Kahlotus, Washington · field elev 813 ft
Density Altitude at Lower Monumental State (W09)
Lower Monumental State sits at 813 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,953 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 | 32.9 | −740 ft | 39.2 | −305 ft |
| February | 37.5 | −422 ft | 46.1 | 165 ft |
| March | 44.1 | 29 ft | 55.8 | 812 ft |
| April | 51.0 | 493 ft | 64.7 | 1,392 ft |
| May | 59.1 | 1,028 ft | 73.8 | 1,973 ft |
| June | 65.2 | 1,424 ft | 80.3 | 2,380 ft |
| July | 72.4 | 1,884 ft | 89.6 | 2,953 ft |
| August | 71.4 | 1,821 ft | 88.1 | 2,861 ft |
| September | 63.3 | 1,301 ft | 79.2 | 2,312 ft |
| October | 50.8 | 480 ft | 63.9 | 1,340 ft |
| November | 39.5 | −284 ft | 47.6 | 266 ft |
| December | 32.9 | −740 ft | 38.5 | −353 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 W09
DENSITY ALTITUDE
Field elevation 813 ft — the air behaves like 2,977 ft.
- PRESSURE ALT
- 814 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
- 16W — Little Goose Lock And Dam
Starbuck · elev 681 ft
- 0S0 — Lind
Lind · elev 1,507 ft
- S70 — Othello Municipal
Othello · elev 1,149 ft
- KALW — Walla Walla Regional
Walla Walla · elev 1,194 ft
- KPSC — Tri-Cities
Pasco · elev 410 ft
- S95 — Martin Field
College Place · elev 750 ft
- 2S4 — Warden
Warden · elev 1,276 ft
- KRLD — Richland
Richland · elev 394 ft
Frequently asked questions
How high does density altitude get at W09 in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Lower Monumental State reaches roughly 2,953 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 W09 on an average day?
It swings with the seasons: from roughly −740 ft at the coldest month's average temperature to about 1,884 ft at the warmest month's — all from a constant field elevation of 813 ft. The month-by-month table above carries the full year.
What is the field elevation of Lower Monumental State?
813 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is W09 (FAA), in Kahlotus, Washington.