Fort Leonard Wood, Missouri · field elev 1,160 ft
Density Altitude at Waynesville-St Robert Regional Forney Field (KTBN)
Waynesville-St Robert Regional Forney Field sits at 1,160 ft, and even a typical July afternoon (88 °F) only lifts density altitude to about 3,302 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 | 31.8 | −384 ft | 42.0 | 318 ft |
| February | 36.4 | −65 ft | 47.1 | 662 ft |
| March | 44.9 | 514 ft | 56.6 | 1,293 ft |
| April | 55.4 | 1,214 ft | 67.6 | 2,005 ft |
| May | 64.3 | 1,793 ft | 75.3 | 2,492 ft |
| June | 72.7 | 2,329 ft | 83.3 | 2,990 ft |
| July | 77.1 | 2,605 ft | 88.4 | 3,302 ft |
| August | 75.6 | 2,511 ft | 87.2 | 3,229 ft |
| September | 68.2 | 2,043 ft | 80.2 | 2,798 ft |
| October | 56.9 | 1,312 ft | 69.0 | 2,094 ft |
| November | 45.0 | 521 ft | 56.3 | 1,273 ft |
| December | 35.7 | −113 ft | 45.7 | 568 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 KTBN
DENSITY ALTITUDE
Field elevation 1,160 ft — the air behaves like 3,278 ft.
- PRESSURE ALT
- 1,161 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 Missouri fields
- MO1 — Richland Municipal
Richland · elev 1,110 ft
- K07 — Rolla Downtown
Rolla · elev 987 ft
- KLBO — Floyd W Jones Lebanon
Lebanon · elev 1,321 ft
- M48 — Houston Meml
Houston · elev 1,195 ft
- K33 — Salem Meml
Salem · elev 1,241 ft
- KAIZ — Lee C Fine Meml
Kaiser/Lake Ozark · elev 869 ft
- KVIH — Rolla Ntl
Rolla/Vichy · elev 1,148 ft
- KOZS — Camdenton Meml-Lake Regional
Camdenton · elev 1,062 ft
Frequently asked questions
How high does density altitude get at KTBN in summer?
On a typical July afternoon — around 88 °F at the nearest NOAA normals station — density altitude at Waynesville-St Robert Regional Forney Field reaches roughly 3,302 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 KTBN on an average day?
It swings with the seasons: from roughly −384 ft at the coldest month's average temperature to about 2,605 ft at the warmest month's — all from a constant field elevation of 1,160 ft. The month-by-month table above carries the full year.
What is the field elevation of Waynesville-St Robert Regional Forney Field?
1,160 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTBN (ICAO) / TBN (FAA), in Fort Leonard Wood, Missouri.