Sidnaw, Michigan · field elev 1,377 ft
Density Altitude at Prickett-Grooms Field (6Y9)
Prickett-Grooms Field sits at 1,377 ft, and even a typical July afternoon (76 °F) only lifts density altitude to about 2,783 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 | 13.9 | −1,387 ft | 21.9 | −810 ft |
| February | 16.1 | −1,227 ft | 25.3 | −569 ft |
| March | 25.4 | −562 ft | 36.8 | 233 ft |
| April | 37.9 | 308 ft | 49.1 | 1,065 ft |
| May | 51.4 | 1,218 ft | 63.7 | 2,021 ft |
| June | 60.5 | 1,814 ft | 72.0 | 2,550 ft |
| July | 64.4 | 2,066 ft | 75.7 | 2,783 ft |
| August | 63.3 | 1,995 ft | 74.4 | 2,701 ft |
| September | 56.1 | 1,528 ft | 66.9 | 2,226 ft |
| October | 43.7 | 703 ft | 53.1 | 1,330 ft |
| November | 31.4 | −141 ft | 38.4 | 342 ft |
| December | 20.0 | −946 ft | 27.4 | −421 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 6Y9
DENSITY ALTITUDE
Field elevation 1,377 ft — the air behaves like 2,801 ft.
- PRESSURE ALT
- 1,378 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
- Y73 — Stambaugh
Iron River · elev 1,618 ft
- KOGM — Ontonagon County/Schuster Field
Ontonagon · elev 665 ft
- 50D — Iron County
Crystal Falls · elev 1,340 ft
- M61 — Edward F Johnson
Ishpeming · elev 1,446 ft
- KCMX — Houghton County Meml
Hancock · elev 1,095 ft
- KIMT — Ford
Iron Mountain Kingsford · elev 1,182 ft
- KSAW — Marquette/Sawyer Regional
Marquette · elev 1,205 ft
- KIWD — Gogebic/Iron County
Ironwood · elev 1,230 ft
Frequently asked questions
How high does density altitude get at 6Y9 in summer?
On a typical July afternoon — around 76 °F at the nearest NOAA normals station — density altitude at Prickett-Grooms Field reaches roughly 2,783 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 6Y9 on an average day?
It swings with the seasons: from roughly −1,387 ft at the coldest month's average temperature to about 2,066 ft at the warmest month's — all from a constant field elevation of 1,377 ft. The month-by-month table above carries the full year.
What is the field elevation of Prickett-Grooms Field?
1,377 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 6Y9 (FAA), in Sidnaw, Michigan.