Friday Harbor, Washington · field elev 113 ft
Density Altitude at Friday Harbor (KFHR)
Friday Harbor sits at 113 ft, and even a typical August afternoon (73 °F) only lifts density altitude to about 1,083 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 | 42.1 | −977 ft | 47.1 | −636 ft |
| February | 42.5 | −950 ft | 48.5 | −542 ft |
| March | 45.5 | −745 ft | 52.6 | −267 ft |
| April | 49.1 | −501 ft | 57.4 | 52 ft |
| May | 54.0 | −173 ft | 63.7 | 465 ft |
| June | 58.2 | 105 ft | 68.4 | 769 ft |
| July | 61.2 | 302 ft | 72.4 | 1,026 ft |
| August | 61.6 | 328 ft | 73.3 | 1,083 ft |
| September | 58.0 | 92 ft | 68.1 | 750 ft |
| October | 51.2 | −360 ft | 58.5 | 125 ft |
| November | 45.4 | −752 ft | 51.0 | −374 ft |
| December | 41.6 | −1,011 ft | 46.3 | −691 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 KFHR
DENSITY ALTITUDE
Field elevation 113 ft — the air behaves like 1,064 ft.
- PRESSURE ALT
- 114 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
- S31 — Lopez Island
Lopez · elev 209 ft
- KORS — Orcas Island
Eastsound · elev 35 ft
- 74S — Anacortes
Anacortes · elev 246 ft
- KOKH — Delaurentis
Oak Harbor · elev 193 ft
- KBVS — Skagit Regional
Burlington/Mount Vernon · elev 145 ft
- KBLI — Bellingham International
Bellingham · elev 171 ft
- W28 — Sequim Valley
Sequim · elev 151 ft
- 1RL — Point Roberts Airpark
Point Roberts · elev 11 ft
Frequently asked questions
How high does density altitude get at KFHR in summer?
On a typical August afternoon — around 73 °F at the nearest NOAA normals station — density altitude at Friday Harbor reaches roughly 1,083 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 KFHR on an average day?
It swings with the seasons: from roughly −1,011 ft at the coldest month's average temperature to about 328 ft at the warmest month's — all from a constant field elevation of 113 ft. The month-by-month table above carries the full year.
What is the field elevation of Friday Harbor?
113 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KFHR (ICAO) / FHR (FAA), in Friday Harbor, Washington.