Monroe, Michigan · field elev 616 ft
Density Altitude at Custer (KTTF)
Custer sits at 616 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,400 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 | 25.4 | −1,515 ft | 32.9 | −986 ft |
| February | 27.3 | −1,380 ft | 35.3 | −819 ft |
| March | 35.9 | −778 ft | 45.0 | −154 ft |
| April | 47.8 | 35 ft | 57.9 | 706 ft |
| May | 59.3 | 798 ft | 69.3 | 1,445 ft |
| June | 69.6 | 1,464 ft | 79.9 | 2,115 ft |
| July | 73.5 | 1,712 ft | 84.5 | 2,400 ft |
| August | 71.3 | 1,573 ft | 81.6 | 2,221 ft |
| September | 64.4 | 1,130 ft | 74.8 | 1,795 ft |
| October | 52.6 | 356 ft | 63.0 | 1,039 ft |
| November | 40.9 | −433 ft | 49.3 | 136 ft |
| December | 30.7 | −1,140 ft | 37.8 | −646 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 KTTF
DENSITY ALTITUDE
Field elevation 616 ft — the air behaves like 2,431 ft.
- PRESSURE ALT
- 617 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 Michigan fields
- W87 — Buzzwick
Carleton · elev 609 ft
- 43G — Belleville
Belleville · elev 695 ft
- KONZ — Grosse Ile Municipal
Detroit/Grosse Ile · elev 591 ft
- KDUH — Toledo Suburban
Lambertville · elev 671 ft
- KDTW — Detroit Metro Wayne County
Detroit · elev 645 ft
- KYIP — Willow Run
Detroit · elev 716 ft
- 44G — Betz
Blissfield · elev 691 ft
- 22T — Tecumseh Mills
Tecumseh · elev 797 ft
Frequently asked questions
How high does density altitude get at KTTF in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Custer reaches roughly 2,400 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 KTTF on an average day?
It swings with the seasons: from roughly −1,515 ft at the coldest month's average temperature to about 1,712 ft at the warmest month's — all from a constant field elevation of 616 ft. The month-by-month table above carries the full year.
What is the field elevation of Custer?
616 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KTTF (ICAO) / TTF (FAA), in Monroe, Michigan.