Grand Marais, Michigan · field elev 838 ft
Density Altitude at Grand Marais (Y98)
Grand Marais sits at 838 ft, and even a typical August afternoon (75 °F) only lifts density altitude to about 2,079 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 | 18.9 | −1,702 ft | 24.3 | −1,315 ft |
| February | 20.1 | −1,616 ft | 26.8 | −1,138 ft |
| March | 28.2 | −1,039 ft | 36.5 | −459 ft |
| April | 37.9 | −363 ft | 47.5 | 290 ft |
| May | 50.3 | 478 ft | 60.9 | 1,176 ft |
| June | 59.1 | 1,059 ft | 69.9 | 1,756 ft |
| July | 64.5 | 1,410 ft | 74.5 | 2,048 ft |
| August | 65.4 | 1,468 ft | 75.0 | 2,079 ft |
| September | 59.1 | 1,059 ft | 68.0 | 1,635 ft |
| October | 47.0 | 256 ft | 54.6 | 763 ft |
| November | 34.9 | −570 ft | 40.7 | −171 ft |
| December | 25.2 | −1,251 ft | 30.5 | −877 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 Y98
DENSITY ALTITUDE
Field elevation 838 ft — the air behaves like 2,079 ft.
- PRESSURE ALT
- 839 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
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Marquette · elev 1,205 ft
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Frequently asked questions
How high does density altitude get at Y98 in summer?
On a typical August afternoon — around 75 °F at the nearest NOAA normals station — density altitude at Grand Marais reaches roughly 2,079 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 Y98 on an average day?
It swings with the seasons: from roughly −1,702 ft at the coldest month's average temperature to about 1,468 ft at the warmest month's — all from a constant field elevation of 838 ft. The month-by-month table above carries the full year.
What is the field elevation of Grand Marais?
838 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is Y98 (FAA), in Grand Marais, Michigan.