Port Angeles, Washington · field elev 291 ft
Density Altitude at William R Fairchild International (KCLM)
William R Fairchild International sits at 291 ft, and even a typical August afternoon (70 °F) only lifts density altitude to about 1,072 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 | 39.2 | −955 ft | 45.3 | −537 ft |
| February | 39.8 | −913 ft | 46.6 | −449 ft |
| March | 42.4 | −735 ft | 49.8 | −234 ft |
| April | 46.5 | −456 ft | 54.2 | 60 ft |
| May | 51.5 | −120 ft | 59.5 | 410 ft |
| June | 55.4 | 140 ft | 63.4 | 665 ft |
| July | 59.7 | 423 ft | 68.2 | 975 ft |
| August | 60.4 | 469 ft | 69.7 | 1,072 ft |
| September | 56.6 | 219 ft | 66.1 | 840 ft |
| October | 49.2 | −274 ft | 56.7 | 226 ft |
| November | 42.7 | −715 ft | 49.4 | −260 ft |
| December | 39.1 | −962 ft | 44.8 | −571 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 KCLM
DENSITY ALTITUDE
Field elevation 291 ft — the air behaves like 1,091 ft.
- PRESSURE ALT
- 292 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
- W28 — Sequim Valley
Sequim · elev 151 ft
- 0S9 — Jefferson County International
Port Townsend · elev 110 ft
- KFHR — Friday Harbor
Friday Harbor · elev 113 ft
- S31 — Lopez Island
Lopez · elev 209 ft
- 11S — Sekiu
Sekiu · elev 355 ft
- KOKH — Delaurentis
Oak Harbor · elev 193 ft
- S18 — Forks
Forks · elev 299 ft
- 74S — Anacortes
Anacortes · elev 246 ft
Frequently asked questions
How high does density altitude get at KCLM in summer?
On a typical August afternoon — around 70 °F at the nearest NOAA normals station — density altitude at William R Fairchild International reaches roughly 1,072 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 KCLM on an average day?
It swings with the seasons: from roughly −962 ft at the coldest month's average temperature to about 469 ft at the warmest month's — all from a constant field elevation of 291 ft. The month-by-month table above carries the full year.
What is the field elevation of William R Fairchild International?
291 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KCLM (ICAO) / CLM (FAA), in Port Angeles, Washington.