Ishpeming, Michigan · field elev 1,446 ft
Density Altitude at Edward F Johnson (M61)
Edward F Johnson sits at 1,446 ft, and even a typical July afternoon (78 °F) only lifts density altitude to about 2,986 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 | 14.1 | −1,286 ft | 22.1 | −710 ft |
| February | 15.3 | −1,198 ft | 25.0 | −504 ft |
| March | 23.9 | −582 ft | 35.5 | 229 ft |
| April | 36.2 | 277 ft | 47.4 | 1,037 ft |
| May | 50.2 | 1,223 ft | 62.4 | 2,022 ft |
| June | 60.5 | 1,899 ft | 72.2 | 2,647 ft |
| July | 65.3 | 2,209 ft | 77.6 | 2,986 ft |
| August | 63.4 | 2,087 ft | 75.8 | 2,873 ft |
| September | 56.0 | 1,606 ft | 67.9 | 2,375 ft |
| October | 43.3 | 761 ft | 53.2 | 1,422 ft |
| November | 30.4 | −124 ft | 38.2 | 414 ft |
| December | 19.5 | −896 ft | 26.9 | −370 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 M61
DENSITY ALTITUDE
Field elevation 1,446 ft — the air behaves like 3,011 ft.
- PRESSURE ALT
- 1,447 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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- KIMT — Ford
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- Y73 — Stambaugh
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- 6Y9 — Prickett-Grooms Field
Sidnaw · elev 1,377 ft
- KESC — Delta County
Escanaba · elev 609 ft
- 5Y7 — Hanley Field
Munising · elev 984 ft
Frequently asked questions
How high does density altitude get at M61 in summer?
On a typical July afternoon — around 78 °F at the nearest NOAA normals station — density altitude at Edward F Johnson reaches roughly 2,986 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 M61 on an average day?
It swings with the seasons: from roughly −1,286 ft at the coldest month's average temperature to about 2,209 ft at the warmest month's — all from a constant field elevation of 1,446 ft. The month-by-month table above carries the full year.
What is the field elevation of Edward F Johnson?
1,446 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is M61 (FAA), in Ishpeming, Michigan.