Kelso, Washington · field elev 20 ft
Density Altitude at Southwest Washington Regional (KKLS)
Southwest Washington Regional sits at 20 ft, and even a typical August afternoon (80 °F) only lifts density altitude to about 1,417 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 | 41.4 | −1,141 ft | 47.7 | −711 ft |
| February | 43.4 | −1,004 ft | 52.0 | −422 ft |
| March | 47.2 | −745 ft | 56.9 | −96 ft |
| April | 51.2 | −476 ft | 62.1 | 246 ft |
| May | 57.1 | −82 ft | 68.8 | 681 ft |
| June | 61.2 | 187 ft | 72.9 | 943 ft |
| July | 66.4 | 526 ft | 79.3 | 1,348 ft |
| August | 66.9 | 558 ft | 80.4 | 1,417 ft |
| September | 62.6 | 279 ft | 75.7 | 1,121 ft |
| October | 54.0 | −288 ft | 64.0 | 370 ft |
| November | 45.8 | −840 ft | 53.0 | −355 ft |
| December | 40.7 | −1,189 ft | 46.6 | −786 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 KKLS
DENSITY ALTITUDE
Field elevation 20 ft — the air behaves like 1,392 ft.
- PRESSURE ALT
- 21 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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- KVUO — Pearson Field
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- KCLS — Chehalis-Centralia
Chehalis · elev 177 ft
- 1W1 — Grove Field
Camas · elev 429 ft
Frequently asked questions
How high does density altitude get at KKLS in summer?
On a typical August afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Southwest Washington Regional reaches roughly 1,417 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 KKLS on an average day?
It swings with the seasons: from roughly −1,189 ft at the coldest month's average temperature to about 558 ft at the warmest month's — all from a constant field elevation of 20 ft. The month-by-month table above carries the full year.
What is the field elevation of Southwest Washington Regional?
20 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KKLS (ICAO) / KLS (FAA), in Kelso, Washington.