Tillamook, Oregon · field elev 39 ft
Density Altitude at Tillamook (KTMK)
Tillamook sits at 39 ft, and even a typical August afternoon (69 °F) only lifts density altitude to about 717 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 | 44.5 | −905 ft | 51.9 | −405 ft |
| February | 44.7 | −891 ft | 53.1 | −325 ft |
| March | 46.0 | −803 ft | 54.8 | −212 ft |
| April | 48.3 | −647 ft | 57.2 | −52 ft |
| May | 52.4 | −372 ft | 61.1 | 204 ft |
| June | 55.9 | −138 ft | 64.1 | 400 ft |
| July | 59.0 | 66 ft | 67.7 | 633 ft |
| August | 59.7 | 112 ft | 69.0 | 717 ft |
| September | 57.6 | −26 ft | 68.4 | 678 ft |
| October | 52.6 | −358 ft | 62.5 | 296 ft |
| November | 47.2 | −722 ft | 55.5 | −165 ft |
| December | 43.5 | −973 ft | 50.6 | −492 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 KTMK
DENSITY ALTITUDE
Field elevation 39 ft — the air behaves like 717 ft.
- PRESSURE ALT
- 40 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 Oregon fields
- KPFC — Pacific City State
Pacific City · elev 10 ft
- 3S7 — Nehalem Bay State
Manzanita · elev 30 ft
- KMMV — Mc Minnville Municipal
Mc Minnville · elev 163 ft
- 17S — Chehalem Airpark
Newberg · elev 190 ft
- 4S4 — Skyport
Cornelius · elev 174 ft
- S45 — Siletz Bay State
Gleneden Beach · elev 69 ft
- 05S — Vernonia Municipal
Vernonia · elev 650 ft
- 56S — Seaside Municipal
Seaside · elev 12 ft
Frequently asked questions
How high does density altitude get at KTMK in summer?
On a typical August afternoon — around 69 °F at the nearest NOAA normals station — density altitude at Tillamook reaches roughly 717 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 KTMK on an average day?
It swings with the seasons: from roughly −973 ft at the coldest month's average temperature to about 112 ft at the warmest month's — all from a constant field elevation of 39 ft. The month-by-month table above carries the full year.
What is the field elevation of Tillamook?
39 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTMK (ICAO) / TMK (FAA), in Tillamook, Oregon.