Ontonagon, Michigan · field elev 665 ft
Density Altitude at Ontonagon County/Schuster Field (KOGM)
Ontonagon County/Schuster Field sits at 665 ft, and even a typical July afternoon (79 °F) only lifts density altitude to about 2,131 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 | 17.0 | −2,058 ft | 25.1 | −1,475 ft |
| February | 19.3 | −1,891 ft | 29.9 | −1,135 ft |
| March | 29.1 | −1,192 ft | 40.4 | −407 ft |
| April | 41.0 | −366 ft | 52.1 | 383 ft |
| May | 53.6 | 483 ft | 66.0 | 1,294 ft |
| June | 62.7 | 1,080 ft | 75.4 | 1,892 ft |
| July | 67.2 | 1,371 ft | 79.2 | 2,131 ft |
| August | 66.1 | 1,300 ft | 78.4 | 2,081 ft |
| September | 59.4 | 865 ft | 70.5 | 1,582 ft |
| October | 47.0 | 42 ft | 56.3 | 662 ft |
| November | 34.0 | −849 ft | 41.2 | −352 ft |
| December | 23.1 | −1,618 ft | 29.9 | −1,135 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 KOGM
DENSITY ALTITUDE
Field elevation 665 ft — the air behaves like 2,118 ft.
- PRESSURE ALT
- 666 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- 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
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Ironwood · elev 1,230 ft
- KCMX — Houghton County Meml
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- Y73 — Stambaugh
Iron River · elev 1,618 ft
- 50D — Iron County
Crystal Falls · elev 1,340 ft
- M61 — Edward F Johnson
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- KIMT — Ford
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- KSAW — Marquette/Sawyer Regional
Marquette · elev 1,205 ft
Frequently asked questions
How high does density altitude get at KOGM in summer?
On a typical July afternoon — around 79 °F at the nearest NOAA normals station — density altitude at Ontonagon County/Schuster Field reaches roughly 2,131 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 KOGM on an average day?
It swings with the seasons: from roughly −2,058 ft at the coldest month's average temperature to about 1,371 ft at the warmest month's — all from a constant field elevation of 665 ft. The month-by-month table above carries the full year.
What is the field elevation of Ontonagon County/Schuster Field?
665 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is KOGM (ICAO) / OGM (FAA), in Ontonagon, Michigan.