Plainwell, Michigan · field elev 722 ft
Density Altitude at Virgil L Williams Plainwell Municipal (61D)
Virgil L Williams Plainwell Municipal sits at 722 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,362 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 | 22.9 | −1,561 ft | 30.2 | −1,043 ft |
| February | 24.4 | −1,453 ft | 32.8 | −861 ft |
| March | 33.7 | −798 ft | 43.4 | −131 ft |
| April | 45.9 | 38 ft | 57.5 | 811 ft |
| May | 56.8 | 765 ft | 68.3 | 1,511 ft |
| June | 66.7 | 1,409 ft | 77.9 | 2,119 ft |
| July | 69.8 | 1,607 ft | 81.8 | 2,362 ft |
| August | 68.9 | 1,550 ft | 80.1 | 2,257 ft |
| September | 61.6 | 1,079 ft | 73.2 | 1,823 ft |
| October | 50.5 | 347 ft | 60.9 | 1,033 ft |
| November | 38.9 | −439 ft | 46.9 | 106 ft |
| December | 28.7 | −1,149 ft | 35.1 | −701 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 61D
DENSITY ALTITUDE
Field elevation 722 ft — the air behaves like 2,375 ft.
- PRESSURE ALT
- 723 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
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- 9D9 — Hastings
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- KBTL — Battle Creek Exec At Kellogg Field
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- M86 — Walle Field
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Frequently asked questions
How high does density altitude get at 61D in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Virgil L Williams Plainwell Municipal reaches roughly 2,362 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 61D on an average day?
It swings with the seasons: from roughly −1,561 ft at the coldest month's average temperature to about 1,607 ft at the warmest month's — all from a constant field elevation of 722 ft. The month-by-month table above carries the full year.
What is the field elevation of Virgil L Williams Plainwell Municipal?
722 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is 61D (FAA), in Plainwell, Michigan.