Bonne Terre, Missouri · field elev 910 ft
Density Altitude at Bonne Terre Municipal (1BT)
Bonne Terre Municipal sits at 910 ft, and even a typical July afternoon (89 °F) only lifts density altitude to about 3,004 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 | 32.7 | −633 ft | 42.8 | 62 ft |
| February | 36.8 | −349 ft | 47.9 | 406 ft |
| March | 46.0 | 278 ft | 57.8 | 1,063 ft |
| April | 56.5 | 977 ft | 68.7 | 1,768 ft |
| May | 65.5 | 1,563 ft | 77.0 | 2,293 ft |
| June | 73.7 | 2,085 ft | 84.8 | 2,777 ft |
| July | 77.7 | 2,337 ft | 88.5 | 3,004 ft |
| August | 76.3 | 2,249 ft | 87.7 | 2,955 ft |
| September | 68.5 | 1,755 ft | 80.7 | 2,524 ft |
| October | 57.4 | 1,036 ft | 70.0 | 1,851 ft |
| November | 45.6 | 251 ft | 56.7 | 991 ft |
| December | 36.4 | −377 ft | 46.4 | 305 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 1BT
DENSITY ALTITUDE
Field elevation 910 ft — the air behaves like 3,034 ft.
- PRESSURE ALT
- 911 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
- 8WC — Washington County
Potosi · elev 959 ft
- H57 — Bismarck Meml
Bismarck · elev 1,038 ft
- KFAM — Farmington Regional
Farmington · elev 946 ft
- H88 — A Paul Vance Fredericktown Regional
Fredericktown · elev 880 ft
- KUUV — Sullivan Regional
Sullivan · elev 933 ft
- KPCD — Perryville Regional
Perryville · elev 373 ft
- KUBX — Cuba Municipal
Cuba · elev 1,023 ft
- KSUS — Spirit Of St Louis
St Louis · elev 463 ft
Frequently asked questions
How high does density altitude get at 1BT in summer?
On a typical July afternoon — around 89 °F at the nearest NOAA normals station — density altitude at Bonne Terre Municipal reaches roughly 3,004 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 1BT on an average day?
It swings with the seasons: from roughly −633 ft at the coldest month's average temperature to about 2,337 ft at the warmest month's — all from a constant field elevation of 910 ft. The month-by-month table above carries the full year.
What is the field elevation of Bonne Terre Municipal?
910 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 1BT (FAA), in Bonne Terre, Missouri.