St Johns, Michigan · field elev 741 ft
Density Altitude at Schiffer Acres (3S5)
Schiffer Acres sits at 741 ft, and even a typical July afternoon (83 °F) only lifts density altitude to about 2,472 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 | −1,444 ft | 30.6 | −991 ft |
| February | 25.8 | −1,330 ft | 33.0 | −823 ft |
| March | 34.9 | −691 ft | 43.7 | −87 ft |
| April | 46.6 | 109 ft | 56.9 | 795 ft |
| May | 58.8 | 920 ft | 69.3 | 1,599 ft |
| June | 68.8 | 1,567 ft | 78.9 | 2,205 ft |
| July | 72.8 | 1,821 ft | 83.2 | 2,472 ft |
| August | 71.0 | 1,707 ft | 81.3 | 2,355 ft |
| September | 63.9 | 1,252 ft | 74.8 | 1,948 ft |
| October | 52.2 | 484 ft | 61.7 | 1,109 ft |
| November | 40.0 | −339 ft | 47.3 | 156 ft |
| December | 30.0 | −1,033 ft | 36.0 | −615 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 3S5
DENSITY ALTITUDE
Field elevation 741 ft — the air behaves like 2,460 ft.
- PRESSURE ALT
- 742 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
- 39T — Tripp Creek
St Johns · elev 717 ft
- C57 — Millers Landing
Elsie · elev 757 ft
- M99 — Shady Lane
St Johns · elev 680 ft
- 4M4 — Shady Lawn Field
Bannister · elev 683 ft
- 97G — Glowacki
St Johns · elev 775 ft
- C88 — Tkaczyk Field
Oakley · elev 727 ft
- 41G — University Airpark
Bath · elev 856 ft
- 3F5 — Forest Hill
Westphalia · elev 772 ft
Frequently asked questions
How high does density altitude get at 3S5 in summer?
On a typical July afternoon — around 83 °F at the nearest NOAA normals station — density altitude at Schiffer Acres reaches roughly 2,472 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 3S5 on an average day?
It swings with the seasons: from roughly −1,444 ft at the coldest month's average temperature to about 1,821 ft at the warmest month's — all from a constant field elevation of 741 ft. The month-by-month table above carries the full year.
What is the field elevation of Schiffer Acres?
741 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 3S5 (FAA), in St Johns, Michigan.