Thayer, Missouri · field elev 808 ft
Density Altitude at Thayer Meml (42M)
Thayer Meml sits at 808 ft, and even a typical July afternoon (90 °F) only lifts density altitude to about 2,990 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 | 34.8 | −615 ft | 46.8 | 206 ft |
| February | 39.0 | −325 ft | 51.5 | 520 ft |
| March | 48.0 | 286 ft | 60.8 | 1,133 ft |
| April | 57.4 | 911 ft | 70.7 | 1,770 ft |
| May | 66.1 | 1,476 ft | 78.2 | 2,243 ft |
| June | 74.4 | 2,005 ft | 86.2 | 2,739 ft |
| July | 78.4 | 2,256 ft | 90.3 | 2,990 ft |
| August | 77.2 | 2,181 ft | 89.6 | 2,947 ft |
| September | 69.5 | 1,694 ft | 82.4 | 2,505 ft |
| October | 58.2 | 963 ft | 72.3 | 1,872 ft |
| November | 47.1 | 226 ft | 60.0 | 1,081 ft |
| December | 38.2 | −380 ft | 49.8 | 407 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 42M
DENSITY ALTITUDE
Field elevation 808 ft — the air behaves like 2,971 ft.
- PRESSURE ALT
- 809 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
- KUNO — West Plains Regional
West Plains · elev 1,228 ft
- KMNF — Mountain View
Mountain View · elev 1,182 ft
- 1H5 — Willow Springs Meml
Willow Springs · elev 1,247 ft
- X33 — Doniphan Municipal
Doniphan · elev 635 ft
- MO5 — Bollinger-Crass Meml
Van Buren · elev 652 ft
- KTVB — Cabool Meml
Cabool · elev 1,220 ft
- 1MO — Mountain Grove Meml
Mountain Grove · elev 1,476 ft
- M48 — Houston Meml
Houston · elev 1,195 ft
Frequently asked questions
How high does density altitude get at 42M in summer?
On a typical July afternoon — around 90 °F at the nearest NOAA normals station — density altitude at Thayer Meml reaches roughly 2,990 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 42M on an average day?
It swings with the seasons: from roughly −615 ft at the coldest month's average temperature to about 2,256 ft at the warmest month's — all from a constant field elevation of 808 ft. The month-by-month table above carries the full year.
What is the field elevation of Thayer Meml?
808 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 42M (FAA), in Thayer, Missouri.