Rock, Michigan · field elev 970 ft
Density Altitude at Van Effen Field (6Y4)
Van Effen Field sits at 970 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,665 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 | 17.8 | −1,616 ft | 27.3 | −937 ft |
| February | 19.8 | −1,472 ft | 30.4 | −719 ft |
| March | 29.4 | −789 ft | 40.7 | −7 ft |
| April | 40.7 | −7 ft | 52.6 | 794 ft |
| May | 53.3 | 840 ft | 66.2 | 1,681 ft |
| June | 63.4 | 1,501 ft | 76.4 | 2,329 ft |
| July | 68.4 | 1,822 ft | 81.8 | 2,665 ft |
| August | 67.4 | 1,758 ft | 80.8 | 2,603 ft |
| September | 59.3 | 1,235 ft | 72.0 | 2,051 ft |
| October | 47.1 | 427 ft | 58.0 | 1,150 ft |
| November | 35.3 | −378 ft | 44.3 | 238 ft |
| December | 24.2 | −1,157 ft | 32.8 | −551 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 6Y4
DENSITY ALTITUDE
Field elevation 970 ft — the air behaves like 2,678 ft.
- PRESSURE ALT
- 971 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
- KSAW — Marquette/Sawyer Regional
Marquette · elev 1,205 ft
- KESC — Delta County
Escanaba · elev 609 ft
- M61 — Edward F Johnson
Ishpeming · elev 1,446 ft
- 5Y7 — Hanley Field
Munising · elev 984 ft
- KIMT — Ford
Iron Mountain Kingsford · elev 1,182 ft
- 50D — Iron County
Crystal Falls · elev 1,340 ft
- KISQ — Schoolcraft County
Manistique · elev 684 ft
- Y73 — Stambaugh
Iron River · elev 1,618 ft
Frequently asked questions
How high does density altitude get at 6Y4 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Van Effen Field reaches roughly 2,665 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 6Y4 on an average day?
It swings with the seasons: from roughly −1,616 ft at the coldest month's average temperature to about 1,822 ft at the warmest month's — all from a constant field elevation of 970 ft. The month-by-month table above carries the full year.
What is the field elevation of Van Effen Field?
970 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 6Y4 (FAA), in Rock, Michigan.