Mount Joy/Marietta, Pennsylvania · field elev 458 ft
Density Altitude at Donegal Springs Airpark (N71)
Donegal Springs Airpark sits at 458 ft, and even a typical July afternoon (85 °F) only lifts density altitude to about 2,207 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 | 28.4 | −1,500 ft | 37.4 | −871 ft |
| February | 30.5 | −1,352 ft | 40.6 | −651 ft |
| March | 38.9 | −767 ft | 50.0 | −13 ft |
| April | 50.2 | 0 ft | 63.0 | 845 ft |
| May | 60.4 | 675 ft | 72.6 | 1,462 ft |
| June | 69.1 | 1,238 ft | 80.6 | 1,965 ft |
| July | 72.9 | 1,481 ft | 84.5 | 2,207 ft |
| August | 71.0 | 1,360 ft | 82.7 | 2,096 ft |
| September | 64.4 | 936 ft | 76.4 | 1,702 ft |
| October | 52.9 | 181 ft | 64.8 | 961 ft |
| November | 42.2 | −541 ft | 52.7 | 167 ft |
| December | 32.9 | −1,184 ft | 41.7 | −575 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 N71
DENSITY ALTITUDE
Field elevation 458 ft — the air behaves like 2,238 ft.
- PRESSURE ALT
- 459 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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- 0P8 — Lazy B Ranch
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- KLNS — Lancaster
Lancaster · elev 403 ft
- KCXY — Capital City
Harrisburg · elev 347 ft
- 9W8 — Chanceford
Brogue · elev 750 ft
- 08N — Keller Brothers
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- KTHV — York
York · elev 495 ft
Frequently asked questions
How high does density altitude get at N71 in summer?
On a typical July afternoon — around 85 °F at the nearest NOAA normals station — density altitude at Donegal Springs Airpark reaches roughly 2,207 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 N71 on an average day?
It swings with the seasons: from roughly −1,500 ft at the coldest month's average temperature to about 1,481 ft at the warmest month's — all from a constant field elevation of 458 ft. The month-by-month table above carries the full year.
What is the field elevation of Donegal Springs Airpark?
458 ft MSL, from the FAA NASR airport record (28-day cycle effective 2026-08-06). The identifier is N71 (FAA), in Mount Joy/Marietta, Pennsylvania.