Toledo, Washington · field elev 374 ft
Density Altitude at Ed Carlson Meml Field/South Lewis County (KTDO)
Ed Carlson Meml Field/South Lewis County sits at 374 ft, and even a typical August afternoon (81 °F) only lifts density altitude to about 1,875 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 | 40.6 | −755 ft | 46.2 | −373 ft |
| February | 42.5 | −625 ft | 51.0 | −50 ft |
| March | 46.6 | −346 ft | 55.6 | 256 ft |
| April | 50.9 | −57 ft | 60.8 | 598 ft |
| May | 56.9 | 342 ft | 67.7 | 1,045 ft |
| June | 60.9 | 604 ft | 72.1 | 1,327 ft |
| July | 65.7 | 916 ft | 79.0 | 1,762 ft |
| August | 66.0 | 936 ft | 80.8 | 1,875 ft |
| September | 60.9 | 604 ft | 75.1 | 1,517 ft |
| October | 52.4 | 43 ft | 62.4 | 702 ft |
| November | 44.4 | −495 ft | 51.5 | −17 ft |
| December | 39.8 | −810 ft | 44.9 | −462 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 KTDO
DENSITY ALTITUDE
Field elevation 374 ft — the air behaves like 1,887 ft.
- PRESSURE ALT
- 375 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
- KCLS — Chehalis-Centralia
Chehalis · elev 177 ft
- KKLS — Southwest Washington Regional
Kelso · elev 20 ft
- 39P — Strom Field
Morton · elev 941 ft
- 8W9 — R & K Skyranch
Rochester · elev 149 ft
- KOLM — Olympia Regional
Olympia · elev 208 ft
- 44T — Hoskins Field
Olympia · elev 213 ft
- 2W3 — Swanson Field
Eatonville · elev 843 ft
- W27 — Woodland State
Woodland · elev 29 ft
Frequently asked questions
How high does density altitude get at KTDO in summer?
On a typical August afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Ed Carlson Meml Field/South Lewis County reaches roughly 1,875 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 KTDO on an average day?
It swings with the seasons: from roughly −810 ft at the coldest month's average temperature to about 936 ft at the warmest month's — all from a constant field elevation of 374 ft. The month-by-month table above carries the full year.
What is the field elevation of Ed Carlson Meml Field/South Lewis County?
374 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTDO (ICAO) / TDO (FAA), in Toledo, Washington.