North Fox Island, Michigan · field elev 639 ft
Density Altitude at North Fox Island (6Y3)
North Fox Island sits at 639 ft, and even a typical July afternoon (76 °F) only lifts density altitude to about 1,905 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 | 21.0 | −1,801 ft | 26.7 | −1,394 ft |
| February | 21.3 | −1,779 ft | 28.3 | −1,281 ft |
| March | 29.2 | −1,217 ft | 37.2 | −659 ft |
| April | 40.2 | −453 ft | 49.2 | 157 ft |
| May | 52.3 | 365 ft | 62.6 | 1,042 ft |
| June | 61.9 | 996 ft | 71.7 | 1,626 ft |
| July | 67.2 | 1,339 ft | 76.1 | 1,905 ft |
| August | 66.9 | 1,320 ft | 75.0 | 1,835 ft |
| September | 60.0 | 872 ft | 67.6 | 1,365 ft |
| October | 48.4 | 104 ft | 54.9 | 537 ft |
| November | 37.5 | −638 ft | 43.1 | −255 ft |
| December | 27.9 | −1,309 ft | 32.9 | −958 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 6Y3
DENSITY ALTITUDE
Field elevation 639 ft — the air behaves like 1,898 ft.
- PRESSURE ALT
- 640 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
- KSJX — Beaver Island
Beaver Island · elev 670 ft
- 6Y8 — Welke
Beaver Island · elev 664 ft
- 5D5 — Woolsey Meml
Northport · elev 628 ft
- KCVX — Charlevoix Municipal
Charlevoix · elev 669 ft
- 59M — Torchport
Eastport · elev 640 ft
- KISQ — Schoolcraft County
Manistique · elev 684 ft
- Y94 — East Jordan City
East Jordan · elev 641 ft
- KMGN — Harbor Springs
Harbor Springs · elev 686 ft
Frequently asked questions
How high does density altitude get at 6Y3 in summer?
On a typical July afternoon — around 76 °F at the nearest NOAA normals station — density altitude at North Fox Island reaches roughly 1,905 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 6Y3 on an average day?
It swings with the seasons: from roughly −1,801 ft at the coldest month's average temperature to about 1,339 ft at the warmest month's — all from a constant field elevation of 639 ft. The month-by-month table above carries the full year.
What is the field elevation of North Fox Island?
639 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 6Y3 (FAA), in North Fox Island, Michigan.