St Johns, Michigan · field elev 775 ft
Density Altitude at Glowacki (97G)
Glowacki sits at 775 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,514 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 | 24.2 | −1,401 ft | 30.6 | −949 ft |
| February | 25.8 | −1,287 ft | 33.0 | −781 ft |
| March | 34.9 | −649 ft | 43.7 | −45 ft |
| April | 46.6 | 151 ft | 56.9 | 837 ft |
| May | 58.8 | 962 ft | 69.3 | 1,640 ft |
| June | 68.8 | 1,608 ft | 78.9 | 2,247 ft |
| July | 72.8 | 1,863 ft | 83.2 | 2,514 ft |
| August | 71.0 | 1,749 ft | 81.3 | 2,396 ft |
| September | 63.9 | 1,293 ft | 74.8 | 1,989 ft |
| October | 52.2 | 526 ft | 61.7 | 1,151 ft |
| November | 40.0 | −297 ft | 47.3 | 198 ft |
| December | 30.0 | −991 ft | 36.0 | −573 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 97G
DENSITY ALTITUDE
Field elevation 775 ft — the air behaves like 2,501 ft.
- PRESSURE ALT
- 776 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
- M99 — Shady Lane
St Johns · elev 680 ft
- 39T — Tripp Creek
St Johns · elev 717 ft
- 3F5 — Forest Hill
Westphalia · elev 772 ft
- 3S5 — Schiffer Acres
St Johns · elev 741 ft
- 51C — Orban
Dewitt · elev 882 ft
- 41G — University Airpark
Bath · elev 856 ft
- 4M4 — Shady Lawn Field
Bannister · elev 683 ft
- C57 — Millers Landing
Elsie · elev 757 ft
Frequently asked questions
How high does density altitude get at 97G in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Glowacki reaches roughly 2,514 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 97G on an average day?
It swings with the seasons: from roughly −1,401 ft at the coldest month's average temperature to about 1,863 ft at the warmest month's — all from a constant field elevation of 775 ft. The month-by-month table above carries the full year.
What is the field elevation of Glowacki?
775 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 97G (FAA), in St Johns, Michigan.