Ionia, Michigan · field elev 818 ft
Density Altitude at Ionia County (Y70)
Ionia County sits at 818 ft, and even a typical July afternoon (81 °F) only lifts density altitude to about 2,424 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 | 22.3 | −1,483 ft | 28.9 | −1,014 ft |
| February | 24.0 | −1,362 ft | 31.6 | −825 ft |
| March | 33.3 | −706 ft | 42.3 | −87 ft |
| April | 45.2 | 110 ft | 55.6 | 805 ft |
| May | 57.4 | 923 ft | 67.9 | 1,604 ft |
| June | 67.0 | 1,546 ft | 77.3 | 2,199 ft |
| July | 70.6 | 1,776 ft | 80.9 | 2,424 ft |
| August | 68.8 | 1,661 ft | 78.9 | 2,299 ft |
| September | 61.3 | 1,178 ft | 72.0 | 1,865 ft |
| October | 49.4 | 393 ft | 59.2 | 1,041 ft |
| November | 37.9 | −388 ft | 45.5 | 130 ft |
| December | 28.0 | −1,078 ft | 33.9 | −665 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 Y70
DENSITY ALTITUDE
Field elevation 818 ft — the air behaves like 2,430 ft.
- PRESSURE ALT
- 819 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
- C43 — Hiram Cure
Sunfield · elev 853 ft
- 56C — Boulder Canyon
Belding · elev 823 ft
- 24C — Lowell City
Lowell · elev 681 ft
- 6D6 — Greenville Municipal
Greenville · elev 855 ft
- 3F5 — Forest Hill
Westphalia · elev 772 ft
- 4D0 — Abrams Municipal
Grand Ledge · elev 841 ft
- 51C — Orban
Dewitt · elev 882 ft
- KGRR — Gerald R Ford International
Grand Rapids · elev 794 ft
Frequently asked questions
How high does density altitude get at Y70 in summer?
On a typical July afternoon — around 81 °F at the nearest NOAA normals station — density altitude at Ionia County reaches roughly 2,424 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 Y70 on an average day?
It swings with the seasons: from roughly −1,483 ft at the coldest month's average temperature to about 1,776 ft at the warmest month's — all from a constant field elevation of 818 ft. The month-by-month table above carries the full year.
What is the field elevation of Ionia County?
818 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is Y70 (FAA), in Ionia, Michigan.