Germansville, Pennsylvania · field elev 735 ft
Density Altitude at Flying M Aerodrome (P91)
Flying M Aerodrome sits at 735 ft, and even a typical July afternoon (82 °F) only lifts density altitude to about 2,372 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 | 27.2 | −1,238 ft | 35.6 | −650 ft |
| February | 29.5 | −1,076 ft | 38.4 | −457 ft |
| March | 37.5 | −519 ft | 47.2 | 142 ft |
| April | 49.5 | 297 ft | 60.9 | 1,049 ft |
| May | 59.4 | 952 ft | 70.5 | 1,668 ft |
| June | 67.4 | 1,470 ft | 77.6 | 2,116 ft |
| July | 72.1 | 1,770 ft | 81.7 | 2,372 ft |
| August | 69.9 | 1,630 ft | 79.8 | 2,254 ft |
| September | 63.0 | 1,186 ft | 73.3 | 1,846 ft |
| October | 51.4 | 423 ft | 61.6 | 1,095 ft |
| November | 40.9 | −285 ft | 50.1 | 337 ft |
| December | 32.1 | −894 ft | 39.8 | −361 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 P91
DENSITY ALTITUDE
Field elevation 735 ft — the air behaves like 2,391 ft.
- PRESSURE ALT
- 736 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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- KABE — Lehigh Valley International
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- KXLL — Allentown Queen City Municipal
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- KHZL — Hazleton Regional
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- 7N8 — Butter Valley Golf Port
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Frequently asked questions
How high does density altitude get at P91 in summer?
On a typical July afternoon — around 82 °F at the nearest NOAA normals station — density altitude at Flying M Aerodrome reaches roughly 2,372 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 P91 on an average day?
It swings with the seasons: from roughly −1,238 ft at the coldest month's average temperature to about 1,770 ft at the warmest month's — all from a constant field elevation of 735 ft. The month-by-month table above carries the full year.
What is the field elevation of Flying M Aerodrome?
735 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is P91 (FAA), in Germansville, Pennsylvania.