 33.3 | −579 ft | 41.5 | −14 ft |
| March | 42.9 | 81 ft | 54.2 | 838 ft |
| April | 51.1 | 632 ft | 64.4 | 1,504 ft |
| May | 59.9 | 1,212 ft | 73.8 | 2,104 ft |
| June | 66.4 | 1,633 ft | 80.7 | 2,536 ft |
| July | 74.6 | 2,154 ft | 90.9 | 3,162 ft |
| August | 73.9 | 2,110 ft | 90.4 | 3,132 ft |
| September | 64.5 | 1,511 ft | 79.9 | 2,486 ft |
| October | 50.4 | 586 ft | 62.6 | 1,388 ft |
| November | 37.4 | −295 ft | 45.4 | 250 ft |
| December | 28.9 | −887 ft | 34.6 | −489 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 S97
DENSITY ALTITUDE
Field elevation 920 ft — the air behaves like 3,168 ft.
- PRESSURE ALT
- 921 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
- S35 — Okanogan Legion
Okanogan · elev 1,042 ft
- S10 — Lake Chelan
Chelan · elev 1,263 ft
- 8W3 — Mansfield
Mansfield · elev 2,272 ft
- 2S0 — Twisp Municipal
Twisp · elev 1,602 ft
- KOMK — Omak
Omak · elev 1,305 ft
- S52 — Methow Valley State
Winthrop · elev 1,706 ft
- 3W7 — Grand Coulee Dam
Electric City · elev 1,593 ft
- 2S5 — Waterville
Waterville · elev 2,645 ft
Frequently asked questions
How high does density altitude get at S97 in summer?
On a typical July afternoon — around 91 °F at the nearest NOAA normals station — density altitude at Anderson Field reaches roughly 3,162 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 S97 on an average day?
It swings with the seasons: from roughly −915 ft at the coldest month's average temperature to about 2,154 ft at the warmest month's — all from a constant field elevation of 920 ft. The month-by-month table above carries the full year.
What is the field elevation of Anderson Field?
920 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is S97 (FAA), in Brewster, Washington.