Tonasket, Washington · field elev 1,311 ft
Density Altitude at Tonasket Municipal (W01)
Tonasket Municipal sits at 1,311 ft, and even a typical July afternoon (88 °F) only lifts density altitude to about 3,468 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 | 28.6 | −419 ft | 33.8 | −57 ft |
| February | 34.1 | −36 ft | 42.3 | 526 ft |
| March | 42.7 | 553 ft | 54.2 | 1,321 ft |
| April | 50.7 | 1,090 ft | 64.2 | 1,972 ft |
| May | 58.9 | 1,629 ft | 73.8 | 2,583 ft |
| June | 64.5 | 1,991 ft | 79.3 | 2,927 ft |
| July | 71.7 | 2,450 ft | 88.1 | 3,468 ft |
| August | 70.5 | 2,374 ft | 86.9 | 3,394 ft |
| September | 61.2 | 1,778 ft | 76.5 | 2,752 ft |
| October | 48.6 | 950 ft | 60.6 | 1,740 ft |
| November | 36.4 | 123 ft | 44.1 | 648 ft |
| December | 28.9 | −398 ft | 33.6 | −70 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 W01
DENSITY ALTITUDE
Field elevation 1,311 ft — the air behaves like 3,462 ft.
- PRESSURE ALT
- 1,312 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
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- S35 — Okanogan Legion
Okanogan · elev 1,042 ft
- R49 — Ferry County
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- S52 — Methow Valley State
Winthrop · elev 1,706 ft
- 2S0 — Twisp Municipal
Twisp · elev 1,602 ft
- S97 — Anderson Field
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- W12 — Lost River
Mazama · elev 2,415 ft
Frequently asked questions
How high does density altitude get at W01 in summer?
On a typical July afternoon — around 88 °F at the nearest NOAA normals station — density altitude at Tonasket Municipal reaches roughly 3,468 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 W01 on an average day?
It swings with the seasons: from roughly −419 ft at the coldest month's average temperature to about 2,450 ft at the warmest month's — all from a constant field elevation of 1,311 ft. The month-by-month table above carries the full year.
What is the field elevation of Tonasket Municipal?
1,311 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is W01 (FAA), in Tonasket, Washington.