St Ignace, Michigan · field elev 624 ft
Density Altitude at Mackinac County (83D)
Mackinac County sits at 624 ft, and even a typical July afternoon (76 °F) only lifts density altitude to about 1,849 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 | 17.9 | −2,044 ft | 24.6 | −1,562 ft |
| February | 18.0 | −2,037 ft | 25.9 | −1,470 ft |
| March | 26.6 | −1,420 ft | 35.0 | −830 ft |
| April | 38.1 | −616 ft | 46.8 | −23 ft |
| May | 49.5 | 159 ft | 59.0 | 788 ft |
| June | 60.5 | 887 ft | 70.2 | 1,512 ft |
| July | 66.3 | 1,263 ft | 75.5 | 1,849 ft |
| August | 65.5 | 1,211 ft | 74.8 | 1,804 ft |
| September | 58.7 | 769 ft | 67.8 | 1,359 ft |
| October | 47.1 | −2 ft | 55.0 | 525 ft |
| November | 35.6 | −789 ft | 41.7 | −369 ft |
| December | 25.8 | −1,477 ft | 31.7 | −1,060 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 83D
DENSITY ALTITUDE
Field elevation 624 ft — the air behaves like 1,880 ft.
- PRESSURE ALT
- 625 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
- KMCD — Mackinac Island
Mackinac Island · elev 741 ft
- 6Y1 — Bois Blanc Island
Bois Blanc Island · elev 664 ft
- 5Y1 — Albert J Lindberg
Hessel · elev 760 ft
- KSLH — Cheboygan County
Cheboygan · elev 640 ft
- KPLN — Pellston Regional/Emmet County
Pellston · elev 721 ft
- Y30 — Pbeaaye
Topinabee · elev 690 ft
- KCIU — Chippewa County International
Sault Ste Marie · elev 799 ft
- 2M7 — Hoffman'S Black Mountain Aerodrome
Cheboygan · elev 677 ft
Frequently asked questions
How high does density altitude get at 83D in summer?
On a typical July afternoon — around 76 °F at the nearest NOAA normals station — density altitude at Mackinac County reaches roughly 1,849 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 83D on an average day?
It swings with the seasons: from roughly −2,044 ft at the coldest month's average temperature to about 1,263 ft at the warmest month's — all from a constant field elevation of 624 ft. The month-by-month table above carries the full year.
What is the field elevation of Mackinac County?
624 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 83D (FAA), in St Ignace, Michigan.