Fruitport, Michigan · field elev 630 ft
Density Altitude at Flying-A-Ranch (39Z)
Flying-A-Ranch sits at 630 ft, and even a typical July afternoon (80 °F) only lifts density altitude to about 2,138 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 | 25.5 | −1,490 ft | 31.7 | −1,053 ft |
| February | 26.4 | −1,426 ft | 33.2 | −948 ft |
| March | 34.0 | −892 ft | 42.4 | −313 ft |
| April | 45.3 | −116 ft | 54.7 | 513 ft |
| May | 57.0 | 665 ft | 67.1 | 1,321 ft |
| June | 66.7 | 1,296 ft | 76.4 | 1,913 ft |
| July | 71.0 | 1,571 ft | 80.0 | 2,138 ft |
| August | 69.4 | 1,469 ft | 78.9 | 2,069 ft |
| September | 62.7 | 1,037 ft | 72.9 | 1,692 ft |
| October | 51.3 | 287 ft | 60.0 | 861 ft |
| November | 39.8 | −491 ft | 46.7 | −22 ft |
| December | 30.9 | −1,109 ft | 36.5 | −719 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 39Z
DENSITY ALTITUDE
Field elevation 630 ft — the air behaves like 2,138 ft.
- PRESSURE ALT
- 631 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
- 5N7 — Hat Field
Nunica · elev 625 ft
- 73G — Cherry Field
Nunica · elev 629 ft
- 3GM — Grand Haven Meml Airpark
Grand Haven · elev 604 ft
- KMKG — Muskegon County
Muskegon · elev 628 ft
- 08C — Riverview
Jenison · elev 603 ft
- Z98 — Ottawa Exec
Zeeland · elev 756 ft
- 8D4 — Paul C Miller/Sparta
Sparta · elev 775 ft
- 24M — Wilderness Airpark
Kent City · elev 785 ft
Frequently asked questions
How high does density altitude get at 39Z in summer?
On a typical July afternoon — around 80 °F at the nearest NOAA normals station — density altitude at Flying-A-Ranch reaches roughly 2,138 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 39Z on an average day?
It swings with the seasons: from roughly −1,490 ft at the coldest month's average temperature to about 1,571 ft at the warmest month's — all from a constant field elevation of 630 ft. The month-by-month table above carries the full year.
What is the field elevation of Flying-A-Ranch?
630 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 39Z (FAA), in Fruitport, Michigan.