Anacortes, Washington · field elev 246 ft
Density Altitude at Anacortes (74S)
Anacortes sits at 246 ft, and even a typical August afternoon (75 °F) only lifts density altitude to about 1,354 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 | 42.5 | −784 ft | 48.1 | −404 ft |
| February | 43.7 | −702 ft | 50.5 | −242 ft |
| March | 47.0 | −478 ft | 54.4 | 18 ft |
| April | 51.3 | −189 ft | 59.3 | 342 ft |
| May | 56.8 | 177 ft | 65.7 | 759 ft |
| June | 60.9 | 447 ft | 69.9 | 1,029 ft |
| July | 64.5 | 681 ft | 74.7 | 1,335 ft |
| August | 64.7 | 694 ft | 75.0 | 1,354 ft |
| September | 60.7 | 433 ft | 70.1 | 1,042 ft |
| October | 53.4 | −49 ft | 61.1 | 460 ft |
| November | 46.5 | −512 ft | 52.8 | −89 ft |
| December | 41.9 | −825 ft | 47.3 | −458 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 74S
DENSITY ALTITUDE
Field elevation 246 ft — the air behaves like 1,354 ft.
- PRESSURE ALT
- 247 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
- KBVS — Skagit Regional
Burlington/Mount Vernon · elev 145 ft
- S31 — Lopez Island
Lopez · elev 209 ft
- KFHR — Friday Harbor
Friday Harbor · elev 113 ft
- KOKH — Delaurentis
Oak Harbor · elev 193 ft
- KORS — Orcas Island
Eastsound · elev 35 ft
- 13W — Camano Island Airfield
Stanwood · elev 145 ft
- KBLI — Bellingham International
Bellingham · elev 171 ft
- 0S9 — Jefferson County International
Port Townsend · elev 110 ft
Frequently asked questions
How high does density altitude get at 74S in summer?
On a typical August afternoon — around 75 °F at the nearest NOAA normals station — density altitude at Anacortes reaches roughly 1,354 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 74S on an average day?
It swings with the seasons: from roughly −825 ft at the coldest month's average temperature to about 694 ft at the warmest month's — all from a constant field elevation of 246 ft. The month-by-month table above carries the full year.
What is the field elevation of Anacortes?
246 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 74S (FAA), in Anacortes, Washington.