St Helen, Michigan · field elev 1,198 ft
Density Altitude at St Helen (6Y6)
St Helen sits at 1,198 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,863 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 | 19.1 | −1,236 ft | 26.9 | −680 ft |
| February | 20.3 | −1,149 ft | 29.6 | −490 ft |
| March | 29.7 | −483 ft | 40.4 | 256 ft |
| April | 42.2 | 379 ft | 53.8 | 1,155 ft |
| May | 54.7 | 1,215 ft | 67.2 | 2,026 ft |
| June | 63.9 | 1,814 ft | 76.7 | 2,626 ft |
| July | 67.8 | 2,064 ft | 80.5 | 2,863 ft |
| August | 65.8 | 1,936 ft | 78.3 | 2,726 ft |
| September | 58.3 | 1,451 ft | 70.6 | 2,242 ft |
| October | 46.8 | 689 ft | 56.8 | 1,353 ft |
| November | 35.5 | −80 ft | 43.1 | 440 ft |
| December | 25.6 | −772 ft | 32.1 | −316 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 6Y6
DENSITY ALTITUDE
Field elevation 1,198 ft — the air behaves like 2,894 ft.
- PRESSURE ALT
- 1,199 ft
- ISA DEVIATION
- —
- RULE-OF-THUMB DA
- —
- AIR DENSITY INDEX
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- AIR DENSITY
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- WATER · GRAINS/LB
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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
- 3RC — Roscommon Conservation
Roscommon · elev 1,157 ft
- KHTL — Roscommon County/Blodgett Meml
Houghton Lake · elev 1,150 ft
- Y31 — West Branch Community
West Branch · elev 882 ft
- 5M6 — Sugar Springs Airpark
Gladwin · elev 953 ft
- 5Y2 — Houghton Lake State
Houghton Lake Heights · elev 1,165 ft
- 51M — Oscoda County/Dennis Kauffman Meml
Mio · elev 1,033 ft
- KGOV — Grayling Aaf
Grayling · elev 1,158 ft
- KGDW — Gladwin Zettel Meml
Gladwin · elev 774 ft
Frequently asked questions
How high does density altitude get at 6Y6 in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at St Helen reaches roughly 2,863 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 6Y6 on an average day?
It swings with the seasons: from roughly −1,236 ft at the coldest month's average temperature to about 2,064 ft at the warmest month's — all from a constant field elevation of 1,198 ft. The month-by-month table above carries the full year.
What is the field elevation of St Helen?
1,198 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 6Y6 (FAA), in St Helen, Michigan.