Morton, Washington · field elev 941 ft
Density Altitude at Strom Field (39P)
Strom Field sits at 941 ft, and even a typical August afternoon (80 °F) only lifts density altitude to about 2,499 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 | 38.3 | −207 ft | 44.9 | 243 ft |
| February | 40.1 | −84 ft | 48.7 | 498 ft |
| March | 43.6 | 155 ft | 52.8 | 771 ft |
| April | 48.0 | 451 ft | 58.9 | 1,173 ft |
| May | 54.6 | 890 ft | 66.9 | 1,691 ft |
| June | 59.3 | 1,199 ft | 72.0 | 2,016 ft |
| July | 64.4 | 1,530 ft | 79.1 | 2,462 ft |
| August | 63.8 | 1,491 ft | 79.7 | 2,499 ft |
| September | 58.4 | 1,140 ft | 73.1 | 2,085 ft |
| October | 50.0 | 585 ft | 60.6 | 1,284 ft |
| November | 41.8 | 32 ft | 49.7 | 565 ft |
| December | 38.0 | −228 ft | 44.4 | 209 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 39P
DENSITY ALTITUDE
Field elevation 941 ft — the air behaves like 2,518 ft.
- PRESSURE ALT
- 942 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
- 2W3 — Swanson Field
Eatonville · elev 843 ft
- KTDO — Ed Carlson Meml Field/South Lewis County
Toledo · elev 374 ft
- 55S — Packwood
Packwood · elev 1,057 ft
- KCLS — Chehalis-Centralia
Chehalis · elev 177 ft
- 3B8 — Shady Acres
Spanaway · elev 445 ft
- KPLU — Pierce County/Thun Field
Puyallup · elev 538 ft
- 44T — Hoskins Field
Olympia · elev 213 ft
- KOLM — Olympia Regional
Olympia · elev 208 ft
Frequently asked questions
How high does density altitude get at 39P in summer?
On a typical August afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Strom Field reaches roughly 2,499 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 39P on an average day?
It swings with the seasons: from roughly −228 ft at the coldest month's average temperature to about 1,530 ft at the warmest month's — all from a constant field elevation of 941 ft. The month-by-month table above carries the full year.
What is the field elevation of Strom Field?
941 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 39P (FAA), in Morton, Washington.